amazon-web-services browser mysql php ssl

PHP connection to remote mysql with ssl works via command but not in browser

I want to connect to a remote (AWS) mysql server using ssl in PHP.

My script works when I execute it via command line, but doesn’t when I call it from the browser.

$link = mysqli_real_connect($con, "host", "username", "password");

I am using php7/Apache/CentOs. I tried changing the ownership and permissions of the CA file, and noticed that it requires read permission the be executed on console. But in browser even if I give full permission to everybody (chmod 777) it still doesn’t work.

The error i get is:
Warning: failed loading cafile stream.
When I check existence of file it returns true, but when I check is_readible, then also error.

Can somebody help?Thanks!