I had a request to create an Intranet PhoneBook searchable via a browser...
Having Exchange 5.5 with the LDAP services running, I found some example code
on how to use the LDAP functions at php.net/ldap and started hacking...
 took about 20min...

 
I didn't include the Search Form....

function phoneBook($person)
{
    if(!$this-> person) {
      print "You must search for something!!...";
      print "< br> < A HREF=phonebook.php> Back to Form< /A> ";
      die();
    } else {
    //  Setup connection to server
    // I'm using this function to connect to Exchange 5.5 
    $ds=ldap_connect("");  // must be a valid LDAP server!
    $dn = "o=PCCS-Linux, c=US";

    // We want to search for a person
    // this can be any portion of the name first or last
    $filter="(|(sn=$person*)(givenname=$person*))";
    $justthese = array( "ou", "sn", "givenname", "mail","telephonenumber");

    // Execute the search
    $sr=ldap_search($ds, $dn, $filter, $justthese);

    // Put the results into an array called info
    $info = ldap_get_entries($ds, $sr);

    // Format the results that are returned
    // $info[$1]["valuetoreturn"][0]
    print "< center> ";
    print "< H2> < font color=navy> ".$info["count"]."< /font>  entries
returned< /H2> ";
    print "< table border=0 cellpadding=2 cellspacing=1> ";
    print "< tr> < th>  < /th> < th align=left> Name< /th> <
th align=left> E-Mail< /th> < th align=left> Phone< /th> < /tr> ";
      for($i=0; $i <  count($info); $i++) {

        if($info[$i]["givenname"][0] == "") {
        //
        } else {
            print "< tr bgcolor=#FFFFFF> < td> ";
            print "< a HREF=mailto:".$info[$i]["mail"][0]."> < img
src=".SITE_IMAGES."/sendemail.gif border=0> < /a> < /td> < td> ";
            print $info[$i]["givenname"][0]." ".$info[$i]["sn"][0];
            print "< /td> < td> ";
            print $info[$i]["mail"][0];
            print "< /td> < td> ";
            print $info[$i]["telephonenumber"][0];
            print "< /td> < /tr> ";
        }
      }
    }
   print "< /table> ";
   print "< P> ";

   print "< /center> ";


} // End phoneBook

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