通过包含数字和字母的两个值对多维数组进行排序

问题描述：

I have an array which looks like

[0] => Array
    (
        [typeName] => Element
        [quantity] => 35
        [flag] => 4
    )

I already found a way by using usort() to sort an array by its sub elements. Which works great for numeric values.

public static function _sortByAmount($a, $b) {
        return $b['quantity'] - $a['quantity'];
}

From time to time, it could happen that I have more than one array elements with the same quantity. Those entries should be sorted by the Name too. In the end, the array should look like this.

[0] => Array
    (
        [typeName] => Element
        [quantity] => 567
        [flag] => 4
    )
[1] => Array
    (
        [typeName] => aaa-element
        [quantity] => 35
        [flag] => 4
    )
[2] => Array
    (
        [typeName] => bbb-element
        [quantity] => 35
        [flag] => 4
     )
[3] => Array
    (
        [typeName] => Element
        [quantity] => 10
        [flag] => 4
    )

Is it possible to extend my function somehow?

我有一个类似于 p>

  [0]的数组 =＆GT; 数组
（
 [typeName] =＆gt;元素
 [数量] =＆gt; 35 
 [flag] =＆gt; 4 
）
  code>  pre> 
 
 我已经找到了一种方法，使用 usort（） code>按子元素对数组进行排序。 这适用于数值。 p> 
 
 
  public static function _sortByAmount（$ a，$ b）{
 return $ b ['quantity']  -  $ a ['quantity'  ]; 
} 
  code>  pre> 
 
 有时我可能会遇到多个数量相同的数组元素。 这些条目也应按名称排序。 最后，数组应如下所示。 p> 
 
 
  [0] =＆gt; 数组
（
 [typeName] =＆gt;元素
 [数量] =＆gt; 567 
 [flag] =＆gt; 4 
）
 [1] =＆gt; 数组
（
 [typeName] =＆gt; aaa-element 
 [数量] =＆gt; 35 
 [flag] =＆gt; 4 
）
 [2] =＆gt; 数组
（
 [typeName] =＆gt; bbb-element 
 [数量] =＆gt; 35 
 [flag] =＆gt; 4 
）
 [3] =＆gt; 数组
（
 [typeName] =＆gt;元素
 [数量] =＆gt; 10 
 [flag] =＆gt; 4 
）
  code>  pre> 
 
 是否有可能以某种方式扩展我的功能？ p> 
  div>

答

You can check anything you want in your compare function. For example, if quantity == quantity then return strcmp.

public static function _sortByAmount($a, $b) {
    if($b['quantity'] == $a['quantity']){
        return strcmp($a['typeName'], $b['typeName']);
    } else {
        return $b['quantity'] - $a['quantity'];
    }
}

you can also use strcasecmp if you want the check to be case insensitive.

答

not sure, but

public static function _sortByAmount($a, $b) {
        $byQuantity = $a['quantity'] - $b['quantity'];
        return $byQuantity ?: strcmp($a['typeName'], $b['typeName']);
}

通过包含数字和字母的两个值对多维数组进行排序

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