PHP在用SOAP协议做接口的时候，经常会碰到如下问题,不是不成功，而是偶尔不成功，实在让人费解！
ERR: SOAP-ERROR: Parsing WSDL: Couldn't load from 'http://www.xxxxx.com/member/member_sync.php?wsdl' : failed to load external entity "
查找日志发现：
NOTIC: [2] SoapClient::SoapClient(): I/O warning : failed to load external entity "http://www.xxxxx.com/member/member_sync.php?wsdl" /home/wwwroot/default/xxxxx.com/App/Modules/Admin/Action/OrderAction.class.php 第 112 行.客户端$client = new SoapClient ( $url );创建SoapClient对象时出错！
网上查找很多资料，有开启selinux、关闭soap缓存、开启openssl等等答案，但尝试过后都不尽人意，现终极解决办法：
只需把php的客户端SoapClient的wsdl模式修改为non-wsdl模式，即可解决!
wsdl模式：
<?php
$url = "http://xxxxx.org/member/member_sync.php?wsdl";
$client = new SoapClient ( $url );
$arr = array (
'username' => 'test123',
'company' => '深圳市xxxxx科技有限公司',
'password' => md5 ( md5 ( "test123" ) ),
'encrypt_code' => 'thisisencryptcode' ); //加密串，必须
$result = $client->common_func ( 'sync_member', json_encode ( $arr ) );
var_dump ( $result );
?>
non-wsdl模式：
<?php
$client = new SoapClient(null,array('location'=>'http://www.xxxxx.com/member/member_sync.php',uri => 'member_sync.php'));
$arr = array (
'username' => 'test123',
'company' => '深圳市xxxxx科技有限公司',
'password' => md5 ( md5 ( "test123" ) ),
'encrypt_code' => 'thisisencryptcode' ); //加密串，必须
$result = $client->common_func ( 'sync_member', json_encode ( $arr ) );
var_dump ( $result );
?>