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Source code

function maybe_create_table($table_name, $create_ddl) {

	global $wpdb;

	foreach ($wpdb->get_col("SHOW TABLES",0) as $table ) {

		if ($table == $table_name) {

			return true;

		}

	}

	//didn't find it try to create it.

	$wpdb->query($create_ddl);

	// we cannot directly tell that whether this succeeded!

	foreach ($wpdb->get_col("SHOW TABLES",0) as $table ) {

		if ($table == $table_name) {

			return true;

		}

	}

	return false;

}