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<?php var_dump(json_encode(new DateTimeImmutable('2015-05-03')));
based on g0144
Output for 5.5.14 - 7.2.0
string(86) "{"date":"2015-05-03 00:00:00.000000","timezone_type":3,"timezone":"Europe\/Amsterdam"}"
Output for 5.5.0 - 5.5.13
string(79) "{"date":"2015-05-03 00:00:00","timezone_type":3,"timezone":"Europe\/Amsterdam"}"
Output for 5.2.0 - 5.4.45
Fatal error: Class 'DateTimeImmutable' not found in /in/vS0QU on line 3
Process exited with code 255.
Output for 5.0.0 - 5.1.6
Fatal error: Call to undefined function json_encode() in /in/vS0QU on line 3
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: json_encode() in /in/vS0QU on line 3
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: json_encode() in /in/vS0QU on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: json_encode() in /in/vS0QU on line 3