Fix curl_init() Undefined Function with php-curl and php7.3-curl on Debian Buster

What you're seeing from php -v doesn't reflect the application framework you're using (in this case, the Zend Framework). The problem more likely lies in the application-level code you're running, which appears to be a Zend Framework 1 app.

I had a very similar error in a ZF1 app that was using Doctrine for its ORM layer. In Doctrine's class loader, I had to add an extra check for PHP 7 to handle some ways in which PHP 7 changes variable interpretation. Around line 224 of library/Doctrine/Common/ClassLoader.php, I changed:

} else if ($loader[0]::$loader[1]($className)) { // array('ClassName', 'methodName')
    return true;
}

to:

} else if {
    if (substr(PHP_VERSION_ID, 0, 1) == '7') {
        $method = $loader[0] . '::' . $loader[1];
        if ($method($className)) { // array('ClassName', 'methodName')
            return true;
        }
    }
    else {
        if ($loader[0]::$loader[1]($className)) {
            return true;
        }
    }
}

Not sure if this will address your issue specifically. If this doesn't work, you could try explicitly requiring the Zend autoloader in your PHP script (presuming that library/Zend is in your include path):

require_once 'Loader/Autoloader.php';

Hope that helps!

Apparently the problem was a recently published an update to the NSS package for CentOS 7 systems which was resulting in an Aache error

/usr/sbin/httpd: symbol lookup error: /lib64/libnsssysinit.so: undefined symbol: PR_GetEnvSecure

The issue was resolved by restarting the Apache and FPM services.

I resolved the problem by restarting my EC2 instance.