Try “bootstrapping” WordPress for your custom script first: include '../../../wp-load.php' (you might need to adjust the path for your needs).
Then you can safely use the $wpdb class, such as $wpdb->get_results and other goodies. Don’t forget to escape/clean your incoming data, if any.
WordPress documentation on $wpdb
PS: always try to use “builtin” functions. The codex above is gold.
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