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@ 2021-11-06T17:53:17Z

<?php

preg_replace_callback(
    '#a#',
    function($matches) {
        var_dump($matches);
    },
    'aa'
);

preg_replace_callback(
    '#(?<hello>a)#',
    function($matches) {
        var_dump($matches);
    },
    'aa'
);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
preg_replace_callback: documentation ( source)

preferences:dark modelive preview

66.35 ms | 405 KiB | 5 Q