In the ABN webservice, need to get the ABN/ACN number using name search.

I used the below code for search by name. But it returns an error.

PHP Fatal error:  Call to undefined method stdClass::externalNameSearch() in /home/kaybsoln/public_html/kaybs.in/PHPSample/abnlookup.class.php on line 43

<?php


/**
 * @author Justin Swan - 16 August 2012
 * extends php soap client to utilize the Australian Government ABN Lookup web service 
 * requires php 5 or greater with lib-xml enabled/compiled in Apache, see the PHP manual for further requirements info
 * 
 * @link    http://www.php.net/manual/en/book.soap.php
 * @link    http://abr.business.gov.au/Webservices.aspx
 * 
 * @param string $guid - get a guid id by registering @ http://abr.business.gov.au/Webservices.aspx
 * 
 */
 
class abnlookup extends SoapClient{
 
    private $guid = "******************************"; 
 
    public function __construct($guid)
    {
        $this->guid = $guid;
        $params = array(
            'soap_version' => SOAP_1_1,
            'exceptions' => true,
            'trace' => 1,
            'cache_wsdl' => WSDL_CACHE_NONE
        ); 
 
        parent::__construct('http://abr.business.gov.au/abrxmlsearch/ABRXMLSearch.asmx?WSDL', $params);
    }
 
   public function searchByAbn($abn, $historical = 'N'){
		$params = new stdClass();
		$params->searchString				= $abn;
		$params->includeHistoricalDetails	= $historical;
		$params->authenticationGuid			= $this->guid;
		return $this->ABRSearchByABN($params);
	}

  public function searchByName($company_name){
        $params = new stdClass();
        $params->externalNameSearch($company_name);
        $params->authenticationGuid            = $this->guid;
        return $this->ABRSearchByName($params);
    }
 } 
$company_name = "A. & G. PTY LTD";
$abn_search_string = "74599608295"; // you can assign your post/get var or abn string here


try{
    $abnlookup = new abnlookup($abn_guid);
    try{
        $result = $abnlookup->searchByName($company_name); 
 
        // display all results
        echo "<pre>";
        print_r($result);
        echo "</pre>";
 
        // also display by variables using object notation.
        echo "<pre>";
        $result->ABRPayloadSearchResults->response;
        echo "</pre>";
 
    } catch    (Exception $e){
        throw $e;
    }
 
} catch(Exception $e){
    echo $e->getMessage();
}

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