diff --git a/libraries/src/Application/WebApplication.php b/libraries/src/Application/WebApplication.php
index c1099afc01d09..bbe24c82d2d5e 100644
--- a/libraries/src/Application/WebApplication.php
+++ b/libraries/src/Application/WebApplication.php
@@ -408,7 +408,7 @@ protected function loadSystemUris($requestUri = null)
             $uri = Uri::getInstance($this->get('uri.request'));
 
             // If we are working from a CGI SAPI with the 'cgi.fix_pathinfo' directive disabled we use PHP_SELF.
-            if (strpos(PHP_SAPI, 'cgi') !== false && !\ini_get('cgi.fix_pathinfo') && !empty($_SERVER['REQUEST_URI'])) {
+            if (str_contains(PHP_SAPI, 'cgi') && !\ini_get('cgi.fix_pathinfo') && !empty($_SERVER['REQUEST_URI'])) {
                 // We aren't expecting PATH_INFO within PHP_SELF so this should work.
                 $path = \dirname($_SERVER['PHP_SELF']);
             } else {
@@ -420,7 +420,7 @@ protected function loadSystemUris($requestUri = null)
         $host = $uri->toString(['scheme', 'user', 'pass', 'host', 'port']);
 
         // Check if the path includes "index.php".
-        if (strpos($path, 'index.php') !== false) {
+        if (str_contains($path, 'index.php')) {
             // Remove the index.php portion of the path.
             $path = substr_replace($path, '', strpos($path, 'index.php'), 9);
         }
@@ -441,7 +441,7 @@ protected function loadSystemUris($requestUri = null)
         $mediaURI = trim($this->get('media_uri', ''));
 
         if ($mediaURI) {
-            if (strpos($mediaURI, '://') !== false) {
+            if (str_contains($mediaURI, '://')) {
                 $this->set('uri.media.full', $mediaURI);
                 $this->set('uri.media.path', $mediaURI);
             } else {
diff --git a/libraries/src/Authentication/Password/MD5Handler.php b/libraries/src/Authentication/Password/MD5Handler.php
index ff600cd0cc6b0..8719b5a719675 100644
--- a/libraries/src/Authentication/Password/MD5Handler.php
+++ b/libraries/src/Authentication/Password/MD5Handler.php
@@ -89,7 +89,7 @@ public function validatePassword($plaintext, $hashed)
 
         // Compile the hash to compare
         // If the salt is empty AND there is a ':' in the original hash, we must append ':' at the end
-        $testcrypt = md5($plaintext . $salt) . ($salt ? ':' . $salt : (strpos($hashed, ':') !== false ? ':' : ''));
+        $testcrypt = md5($plaintext . $salt) . ($salt ? ':' . $salt : (str_contains($hashed, ':') ? ':' : ''));
 
         return Crypt::timingSafeCompare($hashed, $testcrypt);
     }
diff --git a/libraries/src/Client/FtpClient.php b/libraries/src/Client/FtpClient.php
index 5adb2992b7906..fb94d9b95f269 100644
--- a/libraries/src/Client/FtpClient.php
+++ b/libraries/src/Client/FtpClient.php
@@ -479,9 +479,9 @@ public function syst()
         }
 
         // Match the system string to an OS
-        if (strpos(strtoupper($ret), 'MAC') !== false) {
+        if (str_contains(strtoupper($ret), 'MAC')) {
             $ret = 'MAC';
-        } elseif (strpos(strtoupper($ret), 'WIN') !== false) {
+        } elseif (str_contains(strtoupper($ret), 'WIN')) {
             $ret = 'WIN';
         } else {
             $ret = 'UNIX';
diff --git a/libraries/src/Console/SetConfigurationCommand.php b/libraries/src/Console/SetConfigurationCommand.php
index 8692a185f8ec2..b0651581f24f9 100644
--- a/libraries/src/Console/SetConfigurationCommand.php
+++ b/libraries/src/Console/SetConfigurationCommand.php
@@ -127,7 +127,7 @@ private function retrieveOptionsFromInput(array $options): bool
         $collected = [];
 
         foreach ($options as $option) {
-            if (strpos($option, '=') === false) {
+            if (!str_contains($option, '=')) {
                 $this->ioStyle->error('Options and values should be separated by "="');
 
                 return false;
diff --git a/libraries/src/Date/Date.php b/libraries/src/Date/Date.php
index 599439e584a91..ac1321467eeae 100644
--- a/libraries/src/Date/Date.php
+++ b/libraries/src/Date/Date.php
@@ -312,19 +312,19 @@ public function format($format, $local = false, $translate = true): string
 
         if ($translate) {
             // Manually modify the month and day strings in the formatted time.
-            if (strpos($return, self::DAY_ABBR) !== false) {
+            if (str_contains($return, self::DAY_ABBR)) {
                 $return = str_replace(self::DAY_ABBR, $this->dayToString(parent::format('w'), true), $return);
             }
 
-            if (strpos($return, self::DAY_NAME) !== false) {
+            if (str_contains($return, self::DAY_NAME)) {
                 $return = str_replace(self::DAY_NAME, $this->dayToString(parent::format('w')), $return);
             }
 
-            if (strpos($return, self::MONTH_ABBR) !== false) {
+            if (str_contains($return, self::MONTH_ABBR)) {
                 $return = str_replace(self::MONTH_ABBR, $this->monthToString(parent::format('n'), true), $return);
             }
 
-            if (strpos($return, self::MONTH_NAME) !== false) {
+            if (str_contains($return, self::MONTH_NAME)) {
                 $return = str_replace(self::MONTH_NAME, $this->monthToString(parent::format('n')), $return);
             }
         }
diff --git a/libraries/src/Dispatcher/ComponentDispatcher.php b/libraries/src/Dispatcher/ComponentDispatcher.php
index 6e61347d931a4..d36849d7a6f87 100644
--- a/libraries/src/Dispatcher/ComponentDispatcher.php
+++ b/libraries/src/Dispatcher/ComponentDispatcher.php
@@ -118,7 +118,7 @@ public function dispatch()
         $command = $this->input->getCmd('task', 'display');
 
         // Check for a controller.task command.
-        if (strpos($command, '.') !== false) {
+        if (str_contains($command, '.')) {
             // Explode the controller.task command.
             list($controller, $task) = explode('.', $command);
 
diff --git a/libraries/src/Document/Renderer/Feed/RssRenderer.php b/libraries/src/Document/Renderer/Feed/RssRenderer.php
index 5522faec5b00a..7b112772794e5 100644
--- a/libraries/src/Document/Renderer/Feed/RssRenderer.php
+++ b/libraries/src/Document/Renderer/Feed/RssRenderer.php
@@ -173,7 +173,7 @@ public function render($name = '', $params = null, $content = null)
                 $itemlink = implode('/', array_map('rawurlencode', explode('/', $itemlink)));
             }
 
-            if ((strpos($itemlink, 'http://') === false) && (strpos($itemlink, 'https://') === false)) {
+            if ((!str_contains($itemlink, 'http://')) && (!str_contains($itemlink, 'https://'))) {
                 $itemlink = str_replace(' ', '%20', $url . $itemlink);
             }
 
diff --git a/libraries/src/Document/Renderer/Html/ScriptsRenderer.php b/libraries/src/Document/Renderer/Html/ScriptsRenderer.php
index e329fcf62c3e4..b1819c578dec8 100644
--- a/libraries/src/Document/Renderer/Html/ScriptsRenderer.php
+++ b/libraries/src/Document/Renderer/Html/ScriptsRenderer.php
@@ -185,7 +185,7 @@ private function renderElement($item): string
         $this->renderedSrc[$src] = true;
 
         // Check if script uses media version.
-        if ($version && strpos($src, '?') === false && ($mediaVersion || $version !== 'auto')) {
+        if ($version && !str_contains($src, '?') && ($mediaVersion || $version !== 'auto')) {
             $src .= '?' . ($version === 'auto' ? $mediaVersion : $version);
         }
 
diff --git a/libraries/src/Document/Renderer/Html/StylesRenderer.php b/libraries/src/Document/Renderer/Html/StylesRenderer.php
index ccf55920e2a1e..45a6aa39a7a4d 100644
--- a/libraries/src/Document/Renderer/Html/StylesRenderer.php
+++ b/libraries/src/Document/Renderer/Html/StylesRenderer.php
@@ -174,7 +174,7 @@ private function renderElement($item): string
         $this->renderedSrc[$src] = true;
 
         // Check if script uses media version.
-        if ($version && strpos($src, '?') === false && ($mediaVersion || $version !== 'auto')) {
+        if ($version && !str_contains($src, '?') && ($mediaVersion || $version !== 'auto')) {
             $src .= '?' . ($version === 'auto' ? $mediaVersion : $version);
         }
 
diff --git a/libraries/src/Environment/Browser.php b/libraries/src/Environment/Browser.php
index 782dad6af8a60..29133799bbf84 100644
--- a/libraries/src/Environment/Browser.php
+++ b/libraries/src/Environment/Browser.php
@@ -543,8 +543,8 @@ public function match($userAgent = null, $accept = null)
              * user agent string, which we can use to look for mobile agents.
              */
             if (
-                strpos($this->agent, 'MOT-') !== false
-                || strpos($this->lowerAgent, 'j-') !== false
+                str_contains($this->agent, 'MOT-')
+                || str_contains($this->lowerAgent, 'j-')
                 || preg_match('/(mobileexplorer|openwave|opera mini|opera mobi|operamini|avantgo|wap|elaine)/i', $this->agent)
                 || preg_match('/(iPhone|iPod|iPad|Android|Mobile|Phone|BlackBerry|Xiino|Palmscape|palmsource)/i', $this->agent)
                 || preg_match('/(Nokia|Ericsson|docomo|digital paths|portalmmm|CriOS[\/ ]([0-9.]+))/i', $this->agent)
@@ -561,7 +561,7 @@ public function match($userAgent = null, $accept = null)
             if (preg_match('|Edge\/([0-9.]+)|', $this->agent, $version)) {
                 $this->setBrowser('edge');
 
-                if (strpos($version[1], '.') !== false) {
+                if (str_contains($version[1], '.')) {
                     list($this->majorVersion, $this->minorVersion) = explode('.', $version[1]);
                 } else {
                     $this->majorVersion = $version[1];
@@ -601,9 +601,9 @@ public function match($userAgent = null, $accept = null)
 
                 list($this->majorVersion, $this->minorVersion) = explode('.', $version[1]);
             } elseif (
-                strpos($this->lowerAgent, 'elaine/') !== false
-                || strpos($this->lowerAgent, 'palmsource') !== false
-                || strpos($this->lowerAgent, 'digital paths') !== false
+                str_contains($this->lowerAgent, 'elaine/')
+                || str_contains($this->lowerAgent, 'palmsource')
+                || str_contains($this->lowerAgent, 'digital paths')
             ) {
                 $this->setBrowser('palm');
             } elseif (
@@ -615,11 +615,11 @@ public function match($userAgent = null, $accept = null)
                 $this->setBrowser('msie');
 
                 // Special case for IE 11+
-                if (strpos($version[0], 'Trident') !== false && strpos($version[0], 'rv:') !== false) {
+                if (str_contains($version[0], 'Trident') && str_contains($version[0], 'rv:')) {
                     preg_match('|rv:([0-9.]+)|', $this->agent, $version);
                 }
 
-                if (strpos($version[1], '.') !== false) {
+                if (str_contains($version[1], '.')) {
                     list($this->majorVersion, $this->minorVersion) = explode('.', $version[1]);
                 } else {
                     $this->majorVersion = $version[1];
@@ -634,7 +634,7 @@ public function match($userAgent = null, $accept = null)
                 }
             } elseif (preg_match('|ANTFresco\/([0-9]+)|', $this->agent, $version)) {
                 $this->setBrowser('fresco');
-            } elseif (strpos($this->lowerAgent, 'avantgo') !== false) {
+            } elseif (str_contains($this->lowerAgent, 'avantgo')) {
                 $this->setBrowser('avantgo');
             } elseif (preg_match('|[Kk]onqueror\/([0-9]+)|', $this->agent, $version) || preg_match('|Safari/([0-9]+)\.?([0-9]+)?|', $this->agent, $version)) {
                 // Konqueror and Apple's Safari both use the KHTML rendering engine.
@@ -645,7 +645,7 @@ public function match($userAgent = null, $accept = null)
                     $this->minorVersion = $version[2];
                 }
 
-                if (strpos($this->agent, 'Safari') !== false && $this->majorVersion >= 60) {
+                if (str_contains($this->agent, 'Safari') && $this->majorVersion >= 60) {
                     // Safari.
                     $this->setBrowser('safari');
                     $this->identifyBrowserVersion();
@@ -660,25 +660,25 @@ public function match($userAgent = null, $accept = null)
                 $this->setBrowser('links');
             } elseif (preg_match('|HotJava\/([0-9]+)|', $this->agent, $version)) {
                 $this->setBrowser('hotjava');
-            } elseif (strpos($this->agent, 'UP/') !== false || strpos($this->agent, 'UP.B') !== false || strpos($this->agent, 'UP.L') !== false) {
+            } elseif (str_contains($this->agent, 'UP/') || str_contains($this->agent, 'UP.B') || str_contains($this->agent, 'UP.L')) {
                 $this->setBrowser('up');
-            } elseif (strpos($this->agent, 'Xiino/') !== false) {
+            } elseif (str_contains($this->agent, 'Xiino/')) {
                 $this->setBrowser('xiino');
-            } elseif (strpos($this->agent, 'Palmscape/') !== false) {
+            } elseif (str_contains($this->agent, 'Palmscape/')) {
                 $this->setBrowser('palmscape');
-            } elseif (strpos($this->agent, 'Nokia') !== false) {
+            } elseif (str_contains($this->agent, 'Nokia')) {
                 $this->setBrowser('nokia');
-            } elseif (strpos($this->agent, 'Ericsson') !== false) {
+            } elseif (str_contains($this->agent, 'Ericsson')) {
                 $this->setBrowser('ericsson');
-            } elseif (strpos($this->lowerAgent, 'wap') !== false) {
+            } elseif (str_contains($this->lowerAgent, 'wap')) {
                 $this->setBrowser('wap');
-            } elseif (strpos($this->lowerAgent, 'docomo') !== false || strpos($this->lowerAgent, 'portalmmm') !== false) {
+            } elseif (str_contains($this->lowerAgent, 'docomo') || str_contains($this->lowerAgent, 'portalmmm')) {
                 $this->setBrowser('imode');
-            } elseif (strpos($this->agent, 'BlackBerry') !== false) {
+            } elseif (str_contains($this->agent, 'BlackBerry')) {
                 $this->setBrowser('blackberry');
-            } elseif (strpos($this->agent, 'MOT-') !== false) {
+            } elseif (str_contains($this->agent, 'MOT-')) {
                 $this->setBrowser('motorola');
-            } elseif (strpos($this->lowerAgent, 'j-') !== false) {
+            } elseif (str_contains($this->lowerAgent, 'j-')) {
                 $this->setBrowser('mml');
             } elseif (preg_match('|Mozilla\/([0-9.]+)|', $this->agent, $version)) {
                 $this->setBrowser('mozilla');
@@ -701,9 +701,9 @@ public function match($userAgent = null, $accept = null)
      */
     protected function _setPlatform()
     {
-        if (strpos($this->lowerAgent, 'wind') !== false) {
+        if (str_contains($this->lowerAgent, 'wind')) {
             $this->platform = 'win';
-        } elseif (strpos($this->lowerAgent, 'mac') !== false) {
+        } elseif (str_contains($this->lowerAgent, 'mac')) {
             $this->platform = 'mac';
         } else {
             $this->platform = 'unix';
@@ -854,11 +854,11 @@ public function isViewable($mimetype)
         if (!empty($this->accept)) {
             $wildcard_match = false;
 
-            if (strpos($this->accept, $mimetype) !== false) {
+            if (str_contains($this->accept, $mimetype)) {
                 return true;
             }
 
-            if (strpos($this->accept, '*/*') !== false) {
+            if (str_contains($this->accept, '*/*')) {
                 $wildcard_match = true;
 
                 if ($type !== 'image') {
@@ -867,7 +867,7 @@ public function isViewable($mimetype)
             }
 
             // Deal with Mozilla pjpeg/jpeg issue
-            if ($this->isBrowser('mozilla') && ($mimetype === 'image/pjpeg') && (strpos($this->accept, 'image/jpeg') !== false)) {
+            if ($this->isBrowser('mozilla') && ($mimetype === 'image/pjpeg') && (str_contains($this->accept, 'image/jpeg'))) {
                 return true;
             }
 
diff --git a/libraries/src/Event/View/DisplayEvent.php b/libraries/src/Event/View/DisplayEvent.php
index c7eb61068a079..4b33287928549 100644
--- a/libraries/src/Event/View/DisplayEvent.php
+++ b/libraries/src/Event/View/DisplayEvent.php
@@ -51,7 +51,7 @@ public function __construct($name, array $arguments = [])
             throw new \BadMethodCallException("Argument 'extension' of event {$this->name} is not of type 'string'");
         }
 
-        if (strpos($arguments['extension'], '.') === false) {
+        if (!str_contains($arguments['extension'], '.')) {
             throw new \BadMethodCallException("Argument 'extension' of event {$this->name} has wrong format. Valid format: 'component.section'");
         }
 
diff --git a/libraries/src/Event/Workflow/AbstractEvent.php b/libraries/src/Event/Workflow/AbstractEvent.php
index b020487ae3c4f..106e1582d355a 100644
--- a/libraries/src/Event/Workflow/AbstractEvent.php
+++ b/libraries/src/Event/Workflow/AbstractEvent.php
@@ -42,7 +42,7 @@ public function __construct($name, array $arguments = [])
             throw new \BadMethodCallException("Argument 'extension' of event {$this->name} is required but has not been provided");
         }
 
-        if (strpos($arguments['extension'], '.') === false) {
+        if (!str_contains($arguments['extension'], '.')) {
             throw new \BadMethodCallException("Argument 'extension' of event {$this->name} has wrong format. Valid format: 'component.section'");
         }
 
diff --git a/libraries/src/Filesystem/File.php b/libraries/src/Filesystem/File.php
index 020d7506d6a28..627c4c2ec97cd 100644
--- a/libraries/src/Filesystem/File.php
+++ b/libraries/src/Filesystem/File.php
@@ -56,7 +56,7 @@ public static function getExt($file)
         $ext = substr($file, $dot + 1);
 
         // Extension cannot contain slashes.
-        if (strpos($ext, '/') !== false || (DIRECTORY_SEPARATOR === '\\' && strpos($ext, '\\') !== false)) {
+        if (str_contains($ext, '/') || (DIRECTORY_SEPARATOR === '\\' && str_contains($ext, '\\'))) {
             return '';
         }
 
diff --git a/libraries/src/Form/Field/CaptchaField.php b/libraries/src/Form/Field/CaptchaField.php
index bcfb6f6b96a15..b24514b312372 100644
--- a/libraries/src/Form/Field/CaptchaField.php
+++ b/libraries/src/Form/Field/CaptchaField.php
@@ -139,7 +139,7 @@ public function setup(\SimpleXMLElement $element, $value, $group = null)
         // Obs: Don't put required="required" in the xml file, you just need to have validate="captcha"
         $this->required = true;
 
-        if (strpos($this->class, 'required') === false) {
+        if (!str_contains($this->class, 'required')) {
             $this->class .= ' required';
         }
 
diff --git a/libraries/src/Form/Field/MediaField.php b/libraries/src/Form/Field/MediaField.php
index 73004903c7b6f..4fe134ae6f87f 100644
--- a/libraries/src/Form/Field/MediaField.php
+++ b/libraries/src/Form/Field/MediaField.php
@@ -274,7 +274,7 @@ public function getLayoutData()
         }
 
         // Value in new format such as images/headers/blue-flower.jpg#joomlaImage://local-images/headers/blue-flower.jpg?width=700&height=180
-        if ($this->value && strpos($this->value, '#') !== false) {
+        if ($this->value && str_contains($this->value, '#')) {
             $uri     = new Uri(explode('#', $this->value)[1]);
             $adapter = $uri->getHost();
             $path    = $uri->getPath();
diff --git a/libraries/src/Form/Field/TagField.php b/libraries/src/Form/Field/TagField.php
index e81b268d5678a..6d0eadd76e196 100644
--- a/libraries/src/Form/Field/TagField.php
+++ b/libraries/src/Form/Field/TagField.php
@@ -153,7 +153,7 @@ protected function getOptions()
             }
         } elseif (!empty($this->element['language'])) {
             // Filter language
-            if (strpos($this->element['language'], ',') !== false) {
+            if (str_contains($this->element['language'], ',')) {
                 $language = explode(',', $this->element['language']);
             } else {
                 $language = [$this->element['language']];
diff --git a/libraries/src/Form/Field/TimezoneField.php b/libraries/src/Form/Field/TimezoneField.php
index c7decb31f7204..1bddb7d57ef68 100644
--- a/libraries/src/Form/Field/TimezoneField.php
+++ b/libraries/src/Form/Field/TimezoneField.php
@@ -128,7 +128,7 @@ protected function getGroups()
         // Build the group lists.
         foreach ($zones as $zone) {
             // Time zones not in a group we will ignore.
-            if (strpos($zone, '/') === false) {
+            if (!str_contains($zone, '/')) {
                 continue;
             }
 
diff --git a/libraries/src/Form/Field/UsergrouplistField.php b/libraries/src/Form/Field/UsergrouplistField.php
index 7899fb48957b8..68945e06f647c 100644
--- a/libraries/src/Form/Field/UsergrouplistField.php
+++ b/libraries/src/Form/Field/UsergrouplistField.php
@@ -54,7 +54,7 @@ class UsergrouplistField extends ListField
      */
     public function setup(\SimpleXMLElement $element, $value, $group = null)
     {
-        if (\is_string($value) && strpos($value, ',') !== false) {
+        if (\is_string($value) && str_contains($value, ',')) {
             $value = explode(',', $value);
         }
 
diff --git a/libraries/src/Form/FormField.php b/libraries/src/Form/FormField.php
index 381fb97a2c9d7..738abe888ae6e 100644
--- a/libraries/src/Form/FormField.php
+++ b/libraries/src/Form/FormField.php
@@ -1094,7 +1094,7 @@ public function filter($value, $group = null, ?Registry $input = null)
             }
 
             // Check for a callback filter
-            if (strpos($filter, '::') !== false) {
+            if (str_contains($filter, '::')) {
                 if (\is_callable(explode('::', $filter))) {
                     return \call_user_func(explode('::', $filter), $value);
                 }
diff --git a/libraries/src/Form/FormHelper.php b/libraries/src/Form/FormHelper.php
index 602745aaaecaf..749899d8c782d 100644
--- a/libraries/src/Form/FormHelper.php
+++ b/libraries/src/Form/FormHelper.php
@@ -509,7 +509,7 @@ public static function parseShowOnConditions($showOn, $formControl = null, $grou
                 continue;
             }
 
-            $compareEqual     = strpos($showOnPart, '!:') === false;
+            $compareEqual     = !str_contains($showOnPart, '!:');
             $showOnPartBlocks = explode(($compareEqual ? ':' : '!:'), $showOnPart, 2);
 
             $dotPos = strpos($showOnPartBlocks[0], '.');
diff --git a/libraries/src/Form/FormRule.php b/libraries/src/Form/FormRule.php
index 2fe8c5c7c1b2f..7efa6265a35c8 100644
--- a/libraries/src/Form/FormRule.php
+++ b/libraries/src/Form/FormRule.php
@@ -85,7 +85,7 @@ public function test(\SimpleXMLElement $element, $value, $group = null, ?Registr
 
         // Add unicode property support if available.
         if ($unicodePropertiesSupport) {
-            $this->modifiers = (strpos($this->modifiers, 'u') !== false) ? $this->modifiers : $this->modifiers . 'u';
+            $this->modifiers = (str_contains($this->modifiers, 'u')) ? $this->modifiers : $this->modifiers . 'u';
         }
 
         // Test the value against the regular expression.
diff --git a/libraries/src/HTML/HTMLHelper.php b/libraries/src/HTML/HTMLHelper.php
index 0c7714675935e..d66622487f88b 100644
--- a/libraries/src/HTML/HTMLHelper.php
+++ b/libraries/src/HTML/HTMLHelper.php
@@ -755,7 +755,7 @@ public static function image($file, $alt, $attribs = null, $relative = false, $r
             // Go through each argument
             foreach (explode(' ', $attribs) as $attribute) {
                 // When an argument without a value, default to an empty string
-                if (strpos($attribute, '=') === false) {
+                if (!str_contains($attribute, '=')) {
                     $attributes[$attribute] = '';
                     continue;
                 }
@@ -1037,7 +1037,7 @@ public static function tooltipText($title = '', $content = '', $translate = true
         // Don't process empty strings
         if ($content !== '' || $title !== '') {
             // Split title into title and content if the title contains '::' (old Mootools format).
-            if ($content === '' && !(strpos($title, '::') === false)) {
+            if ($content === '' && !(!str_contains($title, '::'))) {
                 list($title, $content) = explode('::', $title, 2);
             }
 
@@ -1355,7 +1355,7 @@ public static function strftimeFormatToDateFormat(string $strftimeformat)
          * If there is % character left after replacing, that mean one of unsupported format is used
          * the conversion false
          */
-        if (strpos($format, '%') !== false) {
+        if (str_contains($format, '%')) {
             return false;
         }
 
diff --git a/libraries/src/HTML/Helpers/Number.php b/libraries/src/HTML/Helpers/Number.php
index e0b30086a6459..0814e47eba685 100644
--- a/libraries/src/HTML/Helpers/Number.php
+++ b/libraries/src/HTML/Helpers/Number.php
@@ -58,7 +58,7 @@ public static function bytes($bytes, $unit = 'auto', $precision = 2, $iec = fals
             list(, $oBytes, $oUnit) = $matches;
 
             if ($oUnit && is_numeric($oBytes)) {
-                $oBase  = $iec && strpos($oUnit, 'i') === false ? 1000 : 1024;
+                $oBase  = $iec && !str_contains($oUnit, 'i') ? 1000 : 1024;
                 $factor = pow($oBase, stripos('BKMGTPEZY', $oUnit[0]));
                 $oBytes *= $factor;
             }
diff --git a/libraries/src/HTML/Helpers/Select.php b/libraries/src/HTML/Helpers/Select.php
index 476e976c2818f..0a6993e01be2d 100644
--- a/libraries/src/HTML/Helpers/Select.php
+++ b/libraries/src/HTML/Helpers/Select.php
@@ -140,7 +140,7 @@ public static function genericlist(
         $id = str_replace(['[', ']', ' '], '', $id);
 
         // If the selectbox contains "form-select-color-state" then load the JS file
-        if (strpos($attribs, 'form-select-color-state') !== false) {
+        if (str_contains($attribs, 'form-select-color-state')) {
             Factory::getDocument()->getWebAssetManager()
                 ->registerAndUseScript(
                     'webcomponent.select-colour',
diff --git a/libraries/src/HTML/Helpers/StringHelper.php b/libraries/src/HTML/Helpers/StringHelper.php
index 293eff376172c..4b521cf2f6445 100644
--- a/libraries/src/HTML/Helpers/StringHelper.php
+++ b/libraries/src/HTML/Helpers/StringHelper.php
@@ -67,7 +67,7 @@ public static function truncate($text, $length = 0, $noSplit = true, $allowHtml
         if ($length > 0 && FrameworkStringHelper::strlen($text) > $length) {
             $tmp = trim(FrameworkStringHelper::substr($text, 0, $length));
 
-            if ($tmp[0] === '<' && strpos($tmp, '>') === false) {
+            if ($tmp[0] === '<' && !str_contains($tmp, '>')) {
                 return '...';
             }
 
@@ -165,7 +165,7 @@ public static function truncateComplex($html, $maxLength = 0, $noSplit = true)
         }
 
         // Take care of short simple cases.
-        if ($maxLength <= 3 && $html[0] !== '<' && strpos(substr($html, 0, $maxLength - 1), '<') === false && $baseLength > $maxLength) {
+        if ($maxLength <= 3 && $html[0] !== '<' && !str_contains(substr($html, 0, $maxLength - 1), '<') && $baseLength > $maxLength) {
             return '...';
         }
 
diff --git a/libraries/src/Helper/MediaHelper.php b/libraries/src/Helper/MediaHelper.php
index 4b6ba22886464..85e7cfc6b9235 100644
--- a/libraries/src/Helper/MediaHelper.php
+++ b/libraries/src/Helper/MediaHelper.php
@@ -385,7 +385,7 @@ public function countFiles($dir)
             $d = dir($dir);
 
             while (($entry = $d->read()) !== false) {
-                if ($entry[0] !== '.' && strpos($entry, '.html') === false && strpos($entry, '.php') === false && is_file($dir . DIRECTORY_SEPARATOR . $entry)) {
+                if ($entry[0] !== '.' && !str_contains($entry, '.html') && !str_contains($entry, '.php') && is_file($dir . DIRECTORY_SEPARATOR . $entry)) {
                     $total_file++;
                 }
 
diff --git a/libraries/src/Helper/ModuleHelper.php b/libraries/src/Helper/ModuleHelper.php
index 704e8fd693731..f5a7b20398c60 100644
--- a/libraries/src/Helper/ModuleHelper.php
+++ b/libraries/src/Helper/ModuleHelper.php
@@ -319,7 +319,7 @@ public static function getLayoutPath($module, $layout = 'default')
         $defaultLayout = $layout;
         $template      = $templateObj->template;
 
-        if (strpos($layout, ':') !== false) {
+        if (str_contains($layout, ':')) {
             // Get the template and file name from the string
             $temp          = explode(':', $layout);
             $template      = $temp[0] === '_' ? $template : $temp[0];
diff --git a/libraries/src/Helper/TagsHelper.php b/libraries/src/Helper/TagsHelper.php
index 8eaf8a6956d5a..f26188f73a517 100644
--- a/libraries/src/Helper/TagsHelper.php
+++ b/libraries/src/Helper/TagsHelper.php
@@ -108,7 +108,7 @@ public function addTagMapping($ucmId, TableInterface $table, $tags = [])
         $typeId = $ucm->getTypeId();
 
         // Insert the new tag maps
-        if (strpos(implode(',', $tags), '#') !== false) {
+        if (str_contains(implode(',', $tags), '#')) {
             $tags = $this->createTagsFromField($tags);
         }
 
@@ -246,7 +246,7 @@ public function createTagsFromField($tags)
 
         foreach ($tags as $key => $tag) {
             // User is not allowed to create tags, so don't create.
-            if (!$canCreate && strpos($tag, '#new#') !== false) {
+            if (!$canCreate && str_contains($tag, '#new#')) {
                 continue;
             }
 
diff --git a/libraries/src/Installer/InstallerHelper.php b/libraries/src/Installer/InstallerHelper.php
index 5f68dc4998ac5..7b14e6799e161 100644
--- a/libraries/src/Installer/InstallerHelper.php
+++ b/libraries/src/Installer/InstallerHelper.php
@@ -290,7 +290,7 @@ public static function getFilenameFromUrl($url)
     {
         $default = uniqid();
 
-        if (!\is_string($url) || strpos($url, '/') === false) {
+        if (!\is_string($url) || !str_contains($url, '/')) {
             return $default;
         }
 
diff --git a/libraries/src/Language/Language.php b/libraries/src/Language/Language.php
index 6709047a9cc31..7c2089f7a5867 100644
--- a/libraries/src/Language/Language.php
+++ b/libraries/src/Language/Language.php
@@ -277,7 +277,7 @@ public function _($string, $jsSafe = false, $interpretBackSlashes = true)
             // Javascript filter
             $string = addslashes($string);
         } elseif ($interpretBackSlashes) {
-            if (strpos($string, '\\') !== false) {
+            if (str_contains($string, '\\')) {
                 // Interpret \n and \t characters
                 $string = str_replace(['\\\\', '\t', '\n'], ["\\", "\t", "\n"], $string);
             }
diff --git a/libraries/src/Language/Text.php b/libraries/src/Language/Text.php
index 90c910e651682..15af9680d16ab 100644
--- a/libraries/src/Language/Text.php
+++ b/libraries/src/Language/Text.php
@@ -92,7 +92,7 @@ public static function _($string, $jsSafe = false, $interpretBackSlashes = true,
     private static function passSprintf(&$string, $jsSafe = false, $interpretBackSlashes = true, $script = false)
     {
         // Check if string contains a comma
-        if (empty($string) || strpos($string, ',') === false) {
+        if (empty($string) || !str_contains($string, ',')) {
             return false;
         }
 
diff --git a/libraries/src/MVC/Controller/BaseController.php b/libraries/src/MVC/Controller/BaseController.php
index 3f942a0aa6080..980741de27004 100644
--- a/libraries/src/MVC/Controller/BaseController.php
+++ b/libraries/src/MVC/Controller/BaseController.php
@@ -300,7 +300,7 @@ public static function getInstance($prefix, $config = [])
         }
 
         // Check for a controller.task command.
-        if (strpos($command, '.') !== false) {
+        if (str_contains($command, '.')) {
             // Explode the controller.task command.
             list($type, $task) = explode('.', $command);
 
diff --git a/libraries/src/MVC/Model/LegacyModelLoaderTrait.php b/libraries/src/MVC/Model/LegacyModelLoaderTrait.php
index 4f120a6be8e3b..61a73f15dee41 100644
--- a/libraries/src/MVC/Model/LegacyModelLoaderTrait.php
+++ b/libraries/src/MVC/Model/LegacyModelLoaderTrait.php
@@ -160,12 +160,12 @@ private static function createModelFromComponent($type, $prefix = '', $config =
         $sitePath  = Path::clean(JPATH_SITE . '/components/' . $componentName);
 
         foreach (self::addIncludePath() as $path) {
-            if (strpos($path, $adminPath) !== false) {
+            if (str_contains($path, $adminPath)) {
                 $client = 'Administrator';
                 break;
             }
 
-            if (strpos($path, $sitePath) !== false) {
+            if (str_contains($path, $sitePath)) {
                 $client = 'Site';
                 break;
             }
diff --git a/libraries/src/MVC/View/HtmlView.php b/libraries/src/MVC/View/HtmlView.php
index 7ef977e76f7bc..aa82b04dae6aa 100644
--- a/libraries/src/MVC/View/HtmlView.php
+++ b/libraries/src/MVC/View/HtmlView.php
@@ -281,7 +281,7 @@ public function setLayout($layout)
     {
         $previous = $this->_layout;
 
-        if (strpos($layout, ':') === false) {
+        if (!str_contains($layout, ':')) {
             $this->_layout = $layout;
         } else {
             // Convert parameter to array based on :
diff --git a/libraries/src/Mail/MailHelper.php b/libraries/src/Mail/MailHelper.php
index 196cc1fb836aa..349f067361b9a 100644
--- a/libraries/src/Mail/MailHelper.php
+++ b/libraries/src/Mail/MailHelper.php
@@ -202,7 +202,7 @@ public static function convertRelativeToAbsoluteUrls($content)
         $siteUrl = Uri::root();
 
         // Replace none SEF URLs by absolute SEF URLs
-        if (strpos($content, 'href="index.php?') !== false) {
+        if (str_contains($content, 'href="index.php?')) {
             preg_match_all('#href="index.php\?([^"]+)"#m', $content, $matches);
 
             foreach ($matches[1] as $urlQueryString) {
@@ -221,7 +221,7 @@ public static function convertRelativeToAbsoluteUrls($content)
         $attributes = ['href=', 'src=', 'poster=', 'loading=', 'data-path='];
 
         foreach ($attributes as $attribute) {
-            if (strpos($content, $attribute) !== false) {
+            if (str_contains($content, $attribute)) {
                 // If the attribute is 'loading=', remove loading="lazy"
                 if ($attribute === 'loading=') {
                     $content = preg_replace('/\s' . $attribute . '"lazy"/i', '', $content);
diff --git a/libraries/src/Pathway/SitePathway.php b/libraries/src/Pathway/SitePathway.php
index f6e6273990833..d60ce71db0f99 100644
--- a/libraries/src/Pathway/SitePathway.php
+++ b/libraries/src/Pathway/SitePathway.php
@@ -60,7 +60,7 @@ public function __construct(?SiteApplication $app = null)
                             break;
 
                         case 'url':
-                            if ((str_starts_with($link->link, 'index.php?')) && (strpos($link->link, 'Itemid=') === false)) {
+                            if ((str_starts_with($link->link, 'index.php?')) && (!str_contains($link->link, 'Itemid='))) {
                                 // If this is an internal Joomla link, ensure the Itemid is set.
                                 $url = $link->link . '&Itemid=' . $link->id;
                             } else {
diff --git a/libraries/src/Plugin/PluginHelper.php b/libraries/src/Plugin/PluginHelper.php
index 9977628cc163d..bb78c1193a8ca 100644
--- a/libraries/src/Plugin/PluginHelper.php
+++ b/libraries/src/Plugin/PluginHelper.php
@@ -61,7 +61,7 @@ public static function getLayoutPath($type, $name, $layout = 'default')
         $defaultLayout = $layout;
         $template      = $templateObj->template;
 
-        if (strpos($layout, ':') !== false) {
+        if (str_contains($layout, ':')) {
             // Get the template and file name from the string
             $temp          = explode(':', $layout);
             $template      = $temp[0] === '_' ? $templateObj->template : $temp[0];
diff --git a/libraries/src/Router/Router.php b/libraries/src/Router/Router.php
index d4b09676c3700..56d02ecfb931d 100644
--- a/libraries/src/Router/Router.php
+++ b/libraries/src/Router/Router.php
@@ -469,7 +469,7 @@ protected function createUri($url)
         if (\is_string($url)) {
             $vars = [];
 
-            if (strpos($url, '&amp;') !== false) {
+            if (str_contains($url, '&amp;')) {
                 $url = str_replace('&amp;', '&', $url);
             }
 
diff --git a/libraries/src/Session/Session.php b/libraries/src/Session/Session.php
index 3ecab12b2b945..626f9675b63e9 100644
--- a/libraries/src/Session/Session.php
+++ b/libraries/src/Session/Session.php
@@ -202,7 +202,7 @@ public function get($name, $default = null)
          * This is no longer the case in Joomla 4 and will be converted
          * when saving new values in `self::set()`
          */
-        if (strpos($name, '.') !== false && parent::has('__' . $name)) {
+        if (str_contains($name, '.') && parent::has('__' . $name)) {
             return parent::get('__' . $name, $default);
         }
 
@@ -281,7 +281,7 @@ public function has($name)
          * This is no longer the case in Joomla 4 and will be converted
          * when saving new values in `self::set()`
          */
-        if (strpos($name, '.') !== false && parent::has('__' . $name)) {
+        if (str_contains($name, '.') && parent::has('__' . $name)) {
             return true;
         }
 
diff --git a/libraries/src/Uri/Uri.php b/libraries/src/Uri/Uri.php
index 2c99156c6fdf3..d4036e83a6ddb 100644
--- a/libraries/src/Uri/Uri.php
+++ b/libraries/src/Uri/Uri.php
@@ -148,7 +148,7 @@ public static function base($pathonly = false)
             } else {
                 static::$base['prefix'] = $uri->toString(['scheme', 'host', 'port']);
 
-                if (strpos(PHP_SAPI, 'cgi') !== false && !\ini_get('cgi.fix_pathinfo') && !empty($_SERVER['REQUEST_URI'])) {
+                if (str_contains(PHP_SAPI, 'cgi') && !\ini_get('cgi.fix_pathinfo') && !empty($_SERVER['REQUEST_URI'])) {
                     // PHP-CGI on Apache with "cgi.fix_pathinfo = 0"
 
                     // We shouldn't have user-supplied PATH_INFO in PHP_SELF in this case
@@ -250,7 +250,7 @@ public static function isInternal($url)
         if (
             empty($host) && str_starts_with($uri->path, 'index.php')
             || !empty($host) && preg_match('#^' . preg_quote(static::base(), '#') . '#', $base)
-            || !empty($host) && $host === static::getInstance(static::base())->host && strpos($uri->path, 'index.php') !== false
+            || !empty($host) && $host === static::getInstance(static::base())->host && str_contains($uri->path, 'index.php')
             || !empty($host) && $base === $host && preg_match('#^' . preg_quote($base, '#') . '#', static::base())
         ) {
             return true;
diff --git a/libraries/src/WebAsset/WebAssetItem.php b/libraries/src/WebAsset/WebAssetItem.php
index aeac8f65805b7..2632f5cc2efe5 100644
--- a/libraries/src/WebAsset/WebAssetItem.php
+++ b/libraries/src/WebAsset/WebAssetItem.php
@@ -348,6 +348,6 @@ protected function isPathExternal(string $path): bool
     protected function isPathAbsolute(string $path): bool
     {
         // We have a full path or not
-        return strpos($path, '/') !== false && is_file(JPATH_ROOT . '/' . $path);
+        return str_contains($path, '/') && is_file(JPATH_ROOT . '/' . $path);
     }
 }