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<?php $callable = function(&$foo) { $foo = 42; }; $bar = 23; $callable(23); var_dump($bar);
Output for 8.3.0 - 8.3.4, 8.3.6
Fatal error: Uncaught Error: {closure}(): Argument #1 ($foo) could not be passed by reference in /in/moE3A:8 Stack trace: #0 {main} thrown in /in/moE3A on line 8
Process exited with code 255.
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Fatal error: Uncaught Error: {closure}(): Argument #1 ($foo) could not be passed by reference in /in/moE3A:8 Stack trace: #0 {main} thrown in /in/moE3A on line 8
Process exited with code 255.
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18
Fatal error: Uncaught Error: {closure}(): Argument #1 ($foo) cannot be passed by reference in /in/moE3A:8 Stack trace: #0 {main} thrown in /in/moE3A on line 8
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Fatal error: Uncaught Error: Cannot pass parameter 1 by reference in /in/moE3A:8 Stack trace: #0 {main} thrown in /in/moE3A on line 8
Process exited with code 255.
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Fatal error: Cannot pass parameter 1 by reference in /in/moE3A on line 8
Process exited with code 255.

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