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run code in 300+ PHP versions simultaneously
<?php namespace Foo; function assert() {}
Output for 8.5.0 - 8.5.3
Fatal error: Defining a custom assert() function is not allowed, as the function has special semantics in /in/bRAbN on line 5 Stack trace: #0 {main}
Process exited with code 255.
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18
Fatal error: Defining a custom assert() function is not allowed, as the function has special semantics in /in/bRAbN on line 5
Process exited with code 255.
Output for 7.3.0 - 7.3.31, 7.3.33, 7.4.0 - 7.4.25, 7.4.27 - 7.4.33
Deprecated: Defining a custom assert() function is deprecated, as the function has special semantics in /in/bRAbN on line 5
Output for 7.3.32, 7.4.26

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