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@ 2019-04-13T07:41:13Z

<?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 git.master, git.master_jit, rfc.property-hooks: <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"></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>

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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