ldap error

I get this error when I try and run the application from the server, using the production web server. However when I run the application locally using the built in web server , it works fine, and authenticates via ldap. I'm using phph runner 6.1, IIS and mysql. here is the error again. Fatal error: Call to undefined function ldap_connect() in E:\Web\PHP\phproot\Communications_Plan\output\classes\runnerldap.php on line 23

Please help. also here is a copy of the runnerldap.php file that it refers to.
<?php

/**

• Class for display admin_rights_list
  
  
  
  /
  
  class RunnerLdap
  
  {
  
  var $ldap_domainName = '';
  var $ldap_serverIP = NULL;
  var $ldapconn = null;
  var $ldapbind = null;
  function RunnerLdap($aDomainName,$aServerIP){
  
  $this->ldap_domainName = $aDomainName;
  
  $this->ldap_serverIP = $aServerIP;
  
  }
  function runner_ldap_connect($aUsername,$aPassword){
  
  // connect to ldap server
  
  $this->ldapconn = ldap_connect("ldap://".$this->ldap_serverIP);
  
  if (!$this->ldapconn || ldap_errno($this->ldapconn)!=0)
  
  return false;
  
  @ldap_set_option($this->ldapconn, LDAP_OPT_PROTOCOL_VERSION, 3);
  
  ldap_set_option($this->ldapconn, LDAP_OPT_REFERRALS, 0);
  
  // binding to ldap server
  
  $this->ldapbind = @ldap_bind($this->ldapconn, $aUsername."@".$this->ldap_domainName, $aPassword);
  
  if(!$this->ldapbind)
  
  return false;
  
  return true;
  
  }
  /**
  
  • Search LDAP tree
    
  • @ An LDAP link identifier, returned by ldap_connect()
    
  • @ string The search filter
    
  • @ array An array of the required attributes
    
    /
    
    function runner_ldap_getData($filter,$attributes=array()){
    
    $ldap_dn = $this->ldap_DomainToDN($this->ldap_domainName);
    
    if (sizeof($attributes)) {
    
    $query = ldap_search($this->ldapconn, $ldap_dn, $filter);
    
    }else {
    
    $query = ldap_search($this->ldapconn, $ldap_dn, $filter, $attributes);
    
    }
    
    // Read all results from search
    
    $entries = ldap_get_entries($this->ldapconn, $query);
    
    return $this->runner_convert_entries($entries);
    
    //return $entries;
    
    }
    function runner_convert_entries($aData){
    $resultArr = array();
    
    if (!sizeof($aData)) {
    
    return null;
    
    }
    for ($j=0;$j<$aData['count'];$j++){
    
    $result = array();
    
    foreach ($aData[$j] as $key=>$val){
    
    if (is_numeric($key))
    
    continue;
    
    if ($val["count"] > 1 || $key == 'memberof'){
    
    //set array
    
    $tmpResult = array();
    
    for ($i=0;$i<$val['count'];$i++){
    
    $tmpResult[] = $val[$i];
    
    }
    
    $result[$key] = $tmpResult;
    
    }
    
    else if ($key=='dn'){
    
    $result[$key] = $val;
    
    }
    
    else {
    
    $result[$key] = $val[0];
    
    }
    
    }
    
    $resultArr[] = $result;
    
    }
    return $resultArr;
    
    }
    /
    
  • Convert domain name test.xlinesoft.com
    
  • return DC=test,DC=xlinesoft,DC=com
    
    /
    
    function ldap_DomainToDN($aDomain){
    
    $arrDomain = explode(".",$aDomain);
    
    for ($i=0;$i<sizeof($arrDomain);$i++){
    
    $arrDomain[$i] = "dc=".$arrDomain[$i];
    
    }
    
    return implode(',',$arrDomain);
    
    }
    function runner_ldap_unbind(){
    
    ldap_unbind($this->ldapconn);
    
    }
    
    function ldap_error(){
    
    return ldap_err2str(ldap_errno($this->ldapconn));
    
    }
    
    //function for Active Directory
    
    /
    
  • This function retrieves and returns CN from given DN
    
  • $dn = CN=Users,CN=Builtin,DC=test,DC=xlinesoft,DC=com
    
  • return Users
    
    /
    
    function ldap_getCN($dn) {
    
    preg_match('/[^,]/', $dn, $matchs, PREG_OFFSET_CAPTURE, 3);
    
    return $matchs[0][0];
    
    }
    /*
    
  • This function searchs in LDAP tree ($ad -LDAP link identifier)
    
  • entry specified by samaccountname and returns its DN or epmty
    
  • string on failure.
    
  • $samaccountname = Users
    
  • $basedn = DC=test,DC=xlinesoft,DC=com
    
  • return CN=Users,CN=Builtin,DC=test,DC=xlinesoft,DC=com
    
    */
    
    function ldap_getDN($ad, $samaccountname, $basedn) {
    
    $attributes = array('dn');
    
    $result = ldap_search($ad, $basedn,
    
    "(samaccountname={$samaccountname})", $attributes);
    
    if ($result === FALSE) { return ''; }
    
    $entries = ldap_get_entries($ad, $result);
    
    if ($entries['count']>0) { return $entries[0]['dn']; }
    
    else { return ''; };
    
    }
    function getGroupSid($userSid, $primaryGroupId)
    
    {
    
    $tgroup = bin2hex(substr($userSid,0, strlen($userSid)-4));
    
    $group="";
    
    for($i = 0; $i<strlen($tgroup); $i += 2)
    
    {
    
    $group .= '\\'.substr($tgroup,$i,2);
    
    }
    
    $group .= sprintf("\\%02x",$primaryGroupId & 255);
    
    $group .= sprintf("\\%02x",($primaryGroupId >>8) & 255);
    
    $group .= sprintf("\\%02x",($primaryGroupId >>16) & 255);
    
    $group .= sprintf("\\%02x",($primaryGroupId >>24) & 255);
    
    return $group;
    
    }
    
    }