二维数组排序 [英] Sorting a Two-Dimensional Array

问题描述

我是PHP新手.我有一个二维的PHP数组. 内部"数组具有我要排序的值.

I am new to PHP. I have a PHP array that is two dimensional. The "inner" array has a value that I want to sort on.

例如:

$myarray[1]['mycount']=12
$myarray[2]['mycount']=13
$myarray[3]['mycount']=9

我想按降序对内部"数组进行排序.

I want to sort the "inner" array in descending order.

所以以下结果将是13、12、9

So the results for the following will be 13, 12, 9

foreach ($myarray as $myarr){
  print $myarr['mycount']
}

提前谢谢.

推荐答案

您可以使用 usort(); 按用户定义的比较进行排序.

You can use usort(); to sort by a user-defined comparison.

// Our own custom comparison function
function fixem($a, $b){
  if ($a["mycount"] == $b["mycount"]) { return 0; }
  return ($a["mycount"] < $b["mycount"]) ? -1 : 1;
}

// Our Data
$myarray[0]['mycount']=12
$myarray[1]['mycount']=13
$myarray[2]['mycount']=9

// Our Call to Sort the Data
usort($myArray, "fixem");

// Show new order
print "<pre>";
print_r($myArray);
print "</pre>";

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