php soapClient证书调用https开头的webservice失败有关问题解决方案

这几天做了服务器的php版本升级，由5.4升级到5.6.19，其他部分都没问题，结果发现https的webservice证书调用失败，报：failed to load external entity错误，代码都没动过，初步判断升级后导致的，于是本地还原到5.4 果然又好使了。

以前调用代码为：

$params = array('id' => '2');

	$local_cert = "./client-cer.pem";
 	set_time_limit(0);
 	try{
 		//ini_set("soap.wsdl_cache_enabled", "0"); // disabling WSDL cache
 		$wsdl='https://192.168.1.146:8443/pro/ws/getInfoService?wsdl';
 	//	echo file_get_contents($wsdl);
 		
 		$soap=new SoapClient($wsdl, 
	 				array(
	 					'trace'=>true,
		 				'cache_wsdl'=>WSDL_CACHE_NONE, 
		 				'soap_version'   => SOAP_1_1, 
		 				'local_cert' => $local_cert, //client证书信息
		                'passphrase'=> 'client', //密码
		               // 'allow_self_signed'=> true
	                )
				);
 		$result=$soap->sayHello($params);
 		$result_json= json_encode($result);
 		$result= json_decode($result_json,true);
 		echo '结果为:' . json_decode($result['return'],true);
 	}catch(Exception $e) {
 		$result['success'] = '0';
 		$result['msg'] = '请求超时';
 		echo $e->getMessage();
 	}
	echo '>>>>>>>>>>>';

根据官方解释如下：

After migrating to PHP 5.6.5, the soap 1.2 did not work anymore. So I solved the problem by adding optional parameters SSL.
My error: failed to load external entity
How to solve:
        // options for ssl in php 5.6.5
        $opts = array(
            'ssl' => array('ciphers'=>'RC4-SHA', 'verify_peer'=>false, 'verify_peer_name'=>false)
        );
        // SOAP 1.2 client
        $params = array ('encoding' => 'UTF-8', 'verifypeer' => false, 'verifyhost' => false, 'soap_version' => SOAP_1_2, 'trace' => 1, 'exceptions' => 1, "connection_timeout" => 180, 'stream_context' => stream_context_create($opts) );
        $oSoapClient = new SoapClient ( $url . "?WSDL", $params );

 所以更改代码为：

$opts = array (
			'ssl' => array (
					'ciphers' => 'RC4-SHA',
					'verify_peer' => false,
					'verify_peer_name' => false 
			) 
	);
	// SOAP 1.2 client
	$params = array (
			'encoding' => 'UTF-8',
			'verifypeer' => false,
			'verifyhost' => false,
			'soap_version' => SOAP_1_1,
			'trace' => 1,
			'exceptions' => 1,
			"connection_timeout" => 180,
			'stream_context' => stream_context_create ( $opts ),
			'local_cert' => $local_cert, // client证书信息
			'passphrase' => 'client'  // 密码
		);

	;
	$soap = new SoapClient ( $wsdl, $params );

  开始按这个做也报错，后来把soap_1_2更改为soap_1_1 好使了