我怎么然后通过PHP的价值排序字符串长度的数组？ [英] How do I sort an array by string length then by value in PHP?

问题描述

目前，我有我的数组通过字符串长度排序。但是，当字符串长度相等，我怎么排序的价值？

作为一个例子，我现在的code：

  $阵列=阵列（A，BC，AA，C，BB，B）;功能lensort（$ A，$ B）{
    返回的strlen（$ A）-strlen（$ B）;
}usort（$阵列，'lensort'）;的print_r（$数组）;
 

输出：

 阵列
（
    [0] =＆GT; C
    [1] =＆GT;一个
    [2] =＆GT;乙
    [3] =＆GT; BB
    [4] =＆GT; AA
    [5] =＆GT;公元前
）
 

不过，我想它由以下代替排序：

 阵列
（
    [0] =＆GT;一个
    [1] =＆GT;乙
    [2] =＆GT; C
    [3] =＆GT; AA
    [4] =＆GT; BB
    [5] =＆GT;公元前
）
 

解决方案

二者结合检查到你的比较：

 函数lensort（$ A，$ B）{
    $ LA = strlen的（$ A）; $磅= strlen的（$ B）;
    如果（$ LA == $磅）{
        返回STRCMP（$ A，$ B）;
    }
    回拉$  -  $磅;
}
 

您可以从看到这个演示，这将显示：

 阵列
（
    [0] =＆GT;一个
    [1] =＆GT;乙
    [2] =＆GT; C
    [3] =＆GT; AA
    [4] =＆GT; BB
    [5] =＆GT;公元前
）
 

Currently, I have my array sorting by string length. But, when the string lengths are equal, how do I sort by value?

As an example, my current code:

$array = array("A","BC","AA","C","BB", "B");

function lensort($a,$b){
    return strlen($a)-strlen($b);
}

usort($array,'lensort');

print_r($array);

Outputs:

Array
(
    [0] => C
    [1] => A
    [2] => B
    [3] => BB
    [4] => AA
    [5] => BC
)

But, I'd like it to sort by the following instead:

Array
(
    [0] => A
    [1] => B
    [2] => C
    [3] => AA
    [4] => BB
    [5] => BC
)

解决方案

Incorporate both checks into your comparator:

function lensort($a,$b){
    $la = strlen( $a); $lb = strlen( $b);
    if( $la == $lb) {
        return strcmp( $a, $b);
    }
    return $la - $lb;
}

You can see from this demo that this prints:

Array
(
    [0] => A
    [1] => B
    [2] => C
    [3] => AA
    [4] => BB
    [5] => BC
)

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