Online PHP editor | refs for aLWij

<?php $left = Array ( 0 => Array ( 'UserID' => 6835406 ), 1 => Array ( 'UserID' => 8418097 ), 2 => Array ( 'UserID' => 9889987 ), 3 => Array ( 'UserID' => 9899999 ) ); $right = Array ( 0 => Array ( 'Amount' => 0.00, 'UserID' => 6835406 ), 1 => Array ( 'Amount' => 0.00, 'UserID' => 8418097 ), 2 => Array ( 'UserID' => 9889987 ) ); function combineArray($left, $right){ $finalArray = array(); foreach($left as $lft){ foreach($right as $rgt){ if($lft['UserID'] == $rgt['UserID']){ $finalArray[$lft['UserID']]['UserID'] = $lft['UserID']; $finalArray[$lft['UserID']]['Amount'] = (isset($rgt['Amount']) ? $rgt['Amount'] : NULL); break; }else{ $finalArray[$lft['UserID']]['UserID'] = $lft['UserID']; $finalArray[$lft['UserID']]['Amount'] = NULL; } } } return $finalArray = array_values($finalArray); } var_dump(combineArray($left, $right));