parseLdapDn

parseLdapDn

I had to work that out in PHP.

Since a LDAP string can sometimes be lengthy and have many attributes, I thought of contributing how I am using it in a project.

I wanted to use:
    
    CN=username,OU=UNITNAME,OU=Region,OU=Country,DC=subdomain,DC=domain,DC=com

And turn it into:
    
    array (
        [CN] => array( username )
        [OU] => array( UNITNAME, Region, Country )
        [DC] => array ( subdomain, domain, com )
    )


Here is how I built my method.

    /**
     * Read a LDAP DN, and return what is needed
     *
     * Takes care of the character escape and unescape
     *
     * Using:
     * 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';
        $out = array();
        foreach($parsr as $key=>$value){
            if(FALSE !== strstr($value, '=')){
                list($prefix,$data) = explode("=",$value);
                $data=preg_replace("/\\\([0-9A-Fa-f]{2})/e", "''.chr(hexdec('\\1')).''", $data);
                if(isset($current_prefix) && $prefix == $current_prefix){
                    $out[$prefix][] = $data;
                } else {
                    $current_prefix = $prefix;
                    $out[$prefix][] = $data;
                }
            }
        }
        return $out;
    }