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<?php var_dump( (new DateTime())->add('foobar') );
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6 - 8.3.7
Fatal error: Uncaught TypeError: DateTime::add(): Argument #1 ($interval) must be of type DateInterval, string given in /in/F7qsi:4 Stack trace: #0 /in/F7qsi(4): DateTime->add('foobar') #1 {main} thrown in /in/F7qsi on line 4
Process exited with code 255.
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Fatal error: Uncaught TypeError: DateTime::add(): Argument #1 ($interval) must be of type DateInterval, string given in /in/F7qsi:4 Stack trace: #0 /in/F7qsi(4): DateTime->add('foobar') #1 {main} thrown in /in/F7qsi on line 4
Process exited with code 255.
Output for 5.6.0 - 5.6.40, 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
Warning: DateTime::add() expects parameter 1 to be DateInterval, string given in /in/F7qsi on line 4 bool(false)

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