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@ 2019-09-19T10:32:14Z

<?php

function _floor($time) {
    $elm = explode(':', $time);
    $elm[1] -= $elm[1] % 15;
    $elm[2] = '00';
    return implode(':', $elm);
}

echo _floor('07:17:46') . PHP_EOL;
echo _floor('06:25:25') . PHP_EOL;

Output
Performance
VLD
References
Branches

implode: documentation ( source)
explode: documentation ( source)

preferences:dark modelive previewkey bindings

35.51 ms | 405 KiB | 5 Q