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@ 2015-11-09T02:55:25Z

<?php

var_dump(strtotime('-3 day'));

$str = '3day';

var_dump(strtotime("-{$str}"));

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
strtotime: documentation ( source)

preferences:dark modelive preview

34.45 ms | 402 KiB | 5 Q