This function will return an array of the attributes which the specified
objectClass requires based on what you have defined in your slapd.oc.conf file.
Example:
$ldap = new LDAP();
$oc = "organizationalUnit";
$required = $ldap->getRequires($oc);
echo "ObjectClass '$oc' requires the following attributes:<br>";
for ($ctr = 0; $ctr < count($required); $ctr++)
{
echo $required[$ctr] . "<br>\n";
}