Getting null array PHP - php

Question

i have a database named "products" which has a column "categories". This table contain four category of products namely electronic,Decoration,clothes and vehicle. My target to show these category with their count ie:if there are four products belongs to category electronic, then output should be like this :electronic=4 and so on
My code
public function category()
{
$arrayCategorys = ['electronic','Decoration','clothes','vehicle'];
$data = [];
foreach($arrayCategorys as $arrayCategory)
{
$sql = "SELECT count(id) FROM products WHERE categories='$arrayCategory'";
$records = \DB::select($sql);
$data = array_merge_recursive($data, [
"{$arrayCategory}" =>isset($records[0]->count),
]);
$data=array_filter($data);
dd($data);
}
}
I want show output like this
'electronic'=>'4',
'Decoration'=>'2',
'clothes'=>'2',
'vehicle'=>'1' according to data in database
but iam getting nothing ,[]

Answer 1

You can GROUP BY your categories like this way when you COUNT
SELECT categories,COUNT(*)
FROM products
GROUP BY categories;
For Idea: http://www.w3resource.com/mysql/aggregate-functions-and-grouping/aggregate-functions-and-grouping-count-with-group-by.php
EDIT: Though i am not familiar with laravel5 syntax but this may work for you
$result = DB::table('products')
->select('products.categories',
DB::raw('count(products.id) as category_count')
)
->orderBy('products.id', 'asc')
->groupBy('products.categories')
->get();

Answer 2

You used isset($records[0]->count) but the column name for the count will be count(id). Name the count as count like this "SELECT count(id) AS count FROM products WHERE categories='$arrayCategory'". And you wont be able to get the count just by checking if it is set. Remove the isset and just use $records[0]->count. The code should look like:
public function category()
{
$arrayCategorys = ['electronic','Decoration','clothes','vehicle'];
$data = [];
foreach($arrayCategorys as $arrayCategory)
{
$sql = "SELECT count(id) AS count FROM products WHERE categories='$arrayCategory'";
$records = \DB::select($sql);
$data = array_merge_recursive($data, [
"{$arrayCategory}" =>$records[0]->count,
]);
$data=array_filter($data);
dd($data);
}
}