3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr = [ 'foo', 'foo', 'bar', 'baz', 'baz' ]; array_walk($arr, function (&$item, $k) use ($arr) { $lower = mb_strtolower($item, 'utf-8'); foreach ($arr as $i => $v) { var_dump($k .'='. $i); if ($i !== $k && $v !== null && $lower === mb_strtolower($v, 'utf-8')) { var_dump('rm'); $item = null; } } }); var_dump($arr);
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 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
string(3) "0=0" string(3) "0=1" string(2) "rm" string(3) "0=2" string(3) "0=3" string(3) "0=4" string(3) "1=0" string(2) "rm" string(3) "1=1" string(3) "1=2" string(3) "1=3" string(3) "1=4" string(3) "2=0" string(3) "2=1" string(3) "2=2" string(3) "2=3" string(3) "2=4" string(3) "3=0" string(3) "3=1" string(3) "3=2" string(3) "3=3" string(3) "3=4" string(2) "rm" string(3) "4=0" string(3) "4=1" string(3) "4=2" string(3) "4=3" string(2) "rm" string(3) "4=4" array(5) { [0]=> NULL [1]=> NULL [2]=> string(3) "bar" [3]=> NULL [4]=> NULL }
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 string(3) "0=0" string(3) "0=1" string(2) "rm" string(3) "0=2" string(3) "0=3" string(3) "0=4" string(3) "1=0" string(2) "rm" string(3) "1=1" string(3) "1=2" string(3) "1=3" string(3) "1=4" string(3) "2=0" string(3) "2=1" string(3) "2=2" string(3) "2=3" string(3) "2=4" string(3) "3=0" string(3) "3=1" string(3) "3=2" string(3) "3=3" string(3) "3=4" string(2) "rm" string(3) "4=0" string(3) "4=1" string(3) "4=2" string(3) "4=3" string(2) "rm" string(3) "4=4" array(5) { [0]=> NULL [1]=> NULL [2]=> string(3) "bar" [3]=> NULL [4]=> NULL }

preferences:
268.13 ms | 403 KiB | 291 Q