Search within nested array

Question

How can I check if a value is in an array when the array is nested? Seems to be that my attempt is't the right way to do that as it doesn't return a match.

$hash='0ec29d9cdb18f1e11cf0d5f515025350';
if (in_array($hash, $array)) { echo "Found it!"; }

var_dump($array);

array(2) { [0]=> array(1) {
["hash"]=> string(32) "0ec29d9cdb18f1e11cf0d5f515025350" } 
[1]=> array(1) {
["hash"]=> string(32) "5082227aa45743157ae557ca49b56d36" }
}