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@ 2016-07-11T12:28:04Z

<?php

$timestamp = '-1';
$dt = DateTime::createFromFormat('U', $timestamp);
var_dump($dt->format('U') === $timestamp);

Output
Performance
VLD
References
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var_dump: documentation ( source)

preferences:dark modelive previewkey bindings

58.52 ms | 1683 KiB | 5 Q