(PHP 4, PHP 5, PHP 7)

ldap_explode_dn Aufteilung eines DN in seine Bestandteile


array ldap_explode_dn ( string $dn , int $mit_merkmal )

Die ldap_explode_dn() Funktion wird benutzt um einen von ldap_get_dn() gelieferten DN aufzuteilen und in dessen Bestandteile zu zerlegen. Jeder Teil wird als Relative Distinguished Name, RDN, bezeichnet. ldap_explode_dn() liefert einen Array mit allen diesen Bestandteilen. Der Parameter mit_merkmal wird benutzt, um zu bestimmen, ob die RDNs nur mit Werten oder zusätlich mit ihren Merkmalen angefragt werden. Um RDNs mit Merkmalen (z.B. Merkmal = Wert Format) zu erhalten, setzen Sie mit_merkmal auf 0, um nur Werte zu erhalten auf 1.

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User Contributed Notes 4 notes

hello+php at NOSPAM dot renoirboulanger dot com
4 years ago
I came accros this page and enjoyed the comments.

Since a LDAP string can sometimes be lengthy and have many attributes, I needed to be able to sort through all that is in.

In my case, I needed to get the subdomain part and other parameters.

Here is how I built my method.
     * Parse, and format a DN string to Array
     * Read a LDAP DN, and return an array keys
     * listing all similar attributes.
     * Also takes care of the character escape and unescape
     * Example:
     * CN=username,OU=UNITNAME,OU=Region,OU=Country,DC=subdomain,DC=domain,DC=com
     * Would normally return:
     * Array (
     *     [count] => 9
     *     [0] => CN=username
     *     [1] => OU=UNITNAME
     *     [2] => OU=Region
     *     [5] => OU=Country
     *     [6] => DC=subdomain
     *     [7] => DC=domain
     *     [8] => DC=com
     * )
     * Returns instead a manageable array:
     * array (
     *     [CN] => array( username )
     *     [OU] => array( UNITNAME, Region, Country )
     *     [DC] => array ( subdomain, domain, com )
     * )
     * @author gabriel at hrz dot uni-marburg dot de 05-Aug-2003 02:27 (part of the character replacement)
     * @author Renoir Boulanger
     * @param  string $dn          The DN
     * @return array
function parseLdapDn($dn)
$parsr=ldap_explode_dn($dn, 0);
//$parsr[] = 'EE=Sôme Krazï string';
        //$parsr[] = 'AndBogusOne';
$out = array();
$parsr as $key=>$value){
FALSE !== strstr($value, '=')){
$prefix,$data) = explode("=",$value);
$data=preg_replace("/\\\\\\([0-9A-Fa-f]{2})/e", "''.chr(hexdec('\\\\1')).''", $data);
$current_prefix) && $prefix == $current_prefix){
$out[$prefix][] = $data;
                } else {
$current_prefix = $prefix;
$out[$prefix][] = $data;
gabriel at hrz dot uni-marburg dot de
13 years ago
Keep attention on UTF8 encoded DNs. Since openLDAP >=2.1.2
ldap_explode_dn turns unprintable chars (in the ASCII sense, UTF8
encoded) into \<hexcode>.


$dn="ou=Universität ,c=DE";


array(3) {
  string(19) "ou=Universit\C3\A4t"
  string(4) "c=DE"

Unfortunately, PHP don't support the ldap functions ldap_str2dn and
ldap_dn2str, but by means of preg_replace a workaround is possible to
recover the old behaviour of ldap_explode_dn

// workaround
function myldap_explode_dn($dn,$with_attribute){

$result=ldap_explode_dn ($dn, $with_attrib);
//translate hex code into ascii again
    foreach($result as $key=>$value){
          $result[$key]=preg_replace("/\\\([0-9A-Fa-f]{2})/e", "''.chr(hexdec('\\1')).''", $value);

//then follows for the example

$dn="ou=Universität ,c=DE";


array(3) {
  string(15) "ou=Universität"
  string(4) "c=DE"
DavidSmith at byu dot net
13 years ago
[ Editor's Note: The segfault has been fixed and will not occur in PHP 4.3.4 or PHP 5.0.0 when they are released.  However, it is still important to escape special characters as detailed below. ]

If your DN contains < or > characters, you must escape them with a backslash or ldap_explode_dn() will give you a "wrong parameter count" error or even a segmentation fault.

For example, these calls will fail with a "wrong parameter count" or a seg fault:

  ldap_explode_dn( "cn=<bob>,dc=example,dc=com", 0 );
  ldap_explode_dn( 'cn=<bob>,dc=example,dc=com', 0 );

But this will succeed

  ldap_explode_dn( "cn=\<bob\>,dc=example,dc=com", 0 );

Notice also that the < and > are escaped with hex codes as noted above. This function is a nice wrapper that properly formats all DNs and can safely be called with < and > characters, and UTF-8 characters:

function my_explode_dn( $dn, $with_attributes=0 )
        $dn = addcslashes( $dn, "<>" );
        $result = ldap_explode_dn( $dn, $with_attributes );
        //translate hex code into ascii again
        foreach( $result as $key => $value )
                $result[$key] = preg_replace("/\\\([0-9A-Fa-f]{2})/e", "''.chr(hexdec('\\1')).''", $value);
        return $result;

I am using php 4.3.1. Good luck!
bs at muekno dot de
15 years ago
Copying is much better than typing!!!!
Just modify the constants.
Best wishes (and thanX 4 this helpfull site),
Bernd Schwaegerl
Mueller-Knoche GmbH, Systemhaus fuer EDV-Loesungen

# Example:

$HOST = "Yourhostname";
$USER_DN = "Yourldapuser_dn";
$PWD = "Ldapuserpassword";
$BASE_DN = "o=Your_organisation";



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