| add this code before using mysqli extension :
/*########################################################*/
	if(!extension_loaded('mysqli')){
		$prefix = (PHP_SHLIB_SUFFIX == 'so') ? '' : 'php_';
		if(!@dl($prefix . 'mysqli' . PHP_SHLIB_SUFFIX)){
			require_once 'mysqli.so.php';		
		}
	}
	
/*########################################################*/
if mysqli extension not loaded, it'll include mysqli.so.php file.
Good coding! ;)
 |