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@ 2016-06-09T15:39:27Z

<?php



function replace($row){
    $replaced = preg_replace_callback("~(\<span class=\"itemopener\"\>)(\d{2})\s(top\</span\>.*\<span class=\"allopener\"\>).{3}(\</span\>)~iU", function($matches){
        $str = $matches[1] . $matches[3] . $matches[2] . $matches[4];
        return $str;
    }, $row);
    return $replaced;
}

$s = '<span class="itemopener">82 top</span>&nbsp;<span class="allopener">all</span>';
$replaced = replace($s);

echo "<pre>" . print_r($replaced, 1) . "</pre>";
exit();

Output
Performance
VLD
References
Branches

preg_replace_callback: documentation ( source)
print_r: documentation ( source)

preferences:dark modelive preview

53.6 ms | 402 KiB | 5 Q