# ldap_connect

(PHP 4, PHP 5, PHP 7)

ldap_connect — Connect to an LDAP server

### Description

ldap_connect ([ string `$ldap_uri` = `NULL` ] ) : resource
Warning

The following signature is still supported for backwards compatibility, but is considered deprecated and should not be used anymore!

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

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 plausible and can be used to open a connection as soon as one is needed.

### Parameters

`ldap_uri`

  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.

`host`

  The hostname to connect to.

`port`

  The port to connect to.

### Return Values

Returns a positive LDAP link identifier when the provided LDAP URI seems plausible. It's a syntactic check of the provided parameter but the server(s) will not be contacted! If the syntactic check fails it returns `FALSE`. ldap_connect() will otherwise 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 argument is specified then the link identifier of the already opened link will be returned.

### Examples

Example #1 Example of connecting to LDAP server.

`<?php
// LDAP variables
$ldapuri = "ldap://ldap.example.com:389"; // your ldap-uri
// Connecting to LDAP
$ldapconn = ldap_connect($ldapuri)
or die("That LDAP-URI was not parseable");
?>`

Example #2 Example of connecting securely to LDAP server.

`<?php
// 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("That LDAP-URI was not parseable");
?>`

### See Also

- ldap_bind() - Bind to LDAP directory