Sort entries using a "natural order" algorithm

# ArrayObject::natsort

(PHP 5 >= 5.2.0, PHP 7, PHP 8)

ArrayObject::natsort — Sort entries using a "natural order" algorithm

### 说明

public function ArrayObject::natsort(): true

This method implements a sort algorithm that orders alphanumeric strings in the way a human being would while maintaining key/value associations. This is described as a "natural ordering". An example of the difference between this algorithm and the regular computer string sorting algorithms (used in ArrayObject::asort) method can be seen in the example below.

> 注意: 如果两个成员完全相同，那么它们将保持原来的顺序。 在 PHP 8.0.0 之前，它们在排序数组中的相对顺序是未定义的。

### 参数

此函数没有参数。

### 返回值

没有返回值。

### 更新日志

版本 | 说明
--- | ---
8.2.0 | 现在返回类型为 `true`；之前是 bool。

### 示例

示例 #1 ArrayObject::natsort() example

    <?php
    $array = array("img12.png", "img10.png", "img2.png", "img1.png");

    $arr1 = new ArrayObject($array);
    $arr2 = clone $arr1;

    $arr1->asort();
    echo "Standard sorting\n";
    var_dump($arr1);

    $arr2->natsort();
    echo "\nNatural order sorting\n";
    var_dump($arr2);
    ?>

以上示例会输出：

    Standard sorting
    object(ArrayObject)#1 (1) {
      ["storage":"ArrayObject":private]=>
      array(4) {
        [3]=>
        string(8) "img1.png"
        [1]=>
        string(9) "img10.png"
        [0]=>
        string(9) "img12.png"
        [2]=>
        string(8) "img2.png"
      }
    }

    Natural order sorting
    object(ArrayObject)#2 (1) {
      ["storage":"ArrayObject":private]=>
      array(4) {
        [3]=>
        string(8) "img1.png"
        [2]=>
        string(8) "img2.png"
        [1]=>
        string(9) "img10.png"
        [0]=>
        string(9) "img12.png"
      }
    }

For more information see: Martin Pool's » Natural Order String Comparison page.

### 参见

- ArrayObject::asort() - Sort the entries by value
- ArrayObject::ksort() - Sort the entries by key
- ArrayObject::natcasesort() - Sort an array using a case insensitive "natural order" algorithm
- ArrayObject::uasort() - Sort the entries with a user-defined comparison function and maintain key association
- ArrayObject::uksort() - Sort the entries by keys using a user-defined comparison function
- natsort() - 用“自然排序”算法对数组排序

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