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PHP中sort、asort与ksort区别用法详解

WBOY
WBOYOriginal
2016-06-20 13:02:372345browse

PHP中sort、asort与ksort对数组的排序方法异同点:

sort只依据值从小到大排序,键值不参与排序

asort依据值排序,键值参与排序

ksort依据键值排序,值参与排序

 

sort只依据值从小到大排序,键值不参与排序。例

 <?php

   $arr=array("a"=>"d","d"=>"c","b"=>"a");

   sort($arr);

   var_dump($arr);

 ?>

结果

array(3) { [0]=> string(1) "a" [1]=> string(1) "c" [2]=> string(1) "d" }

asort依据值进行排序,键值参与排序

 <?php

   $arr=array("a"=>"d","d"=>"c","b"=>"a");

   asort($arr);

   var_dump($arr);

 ?>

结果

array(3) { ["b"]=> string(1) "a" ["d"]=> string(1) "c" ["a"]=> string(1) "d" }

ksort依据键值进行排序,值参与排序

 <?php

   $arr=array("a"=>"d","d"=>"c","b"=>"a");

   ksort($arr);

   var_dump($arr);

 ?>

结果

array(3) { ["a"]=> string(1) "d" ["b"]=> string(1) "a" ["d"]=> string(1) "c" }


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