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<?php $x = function() { echo "hi"; }; $y = serialize( $x );
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.29, 8.2.0 - 8.2.21, 8.3.0 - 8.3.9
Fatal error: Uncaught Exception: Serialization of 'Closure' is not allowed in /in/1f86o:5 Stack trace: #0 /in/1f86o(5): serialize(Object(Closure)) #1 {main} thrown in /in/1f86o on line 5
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.30
Fatal error: Uncaught exception 'Exception' with message 'Serialization of 'Closure' is not allowed' in /in/1f86o:5 Stack trace: #0 /in/1f86o(5): serialize(Object(Closure)) #1 {main} thrown in /in/1f86o on line 5
Process exited with code 255.

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229.34 ms | 403 KiB | 336 Q