How to check if a value is equal to associative array value?

Question

how can I solve this:

$a = array(9, 10, 11, 12, 13);
$b = array(
    array("item" => 10),
    array("item" => 13)
);

I want to check what $a values exist in $b['item']. in_array and array_key_exists cannot help me :(

Thanks!

Answer 1

Using a foreach loop will do the work for you.

$not_in_b = array();

foreach($b as $row)
{ 
    if(!in_array($row['item'], $a) 
    {
        $not_in_b[] = $row['item'];
    }
}

Answer 2

Try this:

foreach($b as $item){
     if(!in_array($item['item'], $a){
          echo $item['item'].' is not array $a'; //or do whatever it is you want to do.
     }
}