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<?php function foo() { echo 'foo'; } echo (NULL === set_error_handler('foo')); echo (NULL === set_error_handler('bar'));
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
1 Fatal error: Uncaught TypeError: set_error_handler(): Argument #1 ($callback) must be a valid callback or null, function "bar" not found or invalid function name in /in/9Oebi:5 Stack trace: #0 /in/9Oebi(5): set_error_handler('bar') #1 {main} thrown in /in/9Oebi on line 5
Process exited with code 255.
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 1 Fatal error: Uncaught TypeError: set_error_handler(): Argument #1 ($callback) must be a valid callback or null, function "bar" not found or invalid function name in /in/9Oebi:5 Stack trace: #0 /in/9Oebi(5): set_error_handler('bar') #1 {main} thrown in /in/9Oebi on line 5
Process exited with code 255.
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
1foo1

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