如果开了调试，调试进去会看到错误提示：

 

[cpp] view plain copy

 

smtp_code:"stream_socket_enable_crypto(): SSL operation failed with code 1. OpenSSL Error messages:\nerror:14090086:SSL routines:ssl3_get_server_certificate:certificate verify failed"  

最终提示是：Could not connect to SMTP host

 

原因是升到php5.6后默认开启验证

添加参数，去掉验证：

 

[php] view plain copy

 

$mail->SMTPOptions = array(  

    'ssl' => array(  

        'verify_peer' => false,  

        'verify_peer_name' => false,  

        'allow_self_signed' => true,  

    )  

)  

 

 

参考文档：

http://php.net/manual/en/context.ssl.php

去掉验证：

I am unable to load a PEM that was generated with the stunnel tools. However, I am able to use PHP calls to generate a working PEM that is recognized both by stunnel and php, as outlined here:http://www.devdungeon.com/content/how-use-ssl-sockets-phpThis code fragment is now working for me, and with stunnel verify=4, both sides confirm the fingerprint. Oddly, if "tls://" is set below, then TLSv1 is forced, but using "ssl://" allows TLSv1.2:$stream_context = stream_context_create([ 'ssl' => ['local_cert'        => '/path/to/key.pem','peer_fingerprint'  => openssl_x509_fingerprint(file_get_contents('/path/to/key.crt')),'verify_peer'       => false,'verify_peer_name'  => false,'allow_self_signed' => true,'verify_depth'      => 0 ]]);$fp = stream_socket_client('ssl://ssl.server.com:12345',   $errno, $errstr, 30, STREAM_CLIENT_CONNECT, $stream_context);fwrite($fp, "foo bar\n");while($line = fgets($fp, 8192)) echo $line;

 

http://php.net/manual/en/context.ssl.php

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