How to count all data item array in laravel, please help me!. Thank you so much!

Output: 8

CodePudding user response：

reduce()

The reduce method reduces the collection to a single value, passing the result of each iteration into the subsequent iteration:

$count = collect([
    (object)["views_back" => 3],
    (object)["views_back" => 5]
])->reduce(function ($carry, $item) {
    return $carry   $item->views_back;
});

var_export($count); // 8

Addendum

Alternatively, using native/vanilla PHP:

$count = array_sum(array_column([
    (object)["views_back" => 3],
    (object)["views_back" => 5]
], "views_back"));

var_export($count); // 8

CodePudding user response：

When working with arrays in Laravel, it can be helpful to convert them to a Collection which provides some helper methods for arrays.

If all you want is the number of elements in the array use count.

If you want the sum of the views_back elements, use reduce.

$array = [
    [
        'views_back' => 3,
    ],
    [
        'views_back' => 5,
    ]
];

$count = collect($array)->count();

$sum = collect($array)->reduce(function ($carry, $element) {
    return $carry   $element['views_back'];
});

dd($count, $sum);

In the above $count is 2 and $sum is 8.

If your original data is json (as you've used a json tag), you will need to convet the data to an array first:

$array = json_decode($json, true);

CodePudding user response：

You can use laravel collection method sum() method to write smaller code and make it easier to read.

$data = [
    (object)["views_back" => 3],
    (object)["views_back" => 5]
];

collect($data)->sum('views_back');

Converting array to collection can be CPU costly depending on the size of the input array. In that case @steven7mwesigwa vanilla PHP answer would be the best solution.