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@ 2014-02-05T22:32:33Z

<?php
$string = '2014-02-05_10_10_33_664766918_index.log';

echo substr ($string, 0, strrpos($string, '.'));

Output
Performance
VLD
References
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substr: documentation ( source)
strrpos: documentation ( source)

preferences:dark modelive preview

42.57 ms | 402 KiB | 5 Q