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Parsing elements in a multidimensional php array

I am creating an e-commerce site where I have to specify the categories that the store has in a specific array. Currently the data retrieved from mysql table contains the same category ID in different array elements, if the array has a different subcategory, I need to collect the same category ID in the same array, and create a nested array for the subcategories. The code is on laravel 4.2. Here is the format of the data coming in right now,

"data": [
    {
      "id": 1,
      "name": "Fruits",
      "sub_category_names": [
        "Dairy Whiteners"
      ],
      "total_items": 69
    },
    {
      "id": 1,
      "name": "Fruits",
      "sub_category_names": [
        "Tea & Coffee"
      ],
      "total_items": 69
    },
    {
      "id": 1,
      "name": "Fruits",
      "sub_category_names": [
        "Concentrates - Tang etc"
      ],
      "total_items": 69
    },
    {
      "id": 2,
      "name": "Beverages",
      "sub_category_names": [
        "Tea & Coffee"
      ],
      "total_items": 28
    },
    {
      "id": 2,
      "name": "Beverages",
      "sub_category_names": [
        "Concentrates - Tang etc"
      ],
      "total_items": 28
    }
  ]

This is what I need,

"data": [
    {
      "id": 1,
      "name": "Fruits",
      "sub_category_names": [
        "Dairy Whiteners" , "Concentrates - Tang etc" , "Tea & Coffee"
      ],
      "total_items": 69
    } ,

    {
      "id": 2,
      "name": "Beverages",
      "sub_category_names": [
        "Tea & Coffee" , "Concentrates - Tang etc"
      ],
      "total_items": 28
    }
  ]

The code I wrote for above is

// For the current categories create a common array for subcategories for same categories
        $filteringSelectedCategories = [];
        $subCategoriesNamesLocal = [];
        $innerIndex = 0;
        for ($i = 0; $i < count($selectedCategories); $i++) {

            // to prevent undefined offset error
            if (!isset($selectedCategories[$i + 1])) {
                continue ;
                // if 6 don't exist then deal with 5
            }
            // if the id of two items is same then push that sub category name in the same array
            if ($selectedCategories[$i]['id'] === $selectedCategories[$i + 1]['id']) {
                array_push($subCategoriesNamesLocal, $selectedCategories[$i]['sub_category_names']);
            } 
            // if the id is different then push the array values with the sub category name in an array 
            else {

                $filteringSelectedCategories[$innerIndex]['id'] = $selectedCategories[$i]['id'];
                $filteringSelectedCategories[$innerIndex]['name'] = $selectedCategories[$i]['name'];
                $filteringSelectedCategories[$innerIndex]['sub_category_names'] = $subCategoriesNamesLocal;
                $filteringSelectedCategories[$innerIndex]['total_items'] = $selectedCategories[$i]['total_items'];

                // nullify the array after assigning the value
                $subCategoriesNamesLocal = [];
                // increment the new array index
                $innerIndex = $innerIndex + 1;

            }
        }

Here is the result I get from the above,

"data": [
    {
      "id": 1,
      "name": "Fruits",
      "sub_category_names": [
        [
          "Dairy Whiteners"
        ],
        [
          "Tea & Coffee"
        ]
      ],
      "total_items": 69
    }
  ]
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3 answers


I'm not really sure I can see an offset error can occur, but I believe you can easily escape.



foreach ($selectedCategories as $key => $data) {
    $newKey = $data['id'];
    $filteringSelectedCategories[$newKey]['id'] = $data['id'];
    $filteringSelectedCategories[$newKey]['name'] = $data['name'];
    $filteringSelectedCategories[$newKey]['sub_category_names'][] = $data['sub_category_names'];
    $filteringSelectedCategories[$newKey]['total_items'] = $data['total_items'];
}
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You cannot make an array by pushing directly into $ subCategoriesNamesLocal, because you are nested arrays. Make an array outside and then connect it to the field.



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Try the following:

// For the current categories create a common array for subcategories for same categories
        $filteringSelectedCategories = [];
        $subCategoriesNamesLocal = [];
        $innerIndex = 0;
        for ($i = 0; $i < count($selectedCategories); $i++) {

            // to prevent undefined offset error
            if (!isset($selectedCategories[$i + 1])) {
                continue ;
                // if 6 don't exist then deal with 5
            }
            // if the id of two items is same then push that sub category name in the same array
            if ($selectedCategories[$i]['id'] === $selectedCategories[$i + 1]['id']) {
                array_push($subCategoriesNamesLocal, $selectedCategories[$i]['sub_category_names']);
            } 
            // if the id is different then push the array values with the sub category name in an array 
            else {

                $filteringSelectedCategories[$innerIndex]['id'] = $selectedCategories[$i]['id'];
                $filteringSelectedCategories[$innerIndex]['name'] = $selectedCategories[$i]['name'];
                $filteringSelectedCategories[$innerIndex]['sub_category_names'] = '"' . implode('","', $subCategoriesNamesLocal) . '"';

}
                $filteringSelectedCategories[$innerIndex]['total_items'] = $selectedCategories[$i]['total_items'];

                // nullify the array after assigning the value
                $subCategoriesNamesLocal = [];
                // increment the new array index
                $innerIndex = $innerIndex + 1;

            }
        }
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