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@ 2019-09-19T12:45:14Z

<?php

$timeString = "4:29:16";
echo preg_replace_callback(
        '~:\K(\d{2}).*~',
        fn($m) => $m[1] - $m[1] % 15 . ':00',
        $timeString
     );

echo "\n---\n";
echo preg_replace_callback(
        '~:\K(\d{2}).*~',
        function($m) {return $m[1] - $m[1] % 15 . ':00';},
        $timeString
     );

Output
Performance
VLD
References
Branches

preg_replace_callback: documentation ( source)

preferences:dark modelive previewkey bindings

31.19 ms | 405 KiB | 5 Q