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@ 2019-08-21T10:04:59Z

<?php
define('PINGTAGS', [
        '#' => 'hashtag.php?hashtag',
        '@' => 'user.php?user'
    ]);

function convert_text($str) {
    return preg_replace_callback(
        "~(?i)\bhttps?[-\w.\~:/?#[\]@!$&'()*+,;=]+|[@#](\w+)|U\+([A-F\d]{5})~",
        function($m) {
            // var_export($m);  // see for yourself
            if (!isset($m[1])) {
                return sprintf('<a href="%s">%s</a>', $m[0], $m[0]);
            }
            if (!isset($m[2])) {
                return sprintf('<a href="%s=%s">%s</a>', PINGTAGS[$m[0][0]], $m[1], $m[0]);
            }
            return "<span class=\"emoji\">&#x{$m[2]};</span>";
        },
        $str);
}


echo convert_text(
<<<STRING
This is a @ping and a #hash.
This is a www.example.com, this is http://example.com?asdf=1234#anchor
https://www.example.net/a/b/c/?g=5&awesome=foobar# U+23232 http://www5.example.com
https://sub.sub.www.example.org/ @pong@pug#tagged
http://example.com/@dave
more http://example.com/more_(than)_one_(parens)
andU+98765more http://example.com/blah_(wikipedia)#cite-1
and more http://example.com/blah_(wikipedia)_blah#cite-1
and more http://example.com/(something)?after=parens
STRING
);

Output for git.master, git.master_jit, rfc.property-hooks: This is a <a href="user.php?user=ping">@ping</a> and a <a href="hashtag.php?hashtag=hash">#hash</a>. This is a www.example.com, this is <a href="http://example.com?asdf=1234#anchor">http://example.com?asdf=1234#anchor</a> <a href="https://www.example.net/a/b/c/?g=5&awesome=foobar#">https://www.example.net/a/b/c/?g=5&awesome=foobar#</a> <span class="emoji">𣈲</span> <a href="http://www5.example.com">http://www5.example.com</a> <a href="https://sub.sub.www.example.org/">https://sub.sub.www.example.org/</a> <a href="user.php?user=pong">@pong</a><a href="user.php?user=pug">@pug</a><a href="hashtag.php?hashtag=tagged">#tagged</a> <a href="http://example.com/@dave">http://example.com/@dave</a> more <a href="http://example.com/more_(than)_one_(parens)">http://example.com/more_(than)_one_(parens)</a> and<span class="emoji">򘝥</span>more <a href="http://example.com/blah_(wikipedia)#cite-1">http://example.com/blah_(wikipedia)#cite-1</a> and more <a href="http://example.com/blah_(wikipedia)_blah#cite-1">http://example.com/blah_(wikipedia)_blah#cite-1</a> and more <a href="http://example.com/(something)?after=parens">http://example.com/(something)?after=parens</a>

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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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