enh(php) add PHP constants

Author: wkania

src/languages/php.js

@@ -380,6 +380,18 @@ export default function(hljs) {
       },
       VARIABLE,
       FUNCTION_INVOKE,
+      {
+        match: [
+          /const/,
+          regex.concat(WHITESPACE, "+"),
+          IDENT_RE,
+          regex.concat(WHITESPACE, "*="),
+        ],
+        scope: {
+          1: "keyword",
+          3: "variable",
+        },
+      },
       {
         // swallow composed identifiers to avoid parsing them as keywords
         match: regex.concat(

test/markup/php/titles.expect.txt

@@ -0,0 +1,22 @@
+<span class="hljs-keyword">final</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Example</span> </span>{
+    <span class="hljs-keyword">const</span> <span class="hljs-variable">FOO</span>=<span class="hljs-string">&#x27;foo&#x27;</span>;
+
+    <span class="hljs-keyword">public</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">__construct</span>(<span class="hljs-params">
+        <span class="hljs-keyword">public</span> <span class="hljs-keyword">readonly</span> <span class="hljs-keyword">string</span> <span class="hljs-variable">$name</span> = <span class="hljs-built_in">self</span>::<span class="hljs-variable">FOO</span>
+    </span>) </span>{}
+
+    <span class="hljs-keyword">public</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">getClass</span>(<span class="hljs-params"></span>): <span class="hljs-title">string</span> </span>{
+        <span class="hljs-keyword">return</span> <span class="hljs-title class_">DateTimeImmutable</span>::<span class="hljs-variable language_">class</span>;
+    }
+
+    <span class="hljs-keyword">public</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">getClassFromSelf</span>(<span class="hljs-params"></span>): <span class="hljs-title">string</span> </span>{
+        <span class="hljs-keyword">return</span> <span class="hljs-built_in">self</span>::<span class="hljs-variable language_">class</span>;
+    }
+
+    <span class="hljs-keyword">public</span> <span class="hljs-built_in">static</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">getClassFromStatic</span>(<span class="hljs-params"></span>): <span class="hljs-title">string</span> </span>{
+        <span class="hljs-keyword">return</span> <span class="hljs-built_in">static</span>::<span class="hljs-variable language_">class</span>;
+    }
+}
+
+<span class="hljs-variable">$date</span> = DateTimeImmutable::<span class="hljs-title function_ invoke__">createFromMutable</span>(<span class="hljs-keyword">new</span> <span class="hljs-title class_">\DateTime</span>());
+<span class="hljs-keyword">echo</span> <span class="hljs-variable">$date</span>::<span class="hljs-variable language_">class</span>;

test/markup/php/titles.txt

@@ -0,0 +1,22 @@
+final class Example {
+    const FOO='foo';
+
+    public function __construct(
+        public readonly string $name = self::FOO
+    ) {}
+
+    public function getClass(): string {
+        return DateTimeImmutable::class;
+    }
+
+    public function getClassFromSelf(): string {
+        return self::class;
+    }
+
+    public static function getClassFromStatic(): string {
+        return static::class;
+    }
+}
+
+$date = DateTimeImmutable::createFromMutable(new \DateTime());
+echo $date::class;