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<?php function test(&$error) { $response = (object)array(); $fail = function($err) { $error[] = $err; return $response; }; return $fail('invalid derp'); } $error = array(); $response = $test($error); var_dump($error);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
Warning: Undefined variable $test in /in/YQftF on line 15 Fatal error: Uncaught Error: Value of type null is not callable in /in/YQftF:15 Stack trace: #0 {main} thrown in /in/YQftF on line 15
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 Warning: Undefined variable $test in /in/YQftF on line 15 Fatal error: Uncaught Error: Value of type null is not callable in /in/YQftF:15 Stack trace: #0 {main} thrown in /in/YQftF on line 15
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.25, 7.4.27 - 7.4.33
Notice: Undefined variable: test in /in/YQftF on line 15 Fatal error: Uncaught Error: Function name must be a string in /in/YQftF:15 Stack trace: #0 {main} thrown in /in/YQftF on line 15
Process exited with code 255.
Output for 7.3.32 - 7.3.33, 7.4.26
Fatal error: Uncaught Error: Function name must be a string in /in/YQftF:15 Stack trace: #0 {main} thrown in /in/YQftF on line 15
Process exited with code 255.
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28
Notice: Undefined variable: test in /in/YQftF on line 15 Fatal error: Function name must be a string in /in/YQftF on line 15
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/YQftF on line 6
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/YQftF on line 6
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/YQftF on line 6
Process exited with code 255.

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