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<?php function add() { $list = array(); $prepare = function($value) use(&$prepare, &$list) { if (is_array($value)) { return array_map($prepare, array_merge($list, $value)); } $list[] = $value; }; return false === array_walk(func_get_args(), $prepare, $list) ? 0 : addition(0, $list); } function addition($sum, array &$list) { return empty($list) ? $sum : addition($sum + array_pop($list), $list); } echo add(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
Output for 8.3.0 - 8.3.4, 8.3.6
Fatal error: Uncaught Error: array_walk(): Argument #1 ($array) could not be passed by reference in /in/cR67D:13 Stack trace: #0 /in/cR67D(20): add(1, 2, 3, 4, 5, 6, 7, 8, 9, 10) #1 {main} thrown in /in/cR67D on line 13
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: array_walk(): Argument #1 ($array) could not be passed by reference in /in/cR67D:13 Stack trace: #0 /in/cR67D(20): add(1, 2, 3, 4, 5, 6, 7, 8, 9, 10) #1 {main} thrown in /in/cR67D on line 13
Process exited with code 255.
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18
Fatal error: Uncaught Error: array_walk(): Argument #1 ($array) cannot be passed by reference in /in/cR67D:13 Stack trace: #0 /in/cR67D(20): add(1, 2, 3, 4, 5, 6, 7, 8, 9, 10) #1 {main} thrown in /in/cR67D on line 13
Process exited with code 255.
Output for 7.4.9 - 7.4.33
Fatal error: Uncaught Error: Cannot pass parameter 1 by reference in /in/cR67D:13 Stack trace: #0 /in/cR67D(20): add(1, 2, 3, 4, 5, 6, 7, 8, 9, 10) #1 {main} thrown in /in/cR67D on line 13
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.8
55
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20
Notice: Only variables should be passed by reference in /in/cR67D on line 13 55
Output for 5.4.2 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28
Strict Standards: Only variables should be passed by reference in /in/cR67D on line 13 55
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