Gary Pendergast writes on Make WordPress Core:
In WordPress 3.9, we added an extra layer to WPDB, causing it to switch to using the mysqli PHP library, when using PHP 5.5 or higher.
For plugin developers, this means that you absolutely shouldn’t be using PHP’s mysql_*() functions any more – you can use the equivalent WPDB functions instead.
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My name is Jan. I am not a hacker, coder, developer, programmer or guru. I am merely a system administrator, doing my daily thing at Vevida in the Netherlands. With over 15 years of experience, my specialties include Windows Server, IIS, Linux (CentOS, Debian), security, PHP, websites & optimization.
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