How to solve "SSL3_GET_SERVER_CERTIFICATE:certificate verify failed"; also, how to upgrade to PHP 7 from 5?

I'm running phpBB3, and when it tries to send an email I get this error: 
SSL3_GET_SERVER_CERTIFICATE:certificate verify failed

I tried getting help in #phpbb and on their message board, but nobody 
could help me. I think this is probably more a problem with my PHP setup 
than with phpBB3 specifically anyway.

The line that it reports the error at is this:

$smtp->socket = fsockopen($config['smtp_host'], $config['smtp_port'], 
$errno, $errstr, 20);

Could that be an actual OpenSSL/certificate issue, or does that just 
mean that php can't open internet sockets?

Someone suggested to me that maybe the server uses a self-signed 
certificate or that the certificate doesn't exist on my Windows box, but 
the server is AT&T - specifically outbound.att.net - wouldn't that be 
big enough that I wouldn't have those problems? Also, I've gotten this 
problem with several other SMTP servers I've tried. I've never been able 
to connect to a single one out of about 5-6 I tried, with dozens of 
variations of connection settings, though error messages varied.. I've 
gotten about 5 different error messages, though "certificate verify 
failed" was by far the most common.

Should I try to get the server's certificate somehow and put that in my 
system manually? If so, how do I get the server's certificate and how do 
I put it in my system?

Also, I don't know if it matters, but the command 'php -r 
"print_r(openssl_get_cert_locations());"' returns this:

Array
(
     [default_cert_file] => c:/usr/local/ssl/cert.pem
     [default_cert_file_env] => SSL_CERT_FILE
     [default_cert_dir] => c:/usr/local/ssl/certs
     [default_cert_dir_env] => SSL_CERT_DIR
     [default_private_dir] => c:/usr/local/ssl/private
     [default_default_cert_area] => c:/usr/local/ssl
     [ini_cafile] =>
     [ini_capath] =>
)

and c:\usr isn't a directory on my system. Is that something I have to 
change, and if so, how?

I hesitate to give the full error phpBB3 error message because that 
might make people think this is really a phpBB3 question, but since it 
may be useful, here it is:

Errno 2: fsockopen(): SSL operation failed with code 1. OpenSSL Error 
messages:
error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate 
verify failed at [ROOT]/includes/functions_messenger.php line 1005<br />
Errno 2: fsockopen(): Failed to enable crypto at 
[ROOT]/includes/functions_messenger.php line 1005<br />
Errno 2: fsockopen(): unable to connect to ssl://outbound.att.net:465 
(Unknown error) at [ROOT]/includes/functions_messenger.php line 1005

--

I did try upgrading to the latest version of PHP 5 (just today), but 
maybe I should upgrade to PHP 7? Amazingly I can't find any webpages 
that explain how to do that, though. Do I just copy over all the files 
and then copy over my old php.ini? Or would it be incompatible, and if 
so, what's different / how do I migrate my settings?








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