A simple thing to do, but I forgot how to convert
Array ( [0] => Array ( [hashcode] => 952316176c1266c7ef1674e790375419
I know this is premature but since this is coming soon I figured I throw this out there. As of (the not yet released) PHP 5.5 you can use array_column():
$hashcodes = array_column($array, 'hashcode');