PHP Fatal error: Call to undefined function: ldap_connect()

I keep getting a fatal error with my LDAP connect to Active Directory.  This should be a no brainer but I'm at a loss...

I have a phone book written in PHP.  It calls on a function file.  This use to work and the guy who coded this left the company.  I used a couple of editing programs and still can't figure it out...  I replace real server IP with a fake one & fake account info.  Here's the code:


# define action constants
define( INITIALIZE, 0 );
define( SEARCH, 1 );

function connect_to_server() {

      $ldaphost = "";
      $ldapport = 389;
      $ldaprdn = '';
      $ldappass = 'password';

      $ds=ldap_connect($ldaphost ,$ldapport)
            or die("Cannot connect to {$ldaphost}");
      if ($ds) {
            // binding to ldap server
            $ldapbind = ldap_bind($ds, $ldaprdn, $ldappass)
                  or die("LDAP bind failed...");
      return $ds;


Any help would be appreciated!  I need to have this fixed ASAP that's why I assigned a high point to this.  Thanks!

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Hi res4me,

Call to undefined function: ldap_connect() means LDAP probably isn't enabled on your webserver.

To check that it is enabled, run the script



and check to see if you have a section regarding LDAP. If you don't, you'll need to enable "extension=php_ldap.dll" in your php.ini file, as well as copying some DLL files as detailed here:

Hope this helps.


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