PHP: Added match keyword (PHP 8.0) (#2574)

PHP introduces a new [`match` keyword in PHP 8.0](https://php.watch/versions/8.0/match-expression).

Author: Ayesh

components/prism-php.js

@@ -12,7 +12,7 @@
  */
 (function (Prism) {
 	Prism.languages.php = Prism.languages.extend('clike', {
-		'keyword': /\b(?:__halt_compiler|abstract|and|array|as|break|callable|case|catch|class|clone|const|continue|declare|default|die|do|echo|else|elseif|empty|enddeclare|endfor|endforeach|endif|endswitch|endwhile|eval|exit|extends|final|finally|for|foreach|function|global|goto|if|implements|include|include_once|instanceof|insteadof|interface|isset|list|namespace|new|or|parent|print|private|protected|public|require|require_once|return|static|switch|throw|trait|try|unset|use|var|while|xor|yield)\b/i,
+		'keyword': /\b(?:__halt_compiler|abstract|and|array|as|break|callable|case|catch|class|clone|const|continue|declare|default|die|do|echo|else|elseif|empty|enddeclare|endfor|endforeach|endif|endswitch|endwhile|eval|exit|extends|final|finally|for|foreach|function|global|goto|if|implements|include|include_once|instanceof|insteadof|interface|isset|list|match|namespace|new|or|parent|print|private|protected|public|require|require_once|return|static|switch|throw|trait|try|unset|use|var|while|xor|yield)\b/i,
 		'boolean': {
 			pattern: /\b(?:false|true)\b/i,
 			alias: 'constant'

components/prism-php.min.js

@@ -44,6 +44,7 @@ insteadof
 interface;
 isset
 list
+match
 namespace;
 new;
 or
@@ -116,6 +117,7 @@ yield
 	["keyword", "interface"], ["punctuation", ";"],
 	["keyword", "isset"],
 	["keyword", "list"],
+	["keyword", "match"],
 	["keyword", "namespace"], ["punctuation", ";"],
 	["keyword", "new"], ["punctuation", ";"],
 	["keyword", "or"],