Is $subject available for $access_level?

gistfile1.php

<?php

function isSubjectAvailableToRole($subject, $access_level) {
  	// 9   - Expert
  	// {N} - {Role}
	$denied = array(
		9 => array('price')
	);

	return ! in_array($subject, $denied[$access_level]);
}

var_dump(isSubjectAvailableToRole('price', 9)); // bool(false)
var_dump(isSubjectAvailableToRole('video_field', 9)); // bool(true)
var_dump(isSubjectAvailableToRole('price', 2)); // bool(true)