PHP Manual: ldap_first

function ldap_first_attribute(LDAP\Connection $ldap, LDAP\ResultEntry $entry): string|false

Gets the first attribute in the given entry. Remaining attributes are retrieved by calling ldap_next_attribute() successively.

Similar to reading entries, attributes are also read one by one from a particular entry.

Returns the first attribute in the entry on success and false on error.

Version	Description
8.1.0	The `ldap` parameter expects an LDAP\Connection instance now; previously, a valid `ldap link` resource was expected.
8.1.0	The `entry` parameter expects an LDAP\ResultEntry instance now; previously, a valid `ldap result entry` resource was expected.
8.0.0	The unused third parameter `ber_identifier` is no longer accepted.

ldap_first_attribute