In centos, php Curl cannot access https. ssl_version is NSS rather than openssl.

First, determine whether php has installed extension curl and openssl. If not, skip this step...

View phpinfo. If curl is found, the curl 7.19.7 libcurl/7.19.7 NSS/3.19.1 Basic ECC (instead of openssl) will be found)

Because centos 6.5 (the version I used is not tested in other versions), the default installation of curl is that the ssl version is NSS.

Therefore, you need to recompile the Curl.

Go to the official download http://curl.haxx.se/download/archeology/ I still download version 7.19.7, recompile

./Configure -- prefix =/usr -- without-nss -- with-ssl

Make & make install

Ldconfig

Check curl-V curl 7.19.7 libcurl/7.19.7 OpenSSL/1.0.1e. openssl can access the https website.

Of course php is valid and httpd needs to be restarted

OK... Done