function require_wp_db() {}

Load the correct database class file.
This function is used to load the database class file either at runtime or by wp-admin/setup-config.php We must globalise $wpdb to ensure that it is defined globally by the inline code in wp-db.php.

Source code

function require_wp_db() {

	global $wpdb;

	if ( file_exists( WP_CONTENT_DIR . '/db.php' ) )

		require_once( WP_CONTENT_DIR . '/db.php' );


		require_once( ABSPATH . WPINC . '/wp-db.php' );



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