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<?php var_dump(strtotime(null)); var_dump(date("Y-m-d H:i:s", strtotime("monday this week", strtotime("2013-10-18"))));
Output for 5.3.0 - 7.1.0
bool(false) string(19) "2013-10-14 00:00:00"
Output for 5.1.2 - 5.2.17
bool(false) string(19) "2013-10-21 00:00:00"
Output for 5.1.0 - 5.1.1
int(1382341718) string(19) "2013-10-21 00:00:00"
Output for 5.0.1 - 5.0.5
Warning: strtotime(): Called with an empty time parameter. in /in/c0Ov1 on line 2 int(-1) string(19) "2013-10-21 00:00:00"
Output for 4.3.5 - 5.0.0
Notice: strtotime(): Called with empty time parameter in /in/c0Ov1 on line 2 int(1382306400) string(19) "2013-10-21 00:00:00"
Output for 4.3.2 - 4.3.4
Notice: strtotime(): Called with empty time parameter in /in/c0Ov1 on line 2 int(1382306400) string(19) "2013-10-27 23:00:00"
Output for 4.3.0 - 4.3.1
Notice: strtotime() [http://www.php.net/function.strtotime]: Called with empty time parameter in /in/c0Ov1 on line 2 int(1382306400) string(19) "2013-10-27 23:00:00"