php实现数组按指定KEY排序的方法

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function array_sort($arr,$keys,$orderby='asc'){

$keysvalue = $new_array = array();

foreach ($arr as $k=>$v){

$keysvalue[$k] = $v[$keys];

}

if($orderby== 'asc'){

asort($keysvalue);

}else{

arsort($keysvalue);

}

reset($keysvalue);

foreach ($keysvalue as $k=>$v){

$new_array[] = $arr[$k];

}

return $new_array;

}