Question

我有一个数组在每个索引上都有这样的值我有一个嵌套数组[cats]和[products]

   Array
(
    [0] => Array
        (
            [cat] => 6,
            [products] => 3
        ),

    [1] => Array
        (
            [cat] => 6,
            [products] => 4
        ),
   [2] => Array
        (
            [cat] => 7,
            [products] => 9
        )
)

我希望将此数组更改为具有相同值的所有[cats]索引合并为单个索引，并将这些索引的[products]索引合并为嵌套数组

  Array
(
    [0] => Array
        (
            [cat] => 6
            [products] => array(
                                [0]=>3,
                                [1]=>4 )
        ),

    [1] => Array
        (
            [cat] => 7,
            [products] => 9
        )
  )

我试过但是我的代码不能正常工作我的代码是这样的

$products = array(
    array(
        'cat' => 6,
        'products' => 3
    ),
    array(
        'cat' => 6,
        'products' => 4
    ),
    array(
        'cat' => 7,
        'products' => 9
    )
);
$newProducts = array();
foreach ($products as $item) {
    if (!empty($newProducts[$item['cat']])) {
        $currentValue = $newProducts[$item['cat']]['products'];
        $newProducts[$item['cat']]['products'] = $item['products'];
    } else {
        $newProducts[$item['cat']] = $item;
    }
}

Answer 1

正如其他人所说，你应该从foreach

开始

<?php

$products = array(
    array(
        'cat' => 6,
        'products' => 3
    ),
    array(
        'cat' => 6,
        'products' => 4
    ),
    array(
        'cat' => 7,
        'products' => 9
    )
);
$newProducts = array();
foreach ($products as $item) {
    if (!empty($newProducts[$item['cat']])) {
        $currentValue = (array) $newProducts[$item['cat']]['products'];
        $newProducts[$item['cat']]['products'] = array_merge($currentValue, (array) $item['products']);
    } else {
        $newProducts[$item['cat']] = $item;
    }
}
var_dump(array_values($newProducts));

输出如下：

array(2) {
  [0]=>
  array(2) {
    ["cat"]=>
    int(6)
    ["products"]=>
    array(2) {
      [0]=>
      int(3)
      [1]=>
      int(4)
    }
  }
  [1]=>
  array(2) {
    ["cat"]=>
    int(7)
    ["products"]=>
    int(9)
  }
}

Answer 2

试试这个：

<?php

$array = array(
    array(
        'cat'=>6,
        'product'=>3,
    ),
    array(
        'cat'=>6,
        'product'=>4,
    ),
    array(
        'cat'=>5,
        'product'=>9,
    ),
);
$catIndex = array();

foreach($array as $subarray)
{
    if(!isset($catIndex[$subarray['cat']]))
        $catIndex[$subarray['cat']] = array('cat'=>$subarray['cat'], 'products'=>array());

    $catIndex[$subarray['cat']]['products'][] = $subarray['product'];

}

var_dump(array_values($catIndex));

工作示例：CLICK!

Answer 3

此脚本可能会有所帮助。

忽略$ arr1，$ arr2，$ arr3。我只是创建它们来制作像你一样的数组。

<div id="add_item_modal" class="modal" data-backdrop="" role="dialog">

输出 -

$arr1 = array(
    'cat' => 6,
    'products' => 3,
);
$arr2 = array(
    'cat' => 6,
    'products' => 4,
);
$arr3 = array(
    'cat' => 7,
    'products' => 9,
);
$arr4 = array($arr1, $arr2, $arr3);

print_r($arr4);

$n = count($arr4);

for($i=0; $i<$n; $i++){
    if($arr4[$i]['cat'] == $arr4[$i+1]['cat']){
        $arr5[$i]['cat'] = $arr4[$i]['cat'];
        $arr5[$i]['products'] = array($arr4[$i]['products'],$arr4[$i+1]['products']);
    }
    else {
        $arr5[] = $arr4[$i+1];
    }
}
array_pop($arr5); // just to delete the last null index of the array,
                   //created by the loop.
print_r($arr5)

如何在php中合并具有相同值的数组索引

3 个答案: