How to fix SMTP email authentication error in PHP

When I was sending email using Gmail SMTP authentication details, I got the below error. 

Error: 
SMTP -> ERROR: Failed to connect to server: Unable to find the socket transport "ssl" - did you forget to enable it when you configured PHP? (67373824)
SMTP Error: Could not connect to SMTP host. SMTP Error: Could not connect to SMTP host.

Solution:
Check openssl module enabled or not in your PHP configuration. If openssl module doesn’t enable, enable openssl module in PHP configuration file.

Open php.ini file and search “php_openssl.dll” then you will see like this code - 
;extension=php_openssl.dll

So enable this by remove symbol " ; " before extension like -
extension=php_openssl.dll

and save file.After restart your http server by server httpd restart command. Don’t forget to restart your web server after enabled module, otherwise it doesn’t take any effect.

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