按多个字段对多维数组进行排序 [英] Sorting multi-dimentional array by more than one field

问题描述

我有以下数据：

  Array（
 [0] => Array（
 [文件名] => def 
 [文件大小] => 4096 
 [文件时间] => 1264683091 
 [is_dir] => 1 
 [is_file] => ; 
）
 [1] =>阵列（
 [filename] => abc 
 [filesize] = >> 4096 
 [filemtime] => 1264683091 
 [is_dir] => 1 
 [is_file] => 
）
 [2] =>数组（
 [filename] => Rabbit 
 [文件大小] => 4096 
 [filemtime] => 1264683060 
 [is_dir] => 0 
 [is_file] = >> 
）
 [3] =>数组（
 [filename] =>猫头鹰
 [filesize] => 4096 
 [filemtime] => 1264683022 
 [is_dir] => 0 
 [is_file] => 
）
）
  

，我想按更多排序多于一个值。 （例如，按is_dir和按文件名（按字母顺序排列）或按filemtime和按文件名等。）

到目前为止，我已经尝试了许多解决方案，但没有一个起作用。 / p>

有人知道最好的PHP算法/函数/方法来排序吗？

解决方案

使用 usort 并传递您自己的比较函数

  //示例比较函数
 //这将导致一个列表，该列表首先按is_dir排序，然后按is_dir排序通过文件名
函数cmp（$ a，$ b）{
 //首先检查is_dir是否相同，这意味着我们可以
 //通过定义的另一个因子进行排序（在这种情况下，文件名）
 if（$ a ['is_dir'] == $ b ['is_dir']）{
 //按文件名比较
 return strcmp（$ a [' filename']，$ b ['filename']）; 
} 
 //否则用is_dir比较，因为它们不相同，并且
 // is_dir优先于文件名
 return（$ a ['is_dir']< $ b ['is_dir']）吗？ -1：1; 
} 
  

然后您将像这样使用usort：

  usort（$ myArray， cmp）; 
 // $ myArray现在已排序
  

I have the following data:

Array ( 
  [0] => Array ( 
         [filename] => def
         [filesize] => 4096 
         [filemtime] => 1264683091 
         [is_dir] => 1 
         [is_file] => 
  ) 
  [1] => Array ( 
         [filename] => abc
         [filesize] => 4096 
         [filemtime] => 1264683091 
         [is_dir] => 1 
         [is_file] => 
  ) 
  [2] => Array ( 
         [filename] => rabbit
         [filesize] => 4096 
         [filemtime] => 1264683060 
         [is_dir] => 0
         [is_file] => 
  )
  [3] => Array ( 
         [filename] => owl
         [filesize] => 4096 
         [filemtime] => 1264683022
         [is_dir] => 0
         [is_file] => 
  )
)

and I would like to sort it by more than one value. (e.g. by is_dir AND by filename (alphabetically) or by filemtime AND by filename, etc.)

So far I've tried many solutions, none have which worked.

Does anyone know the best PHP algorhythm/function/method to sort this like so?

解决方案

Use usort and pass your own comparison function to the function.

//example comparison function
//this results in a list sorted first by is_dir and then by file name
function cmp($a, $b){
    //first check to see if is_dir is the same, which means we can
    //sort by another factor we defined (in this case, filename)
    if ( $a['is_dir'] == $b['is_dir'] ){
        //compares by filename
        return strcmp($a['filename'], $b['filename']);
    }
    //otherwise compare by is_dir, because they are not the same and
    //is_dir takes priority over filename
    return ($a['is_dir'] < $b['is_dir']) ? -1 : 1;   
}

You would then use usort like so:

usort($myArray, "cmp");
//$myArray is now sorted

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