Return the LDAP error number of the last LDAP command
for this link.
This function returns the standardized error number
returned by the last LDAP command for the given link_identifier. This number can be
converted into a textual error message using
ldap_err2str().
Unless you lower your warning level in your php.ini sufficiently or prefix your LDAP
commands with @ (at) characters to suppress warning output,
the errors generated will also show up in your HTML
output.
See also ldap_err2str() and
ldap_error().