Add new keyword highlighting rules

Author: Ayesh

src/KeywordEnhancer.php

@@ -14,14 +14,14 @@ class KeywordEnhancer {
         '/\b(?<![`\\\\])[A-Z][A-Z\\\\a-z]+::[a-z][A-Za-z_\d]+\b(?![`\/(])/', // Class::constants
         '/\b(?<!`-)[a-z]+_[a-z]+(?:_[a-z_]+)?\(\)(?![`\/])/', // Functions with underscores and ()
         '/\b(?<![`>])[a-z_][a-z][a-z\d_]+\(\)(?![`.>\/-])/', // Functions with underscores and ()
-        '/\b(?<!`)(?:ldap|ftp|array|mb|stream|open|hash|xml|proc|pcntl)_[a-z_]+\d?\b(?![`\/])/', // Functions with underscores and no ()
+        '/\b(?<!`)(?:ldap|ftp|array|mb|stream|open|hash|xml|proc|pcntl|curl|intl|date|grapheme|socket|stream)_[a-z_]+\d?\b(?![`\/])/', // Functions with underscores and no ()
         '/\b(?<!`)(xleak|xfail|skipif)\b(?![`\/])/i', // xleak
         '/(?<![`>()-])--[a-z][a-z-]+(?![`])/i', // --flags, --flags-and-more
         '/(?<![`>()-])\bext\/[a-z_\d\/-]+\.phpt\b(?![`])/i', // ext/test/test/test.phpt
         '/\b(?<![`>:-])__[A-Z\d_]+(?![`])/i', // __PROPERTY__
         '/(?<=\s)(?<![`>-])\\\\[A-Z][a-z]+\\\\[A-Z][A-Za-z]+(?![`])\b/', // Stricter, class name like \Dom\HTMLDocument
-        '/\b(?<![`>()-])(?:(main|ext|Zend|tests|win32|scripts|sapi|pear|docs|build)\/(?:[a-z\/_]+))(?:\.(c|php|phpt|yml|yaml|cpp|m4|txt|w32|h))(?::\d+)?(?![`])/i', // files in php-src
-        '/\b(?<!`)(?:(SOAP|SO|TCP|SOCK|FILTER|XML|FTP|CURL|GREP))_[A-Z_]+\b(?![`\/(])/', // CONSTANTS (with fixed prefixes)
+        '/\b(?<![`>()-])(?:(main|ext|Zend|tests|win32|scripts|sapi|pear|docs|build)\/(?:[a-z\d\/_]+))(?:\.(c|php|phpt|yml|yaml|cpp|m4|txt|w32|h))(?::\d+)?(?![`])/i', // files in php-src
+        '/\b(?<!`)(?:(SOAP|SO|TCP|SOCK|FILTER|XML|FTP|CURL|CURLOPT|CURLE|CURLINFO|GREP|X509|ZEND|USE_ZEND))_[A-Z_]+\b(?![`\/(])/', // CONSTANTS (with fixed prefixes)
     ];
 
     public static function enhance(string $inputText): string {