enh(php) support First-class Callable Syntax

CHANGES.md

@@ -13,6 +13,7 @@ These changes should be for the better and should not be super noticeable but if
 
 Grammars:
 
+- enh(php) support First-class Callable Syntax (#3427) [Wojciech Kania][]
 - enh(php) support class constructor call (#3427) [Wojciech Kania][]
 - enh(php) support function invoke (#3427) [Wojciech Kania][]
 - enh(php) Switch highlighter to partially case-insensitive (#3427) [Wojciech Kania][]
@@ -48,6 +49,7 @@ Themes:
 
 - Modified background color in css for Gradient Light and Gradient Dark themes [Samia Ali][]
 
+[Wojciech Kania]: https://github.com/wkania
 [Jeylani B]: https://github.com/jeyllani
 [Richard Gibson]: https://github.com/gibson042
 [Bradley Mackey]: https://github.com/bradleymackey

src/languages/php.js

@@ -303,11 +303,11 @@ export default function(hljs) {
       {
         match: [
           /new/,
-          /\s+/,
+          / +/,
           // to prevent built ins from being confused as the class constructor call
           regex.concat("(?!", normalizeKeywords(BUILT_INS).join("\\b|"), "\\b)"),
           /\\?\w+/,
-          /\s*\(/,
+          / *\(/,
         ],
         scope: {
           1: "keyword",
@@ -320,7 +320,7 @@ export default function(hljs) {
   const FUNCTION_INVOKE = {
     relevance: 0,
     match: [
-      /(?:->|::|\s|\(|\\)/,
+      /\b/,
       // to prevent keywords from being confused as the function title
       regex.concat("(?!fn\\b|function\\b|", normalizeKeywords(KWS).join("\\b|"), "|", normalizeKeywords(BUILT_INS).join("\\b|"), "\\b)"),
       /\w+/,
@@ -374,7 +374,8 @@ export default function(hljs) {
       FUNCTION_INVOKE,
       {
         // swallow composed identifiers to avoid parsing them as keywords
-        begin: /(::|->)+[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*/
+        begin: /(::|->)+[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*(?! *\()(?![a-zA-Z0-9_\x7f-\xff])/,
+        // scope:"wrong"
       },
       CONSTRUCTOR_CALL,
       {

test/markup/php/functions.expect.txt

@@ -35,3 +35,9 @@ DateTimeImmutable::<span class="hljs-function title_ invoke__">createFromMutable
             <span class="hljs-keyword">throw</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">\Exception</span>(<span class="hljs-string">&#x27;error&#x27;</span>);
     }
 }
+
+<span class="hljs-comment">/**
+ * First-class Callable Syntax
+ */</span>
+<span class="hljs-variable">$fun</span> = <span class="hljs-function title_ invoke__">mb_strlen</span>();
+<span class="hljs-variable">$fun</span>();

test/markup/php/functions.txt

@@ -35,3 +35,9 @@ function testMe(string|int $name): int
             throw new \Exception('error');
     }
 }
+
+/**
+ * First-class Callable Syntax
+ */
+$fun = mb_strlen();
+$fun();