Question

How do i check if a specific array key exist and how to compare them?

1. Array looks like this.

[33] => Array
               (
                   [211] =>objectr
                       (
                           [name] => Test
                           [id]=>  211
                    )
               )

[23] => Array
               (
                   [311] =>objectr
                       (
                           [name] => Tester
                           [id]=>  311
                    )
               )

2. Array looks like this

   [0] => 311
   [1] => 211
   [2] => 99

Now i need to compare them and get the id of them.

What im looking for is something like that

   [0] => Tester
   [1] => Test

How do i do that?

Answer 1

array_key_exists – http://php.net/manual/en/function.array-key-exists.php

foreach($first_array as $arr) {
    foreach($second_array as $key=>$val)
    {
        if (array_key_exists($val, $first_array)) {
            $final_array[$key] = $arr['name'];
        }
    }
}

or array_search – http://uk.php.net/array_search

foreach($first_array as $arr) {
    foreach($second_array as $val)
    {
        $key = array_search($val, $arr);
        if($key !== false) $final_array[$key] = $arr['name'];
    }
}

In both cases you should end up with:

   [0] => Tester
   [1] => Test