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run code in 200+ php & hhvm versions
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<?php $value='1392387900'; var_dump(ctype_digit($value)); var_dump(new \DateTime('@' .$value)); $value=1092387900; var_dump(ctype_digit($value)); var_dump(new \DateTime('@' .$value));
based on 0bZvf
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.2.6
bool(true) object(DateTime)#1 (3) { ["date"]=> string(26) "2014-02-14 14:25:00.000000" ["timezone_type"]=> int(1) ["timezone"]=> string(6) "+00:00" } bool(true) object(DateTime)#1 (3) { ["date"]=> string(26) "2004-08-13 09:05:00.000000" ["timezone_type"]=> int(1) ["timezone"]=> string(6) "+00:00" }