Returns a positive LDAP link identifier on success, or
FALSE on error.
ldap_connect() establishes a
connection to a LDAP server on a specified hostname and
port. Both the arguments are optional. If no
arguments are specified then the link identifier of the
already opened link will be returned. If only hostname is specified, then the port
defaults to 389.
If you are using OpenLDAP 2.x.x you can specify a URL
instead of the hostname. To use LDAP with SSL, compile
OpenLDAP 2.x.x with SSL support, configure PHP with SSL, and
use ldaps://hostname/ as host parameter. The port parameter
is not used when using URLs.
注: URL and SSL support were added in 4.0.4.