Fatal error: Call to undefined function openssl_random_pseudo_bytes()
Your version of PHP wasn't compiled with the openssl module. If you are building from source, add the module like so:
cd /path/to/php-5.4/
./configure --with-openssl
Fatal error: Call to undefined function openssl_random_pseudo_bytes()
The OpenSSL Perl modules you found are a red herring. They have no effect whatsoever on PHP. (PHP and Perl are two entirely separate programming languages.)
What you need to install is the openssl PHP module. I don't recall exactly whether cPanel has an option to rebuild PHP, but if I'm right and it does, you'll need to go through that process and enable OpenSSL there.
Fatal error: openssl_random_pseudo_bytes
FIXED! Switched to PHP 7.0.9 and there is no such problem.
OpenSSL installed but not working
You need to upgrade PHP to version >= 5.3.
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