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<?php $timeString = "2010-03-18 10:50:57"; echo preg_replace_callback( '~:\K(\d{2}).*~', fn($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 for git.master, git.master_jit, rfc.property-hooks
2010-03-18 10:45:00 --- 2010-03-18 10:45:00

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