How to Use filter For a Collection in Laravel

Syntax

public function filter(callable $callback = null)
{
 if ($callback) {
   return new static(Arr::where($this->items, $callback));
 }

  return new static(array_filter($this->items));
}

The filter function takes a callback as an argument and runs a filter over each item. If the test fails for a particular item, it will be removed from the collection.

From now on, we will test each Laravel Collections Method inside the routes >> web.php file.

Example

Write the following code inside the web.php file.

<?php

// web.php

Route::get('/', function () {
  $collection = collect([19, 21, 29, 46]);

  $filtered = $collection->filter(function ($value, $key) {
  return $value > 21;
 });

 dd($filtered->all());
});

We have checked each collection item against 21, and if any item > 21 is in the collection, it will be included in a new array.

Start the Laravel server by typing the following command in your project root.

php artisan serve

Go to http://localhost:8000, and you will see the following output.

If no callback is supplied, all entries of the collection that are equivalent to false will be removed.

<?php

// web.php

Route::get('/', function () {
  $collection = collect([0, 1, 2, 3, 4, 5]);

  $filtered = $collection->filter();

  dd($filtered->all());
});

In the above code, the 0 entry will be removed because it has been taken as a boolean 0, which is false. Thus, the output is the following.

That’s it for this tutorial.