How to check if your PHP support TLS V1.2?

Run this script to see your SSL Version

tls_version;
?>

If you want to check your open SSL version?

OpenSSL 1.0.1 and later support  TLS v1.1 and TLS v1.2

If you see your OpenSSL version from 1.0.1, then it will support TLS V1.1 and TLS V1.2