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<?php $d1=new DateTime("2014-07-31"); $d1->add('P20D'); var_dump($d1);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught TypeError: DateTime::add(): Argument #1 ($interval) must be of type DateInterval, string given in /in/fO8R2:4 Stack trace: #0 /in/fO8R2(4): DateTime->add('P20D') #1 {main} thrown in /in/fO8R2 on line 4
Process exited with code 255.
Output for 5.4.30 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
Warning: DateTime::add() expects parameter 1 to be DateInterval, string given in /in/fO8R2 on line 4 object(DateTime)#1 (3) { ["date"]=> string(26) "2014-07-31 00:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 7.3.32 - 7.3.33
Warning: DateTime::add() expects parameter 1 to be DateInterval, string given in /in/fO8R2 on line 4 object(DateTime)#1 (3) { ["date"]=> string(26) "2014-07-31 00:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(3) "UTC" }
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.29
Warning: DateTime::add() expects parameter 1 to be DateInterval, string given in /in/fO8R2 on line 4 object(DateTime)#1 (3) { ["date"]=> string(19) "2014-07-31 00:00:00" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }
Output for 5.2.0 - 5.2.17
Fatal error: Call to undefined method DateTime::add() in /in/fO8R2 on line 4
Process exited with code 255.
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6
Fatal error: Class 'DateTime' not found in /in/fO8R2 on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.9
Fatal error: Cannot instantiate non-existent class: datetime in /in/fO8R2 on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Cannot instantiate non-existent class: datetime in /in/fO8R2 on line 3

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