function to simulate left join on array not working properly in PHP

Question

I have two arrays like this :

$left = [
    [\'UserID\' => 6835406],
    [\'UserID\' => 8418097],
];

$right = [
    [\'Amount\' => 0.00, \'UserID\' =&g         


        

Answer 1

I don't know why you did so long code, do like below:

$finalArray = array();
foreach($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;
        }
    }
}
$finalArray = array_values($finalArray);

var_dump($finalArray);

Output:-https://3v4l.org/TCnBb

You can go for functional approach too:https://3v4l.org/aLWij