What are the PHP sorting functions?

//php sorting function example
function array_sort($arr,$keys,$type='asc')
{
 echo 'Start sorting...'.' $keysvalue = $new_array = array();
 foreach ($arr as $k=>$v)
 {
 $keysvalue[$k] = $v[$keys];
 }
 if( $type == 'asc')
 {
 asort($keysvalue);
 }
 else
 {
 arsort($keysvalue);
 }
 reset($keysvalue);
 foreach ($keysvalue as $k=> $v)
 {
 $new_array[$k] = $arr[$k];
 }
 echo 'End of sorting...'.'';
 return $new_array;
}