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run code in 300+ PHP versions simultaneously
<?php filter_var('foo@bar.test', FILTER_VALIDATE_EMAIL, FILTER_THROW_ON_FAILURE|FILTER_NULL_ON_FAILURE);
Output for 8.5.0 - 8.5.2
Fatal error: Uncaught ValueError: filter_var(): Argument #3 ($options) cannot use both FILTER_NULL_ON_FAILURE and FILTER_THROW_ON_FAILURE in /in/Ibd4B:3 Stack trace: #0 /in/Ibd4B(3): filter_var('foo@bar.test', 274, 402653184) #1 {main} thrown in /in/Ibd4B on line 3
Process exited with code 255.
Output for 8.1.34, 8.2.30, 8.3.5 - 8.3.29, 8.4.9 - 8.4.16
Fatal error: Uncaught Error: Undefined constant "FILTER_THROW_ON_FAILURE" in /in/Ibd4B:3 Stack trace: #0 {main} thrown in /in/Ibd4B on line 3
Process exited with code 255.

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