SOAP-ERROR:解析 WSDL:无法从“https”加载

为什么不能加载PHP的外部SOAP实体？错误：肥皂错误：解析 WSDL：无法从

我的第一个想法：php可以接受外部https文档吗？

Fatal error: Uncaught SoapFault exception: [WSDL] SOAP-ERROR: Parsing WSDL: Couldn't load from 'https://soatest.paysafecard.com/psc/services/PscService?wsdl' :
failed to load external entity "https://soatest.paysafecard.com/psc/services/PscService?wsdl" in /var/www/virtual/example.com/htdocs/class.php:791
    Stack trace: 
     #0 /var/www/virtual/example.com/htdocs/class.php(791): SoapClient->SoapClient('https://soatest...')
     #1 /var/www/virtual/example.com/htdocs/class.php(25): SOPGClassicMerchantClient->clientConnect() 
     #2 /var/www/virtual/example.com/htdocs/payment.php(56): SOPGClassicMerchantClient->__construct(true, 'de', true, 'test') 
     #3 {main} thrown in /var/www/virtual/example.com/htdocs/class.php on line 791

PHP信息

soap
Soap Client enabled
Soap Server enabled
Directive   Local Value Master Value
soap.wsdl_cache 1   1
soap.wsdl_cache_dir /tmp    /tmp
soap.wsdl_cache_enabled 1   1
soap.wsdl_cache_limit   5   5
soap.wsdl_cache_ttl 86400   86400
openssl
OpenSSL support enabled
OpenSSL Library Version OpenSSL 0.9.8o 01 Jun 2010
OpenSSL Header Version  OpenSSL 0.9.8o 01 Jun 2010