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<?php $a = array("1 2015", "2 2015", "2015 02", "dec 2015", "january 2015", "jan 2015"); var_dump(array_map(function($v) { return new DateTime($v); }, $a));
Output for 8.3.0 - 8.3.6
Fatal error: Uncaught DateMalformedStringException: Failed to parse time string (1 2015) at position 0 (1): Unexpected character in /in/XoMDv:4 Stack trace: #0 /in/XoMDv(4): DateTime->__construct('1 2015') #1 [internal function]: {closure}('1 2015') #2 /in/XoMDv(4): array_map(Object(Closure), Array) #3 {main} thrown in /in/XoMDv on line 4
Process exited with code 255.
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18
Fatal error: Uncaught Exception: Failed to parse time string (1 2015) at position 0 (1): Unexpected character in /in/XoMDv:4 Stack trace: #0 /in/XoMDv(4): DateTime->__construct('1 2015') #1 [internal function]: {closure}('1 2015') #2 /in/XoMDv(4): array_map(Object(Closure), Array) #3 {main} thrown in /in/XoMDv on line 4
Process exited with code 255.
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30
Fatal error: Uncaught Exception: DateTime::__construct(): Failed to parse time string (1 2015) at position 0 (1): Unexpected character in /in/XoMDv:4 Stack trace: #0 /in/XoMDv(4): DateTime->__construct('1 2015') #1 [internal function]: {closure}('1 2015') #2 /in/XoMDv(4): array_map(Object(Closure), Array) #3 {main} thrown in /in/XoMDv on line 4
Process exited with code 255.
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Warning: array_map(): An error occurred while invoking the map callback in /in/XoMDv on line 4 Fatal error: Uncaught exception 'Exception' with message 'DateTime::__construct(): Failed to parse time string (1 2015) at position 0 (1): Unexpected character' in /in/XoMDv:4 Stack trace: #0 /in/XoMDv(4): DateTime->__construct('1 2015') #1 [internal function]: {closure}('1 2015') #2 /in/XoMDv(4): array_map(Object(Closure), Array) #3 {main} thrown in /in/XoMDv on line 4
Process exited with code 255.

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