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run code in 300+ PHP versions simultaneously
<?php $array = [ [ 'a' => 'b', 'c' => 'd', 'h' => 'e', 'i' => 'm' ], [ 'a' => 'b', 'f' => 'g', 'c' => 'f' ], [ 'a' => 'd', 'c' => 'd' ], [ 'i' => 'm' ] ]; for ($i = 1, $count = count($array); $i < $count; ++$i) { $array[$i] = array_diff_assoc( $array[$i], ...array_slice($array, 0, $i, true) ); } var_export($array);
Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
array ( 0 => array ( 'a' => 'b', 'c' => 'd', 'h' => 'e', 'i' => 'm', ), 1 => array ( 'f' => 'g', 'c' => 'f', ), 2 => array ( 'a' => 'd', ), 3 => array ( ), )
preferences:
79.94 ms | 407 KiB | 5 Q