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@ 2015-11-16T09:02:52Z

<?php 

$htmlData = '<h1><span> test&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>
<span> test&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>
<span> test&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>
<span> test&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>
</h1>
';
echo $htmlData = preg_replace_callback('/<li(.*?)>(.*?)<\/li>(.*?)/s', 'self::replaceRule19Matches', $htmlData);

function replaceRule19Matches($matches)
    {
        $outString = '';
        $matchList = [];
        preg_match_all('/<span[^>]*>(.*?)<\/span>/s', $matches[0], $matchList);
        foreach ($matchList[0] as $match) {

            $htmlToMatch = htmlentities($match);

            if ((substr_count($htmlToMatch, "&amp;nbsp;") == 5) && (str_word_count($htmlToMatch) == 5)) {
                $outString = str_replace($match, '<b style="width:14px;  display: inline-block;">&nbsp;</b>', $matches[0]);
            } else if (substr_count($htmlToMatch, "&amp;nbsp;") == 20) {
                $outString = str_replace($match, '<b style="width:35px;  display: inline-block;">&nbsp;</b>', $matches[0]);
            }

        }

        return $outString == '' ? $matches[0] : $outString;
    }

Output for git.master, git.master_jit, rfc.property-hooks: Fatal error: Uncaught TypeError: preg_replace_callback(): Argument #2 ($callback) must be a valid callback, cannot access "self" when no class scope is active in /in/NP3f8:9 Stack trace: #0 /in/NP3f8(9): preg_replace_callback('/<li(.*?)>(.*?)...', 'self::replaceRu...', '<h1><span> test...') #1 {main} thrown in /in/NP3f8 on line 9
Process exited with code 255.

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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