How Can I Deduplicate a Multi-Dimensional PHP Array Based on a Specific Value?

Deduplicating Multi-Dimensional Arrays Based on Specific Values in PHP

This article addresses the issue of removing duplicate entries from a two-dimensional array based solely on a specific value within each nested array.

Problem Description

The provided array contains sub-arrays with three values: a name, a last name, and an email address. The goal is to remove sub-arrays with duplicate email addresses while preserving the order of the remaining arrays.

Solution

The below approach leverages a common property of PHP arrays: their unique indexes.

$newArr = array();
foreach ($array as $val) {
    $newArr[$val[2]] = $val;    
}
$array = array_values($newArr);

This solution involves creating a new array with email addresses as keys. The value for each key is set to the corresponding sub-array. This uniquely associates each email address with its corresponding sub-array, effectively removing duplicates. The final result is an array with the desired deduplicated sub-arrays, but the indexes may be altered.

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