php的排序函数

sort(): 将一个数组元素从低到高进行简单排序，这个函数既可以按数字大小排列也可以按字母顺序排列。

Listing A

$data = array(5,8,1,7,2);

  sort($data);

  print_r($data);

?>输出结果如下所示：

Array ([0] => 1[1] => 2[2] => 5[3] => 7[4] => 8)

rsort(): 对数组元素进行从高到低的倒排，同样可以按数字大小排列也可以按字母顺序排列。

$data = array(5,8,1,7,2);rsort($data); print_r($data);
?>它的输出结果如下：

Array ([0] => 8[1] => 7[2] => 5[3] => 2[4] => 1)

ksort(): 根据关键字进行排序的函数，同时，它在排序的过程中会保持关键字的相关性。

$data = array("US" => "United States", "IN" => "India", "DE" => "Germany", "ES" => "Spain");
    ksort($data);
    print_r($data);
?>它的输出结果如下：

Array ([DE] => Germany

[ES] => Spain

[IN] => India

[US] => United States

)

krsort(): 根据关键字对数组进行倒排。

$data = array("US" => "United States", "IN" => "India", "DE" => "Germany", "ES" => "Spain");
    krsort($data);
    print_r($data);
?>它的输出结果如下：

Array ([US] => United States

[IN] => India

[ES] => Spain

[DE] => Germany

)

asort(): 使用值排序来取代关键字排序，请注意关键字-值之间的联系会始终保持。

$data = array("US" => "United States", "IN" => "India", "DE" => "Germany", "ES" => "Spain");
    asort($data);
    print_r($data);
?>它的输出结果如下：

Array ([DE] => Germany

[IN] => India

[ES] => Spain

[US] => United States

)

arsort(): 根据值按字母表顺序进行倒排。

$data = array("US" => "United States", "IN" => "India", "DE" => "Germany", "ES" => "Spain");
    arsort($data);
    print_r($data);
?>Array ([US] => United States

[ES] => Spain

[IN] => India

[DE] => Germany

)

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以上就介绍了php的排序函数，包括了方面的内容，希望对PHP教程有兴趣的朋友有所帮助。