When duplicate keys are in an array, it will be overwritten with the specified value later.
<?php
$array = ["a" => 1, "a" => 2]; // DuplicateKey: Duplicate key found in array.<?php
$array = ["a" => 1, "b" => 2]; // OK!When duplicate keys are in an array, it will be overwritten with the specified value later.
<?php
$array = ["a" => 1, "a" => 2]; // DuplicateKey: Duplicate key found in array.<?php
$array = ["a" => 1, "b" => 2]; // OK!