Question

With a PHP web application, I’m encountering a fatal error with PDO::MYSQL_ATTR_MAX_BUFFER_SIZE, but only on very rare hosting plans. It’s saying this constant is not available. How do I detect that it’s not available and not use it?

I mean, I can use the if (!defined(…)) if/then check, but will this still get the fatal error on those systems where MYSQL_ATTR_MAX_BUFFER_SIZE is not compiled with PDO? Note that there’s a known bug regarding MYSQL_ATTR_MAX_BUFFER_SIZE and mysqlnd, where it’s not compiled in cases where mysqlnd is installed. The bug is marked as “won’t fix”.

Answer 1

You are not using defined() properly, is my guess. You need to provide it a string.

if( defined( 'PDO::MYSQL_ATTR_MAX_BUFFER_SIZE' ) ) // note the quotes
{
    // do something useful with PDO::MYSQL_ATTR_MAX_BUFFER_SIZE
}

The above example doesn’t issue any notice/warning/error in my setup (PHP 5.3.20, in which PDO::MYSQL_ATTR_MAX_BUFFER_SIZE is not defined), using error_reporting( E_ALL | E_STRICT ).