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@ 2020-01-22T03:12:42Z

<?php

$html = '<h2>Spiders</h2>
<h2>Beetles</h2>
<h3>External morphology</h3>
<h4>Head</h4>
<h4>Thorax</h4>
<h4>Legs</h4>
<h3>Anatomy and physiology</h3>
<h2>Ants</h2>';

preg_match_all('/<h(\d)>([^<]+)/', $html, $matches);
$cdepth = $matches[1][0] - 1;
foreach ($matches[1] as $key => $depth) {
    if ($depth > $cdepth) {
        echo "\n" . str_repeat(' ', $cdepth * 4) . "<ol>\n";
    }
    elseif ($depth < $cdepth) {
        echo "</li>\n" . str_repeat(' ', $depth * 4) . "</ol>\n" . str_repeat(' ', $depth * 4) . "</li>\n";
    }
    else {
        echo "</li>\n";
    }
    $cdepth = $depth;
    echo str_repeat(' ', $cdepth * 4) . "<li><a href=\"{$matches[2][$key]}\">{$matches[2][$key]}</a>";
}
while ($cdepth-- >= $matches[1][0]) {
    echo "</li>\n" . str_repeat(' ', $cdepth * 4) . "</ol>\n";
}

Output for git.master, git.master_jit, rfc.property-hooks: <ol> <li><a href="Spiders">Spiders</a></li> <li><a href="Beetles">Beetles</a> <ol> <li><a href="External morphology">External morphology</a> <ol> <li><a href="Head">Head</a></li> <li><a href="Thorax">Thorax</a></li> <li><a href="Legs">Legs</a></li> </ol> </li> <li><a href="Anatomy and physiology">Anatomy and physiology</a></li> </ol> </li> <li><a href="Ants">Ants</a></li> </ol>

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Once feature-branches are merged or declined, they are no longer available. Their functionality (when merged) can be viewed from the main output page

2022-12-01 RFC: Property hooks - included in PHP 8.4
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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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