Online PHP editor | refs for qTSiL

<?php function position_merge(array $arr1,array $arr2) { function addIndex(&$item,$idx) { $item["array_index"]=$idx; } function rmIndex(&$item) { unset($item["array_index"]); } array_walk($arr1,"addIndex"); array_walk($arr2,"addIndex"); $result=array_merge($arr1,$arr2); usort($result,function($a,$b){ return $a["position"]>$b["position"]?1:($a["position"]<$b["position"]?-1:$a["array_index"]-$b["array_index"]); }); array_walk($result,"rmIndex"); return $result; } $array1 = array( array('name' => 'Bob', 'position' => 1), array('name' => 'Tim', 'position' => 1), array('name' => 'Alf', 'position' => 3), array('name' => 'Jon', 'position' => 3) ); $array2 = array( array('name' => 'Tom', 'position' => 2), array('name' => 'Joe', 'position' => 2), array('name' => 'Jim', 'position' => 2), array('name' => 'Kev', 'position' => 2) ); print_r(position_merge($array1,$array2));