<?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);
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