php多维数组转一维数组

 function arrToOne($multi) 
{
	 $arr = array();
	 foreach ($multi as $key => $val) {
	  if( is_array($val) ) {
	   $arr = array_merge($arr, arrToOne($val));
	  } else {
	   $arr[] = $val;
	  }
	 }
	 return $arr;
}