LDAP Functions
PHP Manual


(PHP 4, PHP 5, PHP 7)

ldap_connectConnect to an LDAP server


resource ldap_connect ([ string $host = NULL [, int $port = 389 ]] )

Creates an LDAP link identifier and checks whether the given host and port are plausible.

Note: This function does not open a connection. It checks whether the given parameters are plausibe and can be used to open a connection as soon as one is needed.



This field supports using a hostname or, with OpenLDAP 2.x.x and later, a full LDAP URI of the form ldap://hostname:port or ldaps://hostname:port for SSL encryption.

You can also provide multiple LDAP-URIs separated by a space as one string

Note that hostname:port is not a supported LDAP URI as the schema is missing.


The port to connect to. Not used when using LDAP URIs.

Return Values

Returns a positive LDAP link identifier when the provided hostname/port combination or LDAP URI seems plausible. It's a syntactic check of the provided parameters but the server(s) will not be contacted! If the syntactic check fails it returns FALSE. When OpenLDAP 2.x.x is used, ldap_connect() will always return a resource as it does not actually connect but just initializes the connecting parameters. The actual connect happens with the next calls to ldap_* funcs, usually with ldap_bind().

If no arguments are specified then the link identifier of the already opened link will be returned.


Example #1 Example of connecting to LDAP server.


// LDAP variables
$ldaphost "ldap.example.com";  // your ldap servers
$ldapport 389;                 // your ldap server's port number

// Connecting to LDAP
$ldapconn ldap_connect($ldaphost$ldapport)
          or die(
"Could not connect to $ldaphost");


Example #2 Example of connecting securely to LDAP server.


// make sure your host is the correct one
// that you issued your secure certificate to
$ldaphost "ldaps://ldap.example.com/";

// Connecting to LDAP
$ldapconn ldap_connect($ldaphost)
          or die(
"Could not connect to {$ldaphost}");


See Also

LDAP Functions
PHP Manual