refactor: use strict comparisons everywhere

Author: adevade

src/UrlBuilder.php

@@ -124,7 +124,7 @@ public function targetWidths(
         $stop=self::MAX_WIDTH,
         $tol=self::SRCSET_WIDTH_TOLERANCE) {
 
-        if ($start == $stop) {
+        if ($start === $stop) {
             return array((int) $start);
         }
 

src/UrlHelper.php

@@ -68,7 +68,7 @@ public function getURL() {
             ksort($this->params);
 
             foreach ($this->params as $key => $val) {
-                if (substr($key, -2) == '64') {
+                if (substr($key, -2) === '64') {
                     $encodedVal = self::base64url_encode($val);
                 } else {
                     $encodedVal = is_array($val) ? rawurlencode(implode(',',$val)) : rawurlencode($val);

src/Validator.php

@@ -47,7 +47,7 @@ public static function validateWidths($widths) {
             throw new \InvalidArgumentException("`widths` array cannot be `null`");
         }
 
-        if (count($widths) == 0) {
+        if (count($widths) === 0) {
             throw new \InvalidArgumentException("`widths` array cannot be empty");
         }
         foreach ($widths as &$w) {