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run code in 200+ php & hhvm versions
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<?php print_r( strtotime('2013-07-20 00:13:51.153000000') ); echo '--------------------------------'; print_r( strtotime('2013-07-20 00:13:51') );
Output for 5.1.0 - 7.2.0
--------------------------------1374272031
Output for 5.0.0 - 5.0.5
1374272031--------------------------------1374272031
Output for 4.3.0 - 4.4.9
-1--------------------------------1374272031