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<?php $value='130'; var_dump(ctype_digit($value)); var_dump(new \DateTime('@' .$value)); $value=00000; var_dump(ctype_digit($value)); var_dump(new \DateTime('@' .$value));
based on hekfN
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) "1970-01-01 00:02:10.000000" ["timezone_type"]=> int(1) ["timezone"]=> string(6) "+00:00" } bool(false) object(DateTime)#1 (3) { ["date"]=> string(26) "1970-01-01 00:00:00.000000" ["timezone_type"]=> int(1) ["timezone"]=> string(6) "+00:00" }