Laravel get Duplicate Values from the Collection

Published on Jun 29, 2022

Hello Artisans, today we'll discuss how to we can get the duplicates values from the collection. The Illuminate\Support\Collection class provides a fluent, convenient wrapper for working with arrays of data. For example, check out the following code. We'll use the collect helper to create a new collection instance from the array. So, no more talk, let's see how we can achieve our goal in our Laravel Application.

Table of Contents

  1. Syntax
  2. Laravel Collection duplicates() Examples

Syntax

The syntax of using a collection method is the collection itself followed by the method. The syntax is:

// passing a collection instance followed by the method itself

$collection->duplicates();

Laravel Collection duplicates() Example

The duplicates method retrieves and returns duplicate values from the collection:

$collection = collect(['a', 'b', 'a', 'c', 'b']);
 
$collection->duplicates();
 
// [2 => 'a', 4 => 'b']

If the collection contains arrays or objects, you can pass the key of the attributes that you wish to check for duplicate values:

$employees = collect([
    ['email' => '[email protected]', 'position' => 'Developer'],
    ['email' => '[email protected]', 'position' => 'Designer'],
    ['email' => '[email protected]', 'position' => 'Developer'],
]);
 
$employees->duplicates('position');
 
// [2 => 'Developer']

That's all for today. Hope you've enjoyed this tutorial. Thanks for reading.🙂

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