3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array1 = ['keepThis', 'remove', false, 'keep', 'save', 'delete']; $array2 = ['hangOnto', 'remove', null, 'retain', 'keep', 'delete']; var_export([ array_filter( $array1, fn($value, $index) => $array2[$index] !== $value, ARRAY_FILTER_USE_BOTH ), array_filter( $array2, fn($value, $index) => $array1[$index] !== $value, ARRAY_FILTER_USE_BOTH ) ]);
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14
array ( 0 => array ( 0 => 'keepThis', 2 => false, 3 => 'keep', 4 => 'save', ), 1 => array ( 0 => 'hangOnto', 2 => NULL, 3 => 'retain', 4 => 'keep', ), )
preferences:
99.16 ms | 407 KiB | 5 Q