How to Remove Duplicate Subarrays from a PHP Multidimensional Array Based on Email?

PHP Multidimensional Array: Removing Duplicates Based on Email

Problem:

You have a multidimensional array with subarrays containing name, surname, and email information, as shown below:

$array = [
    [0] => ['dave', 'jones', 'dave.jones@example.com'],
    [1] => ['john', 'jones', 'john.jones@example.com'],
    [2] => ['bruce', 'finkle', 'bruce.finkle@example.com'],
];

You need to remove duplicate subarrays based on the email value.

Solution:

To effectively deduplicate a multidimensional array based on a specific value, we can utilize array indexes' uniqueness. Here's a solution using this approach:

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

Notice:

• The last match for each email address is retained in the resulting array. To prioritize the first match, reverse the array before iterating through it:

foreach (array_reverse($array) as $val) {

• The array indexes in the new array may not be consecutive.

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