Parse the items in an multidimentional array php - php

Question

I am creating an e-commerce website where I have to give the categories that a shop has in a particular array . Currently the data getting retrieved from a mysql table contains the same category id's in different array items if the array has different subcategory , I have to gather the same category id's in the same array and for subcategories create a nested array . The code is on laravel 4.2 . Here is the format of data coming 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
}
]
Here 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 the above ,
// 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 output I get from the above ,
"data": [
{
"id": 1,
"name": "Fruits",
"sub_category_names": [
[
"Dairy Whiteners"
],
[
"Tea & Coffee"
]
],
"total_items": 69
}
]

Answer 1

I'm not entirely sure I see what offset error could occur but I believe you could easily get away with;
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'];
}

Answer 2

You can not make an array push directly in $subCategoriesNamesLocal because you are nesting arrays. Make an array outside and then concatenate it to the field.

Answer 3

Try this:
// 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;
}
}