Question

Here is the $haystack array:

Array
(
    [438] => stdClass Object
        (
            [w] => 438
            [x] => 0
            [y] => 438
            [z] => 23
        )

    [4960] => stdClass Object
        (
            [w] => 4960
            [x] => 0
            [y] => 4960
            [z] => 37
        )

)

Why does this not work? How can I tell $needle is in $haystack. I am getting this error stdClass could not be converted to int.

$needle = 438;
if(in_array($needle,$haystack)){
  echo "yes";
}else{
  echo "no";
}

Answer 1

Array Key Exists

Looks like the right way to go about this is to use the array_key_exists function.

As john and andreas have pointed out, you are looking for a key, not for a value. in_array searches array values.

<?php 
if(array_key_exists(438, $array)) { //found
  echo "yes";
}else{
  echo "no";
}

Documentation here: http://php.net/manual/en/function.array-key-exists.php