PHP - 按子数组值对数组进行分组（索引数组）-解网

问：

我需要按子数组值对数组进行分组。

刚刚通过这个链接。

按子数组值对数组进行分组

但是这里的子数组值有键。就我而言，我们没有钥匙。仅索引键。下面是我的数组

Array
(
    [0] => Array
        (
            [0] => 14. Remarketing Bengaluru
            [1] => RM Web
            [2] => Ludhiana
            **[3] => Display Only**
            [4] => INR
            [5] => 6
        )

    [1] => Array
        (
            [0] => 12. Other Search ROTN
            [1] => 01. Eye glass Shapes
            [2] => Tiruchirappalli
            **[3] => Search Only**
            [4] => INR
            [5] => 144
        )

    [2] => Array
        (
            [0] => 10. Brand ROTN
            [1] => 03. Brand + Keywords
            [2] => Erode
            **[3] => Search Only**
            [4] => INR
            [5] => 24
        )

    [3] => Array
        (
            [0] => 11. Competitors ROTN
            [1] => 02. Titan Eye Plus
            [2] => Thoothukudi
            **[3] => Search Only**
            [4] => INR
            [5] => 1
        )

    [4] => Array
        (
            [0] => 14. Remarketing Bengaluru
            [1] => RM Web
            [2] => Chandigarh
            **[3] => Display Only**
            [4] => INR
            [5] => 6
        )
)

预期：

需要对带有星标值的数组进行分组。例如。需要使用数组索引键 3 对数组进行分组。

分组数组应类似于“仅显示”、“仅搜索”

PHP 排序多维数组

$old_arr = array( 
  array( "14. Remarketing", "RM", "Lu", "Display Only", "INR", "6" ), 
  array( "12. Other", "Shapes", "Ti", "Search Only", "INR", "144" ), 
  array( "10. Brand", "Brand", "E", "Search Only", "INR", "24" ), 
  array( "11. Competitors", "Titan", "Th", "Search Only", "INR", "1"), 
);

foreach ($old_arr as $key => $item) {
   $arr[$item[3]][$key] = $item;
}

echo '<pre>';
var_export($arr);

结果：

array (
  'Display Only' => 
  array (
    0 => 
    array (
      0 => '14. Remarketing',
      1 => 'RM',
      2 => 'Lu',
      3 => 'Display Only',
      4 => 'INR',
      5 => '6',
    ),
  ),
  'Search Only' => 
  array (
    1 => 
    array (
      0 => '12. Other',
      1 => 'Shapes',
      2 => 'Ti',
      3 => 'Search Only',
      4 => 'INR',
      5 => '144',
    ),
    2 => 
    array (
      0 => '10. Brand',
      1 => 'Brand',
      2 => 'E',
      3 => 'Search Only',
      4 => 'INR',
      5 => '24',
    ),
    3 => 
    array (
      0 => '11. Competitors',
      1 => 'Titan',
      2 => 'Th',
      3 => 'Search Only',
      4 => 'INR',
      5 => '1',
    ),
  ),
)

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PHP - 按子数组值对数组进行分组（索引数组）

PHP - Group Array by its Sub Array Value (Indexed Array)

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