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<?php $a = array("dec 2015", "january 2015", "jan 2015", "2 jan 2015"); var_dump(array_map(function($v) { return (new DateTime($v))->getDay(); }, $a));
based on 0OT2M
Output for 7.0.0 - 7.2.0
Fatal error: Uncaught Error: Call to undefined method DateTime::getDay() in /in/1ZGdk:4 Stack trace: #0 [internal function]: {closure}('dec 2015') #1 /in/1ZGdk(4): array_map(Object(Closure), Array) #2 {main} thrown in /in/1ZGdk on line 4
Process exited with code 255.
Output for 5.4.12 - 5.6.28
Fatal error: Call to undefined method DateTime::getDay() in /in/1ZGdk on line 4
Process exited with code 255.
Output for 5.3.22 - 5.3.29
Parse error: syntax error, unexpected T_OBJECT_OPERATOR in /in/1ZGdk on line 4
Process exited with code 255.