Online PHP editor | refs for mV4nM

<?php $a = array( array( 'id' => 15, 'name' => 'John', 'color' => 'red', ), array( 'id' => 22, 'name' => 'Elise', 'color' => 'blue', ), array( 'id' => 30, 'name' => 'Mark', 'color' => 'red', ), ); $b = array( array( 'id' => 15, 'name' => 'Nancy', 'color' => 'black', ), array( 'id' => 20, 'name' => 'Elise', 'color' => 'blue', ), array( 'id' => 30, 'name' => 'Mark', 'color' => 'red', ), array( 'id' => 40, 'name' => 'John', 'color' => 'orange', ), ); function compare_ids($a, $b) { return ((bool)($a['id'] - $b['id'])); } print_r(array_intersect_uassoc($a, $b, "compare_ids"));