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Laravel Collection Key Method

writter  Sumit Dey Sarkar
Date  22 Mar 2023
Language  Laravel
Laravel Collection Key Method

Laravel Collection Key Method

In this tutorial we will see laravel collection key method.


Laravel collection key method

The `key` method in Laravel collection returns the key of the first item in the collection that passes a given truth test. If no item passes the test, the method returns null.

The syntax of the `key` method is:



Here, `$collection` is the instance of the Laravel collection, and `$callback` is an optional closure or string used to test each item in the collection. If `$callback` is not provided, the `key` method returns the key of the first item in the collection.

Example Usage:

Let's say we have a collection of students, and we want to find the key of the first student whose name starts with the letter 'J'. We can use the `key` method as follows:

$students = collect([
    ['name' => 'John', 'age' => 21],
    ['name' => 'Jane', 'age' => 22],
    ['name' => 'Jim', 'age' => 23],
    ['name' => 'Jake', 'age' => 24],

$key = $students->key(function ($student, $key) {
    return substr($student['name'], 0, 1) === 'J';

echo $key; // Output: 0


In the above example, the `key` method returns the key 0, which is the index of the first student in the collection whose name starts with the letter 'J' (i.e., 'John').

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