按多个字段对多维数组进行排序

本文介绍了按多个字段对多维数组进行排序的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 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