Question

我有一个需要排序的数组，我将发布一个示例以便更好地理解。这是我未分类的数组：

[0] => Array
    (
        [title] => This is some title
        [catid] => 1
    )    
[1] => Array
    (
        [title] => This is some title
        [catid] => 1
    )
[2] => Array
    (
        [title] => This is some title
        [catid] => 2
    )    
[3] => Array
    (
        [title] => This is some title
        [catid] => 2
    )

我需要像这样重新排序：

[0] => Array
    (
        [title] => This is some title
        [catid] => 1
    )    
[1] => Array
    (
        [title] => This is some title
        [catid] => 2
    )
[2] => Array
    (
        [title] => This is some title
        [catid] => 1
    )    
[3] => Array
    (
        [title] => This is some title
        [catid] => 2
    )

我将有更多这两个类别，我需要为每个类别选择一个项目，所以如果我有3个类别，那么我的catid就会像这样排序：

catid： 1,2,3,1,2,3

由于

Answer 1

这是我的看法：

/** just generating some data, not part of script **/
$originalArray = array();
$title = range('a','z');
for ($x=0;$x<20;$x++) {
  shuffle($title);
  $originalArray[] = array(
    'title' => implode(array_slice($title,0,rand(4,9))),
    'catid' => rand(1,3)
  );
}
/** end generating data **/


$tempArray = array();
foreach ($originalArray as $array) {
  $tempArray[$array['catid']][] = $array['title'];
}
ksort($tempArray);

$newArray = array();
while (count($tempArray)>0) {
  foreach ($tempArray as $mKey => &$mArray) {
    if (count($mArray)>0)
      $newArray[] = array('title'=>array_shift($mArray),'catid'=>$mKey);
  }
  $tempArray = array_filter($tempArray);
}

Answer 2

这就是我提出的一维数组，但它也适用于2d。

$array = [1, 2, 2, 1, 3, 2, 3, 2, 1];

sort($array);

$newarray;


do{
    $max= max($array);
    for($a = 0; $a <= $max; $a++){
        foreach($array as $key => $value){
            if($value == $a){
                $newarray[] = $value;
                unset($array[$key]);
                break;
            }
        }
    }

}while(!empty($array));

此

1, 2, 2, 1, 3, 2, 3, 2, 1

会变成：

1, 2, 3, 1, 2, 3, 1, 2, 2

PHP - 数组的非标准排序

2 个答案: