3v4l.org

run code in 300+ PHP versions simultaneously
<?php $string = <<<'STRING' //single line comment random text ... #another comment Multiline comments: /* this is a multiline comment with 'squote and "dquote" matches the whole thing */ // single line 'squoted' "dquoted" comment w/ extra " for no reason More comments <!-- yatta yatta yatta yatta --> Quotes: "also matches strings with \" escaped quotes or 'the other kind of quotation marks in it' " a "nested 'squote with nested \"dquote\"'" assuming only outermost quoting matters for formatting 'matches the end quote because it it not escaped \\' STRING; const PATTERN = <<<'PATTERN' ~(?|(")(?:[^"\\]|\\(?s).)*"|(')(?:[^'\\]|\\(?s).)*'|(#|//).*|(/\*)(?s).*?\*/|(<!--)(?s).*?-->)~ PATTERN; const LOOKUP = [ '#' => 'gainsboro', '//' => 'lightgrey', '/*' => 'silver', '<!--' => 'darkgrey', "'" => 'mint', '"' => 'aqua' ]; echo preg_replace_callback(PATTERN, function($m) { //$marker = $m[1]; //$encoded = addcslashes($marker, '"'); //$class = LOOKUP[$marker] ?? "missing $encoded"; return "<span style=\"color:" . LOOKUP[$m[1]] . "\">{$m[0]}</span>"; }, $string);
Output for 7.1.25 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
<span style="color:lightgrey">//single line comment</span> random text ... <span style="color:gainsboro">#another comment</span> Multiline comments: <span style="color:silver">/* this is a multiline comment with 'squote and "dquote" matches the whole thing */</span> <span style="color:lightgrey">// single line 'squoted' "dquoted" comment w/ extra " for no reason</span> More comments <span style="color:darkgrey"><!-- yatta yatta yatta yatta --></span> Quotes: <span style="color:aqua">"also matches strings with \" escaped quotes or 'the other kind of quotation marks in it' "</span> a <span style="color:aqua">"nested 'squote with nested \"dquote\"'"</span> assuming only outermost quoting matters for formatting <span style="color:mint">'matches the end quote because it it not escaped \\'</span>
preferences:
152.11 ms | 405 KiB | 182 Q