... 3.0.13 - 3.0.18 only, PHP 4 >= 4.0.0) ldap_err2str -- Convert LDAP error number into string error message . string ldap_err2str ( int errno) . ... This function returns the string error message explaining the error number errno . While LDAP errno numbers are standardized, different libraries return different or even localized textual error messages. Never check for a specific error message text, but always use an error number to check. See also ldap_errno() and ldap_error() . ...