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<?php function foo(mixed $arg): mixed { echo 'foo'; } foo('arg');
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
foo Fatal error: Uncaught TypeError: foo(): Return value must be of type mixed, none returned in /in/I5ipI:6 Stack trace: #0 /in/I5ipI(8): foo('arg') #1 {main} thrown in /in/I5ipI on line 6
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 foo Fatal error: Uncaught TypeError: foo(): Return value must be of type mixed, none returned in /in/I5ipI:6 Stack trace: #0 /in/I5ipI(8): foo('arg') #1 {main} thrown in /in/I5ipI on line 6
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Fatal error: Uncaught TypeError: Argument 1 passed to foo() must be an instance of mixed, string given, called in /in/I5ipI on line 8 and defined in /in/I5ipI:3 Stack trace: #0 /in/I5ipI(8): foo('arg') #1 {main} thrown in /in/I5ipI on line 3
Process exited with code 255.

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