3v4l.org

run code in 300+ PHP versions simultaneously
<?php $yourarray = [ 'ABC123-A', 'BG231-B', 'ABC123-A', 'BG231-E', 'BG231-F', 'BG231-G', 'BG231-H', 'ABC123-A', 'BG231-J', 'BG231-K', 'ABC123-A' ]; $duplicated=null; foreach($yourarray as $k => $v){ foreach($yourarray as $k2 => $v2){ if($v == $v2 && $k2 != $k){ $duplicated[$k]=$v; break; } } } var_export($duplicated);
Output for 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
array ( 0 => 'ABC123-A', 2 => 'ABC123-A', 7 => 'ABC123-A', 10 => 'ABC123-A', )
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 array ( 0 => 'ABC123-A', 2 => 'ABC123-A', 7 => 'ABC123-A', 10 => 'ABC123-A', )
preferences:
155.82 ms | 402 KiB | 154 Q