<?php

/**

* Merges user datasets for quick fixes with basic input validation.

*

* @param array $datasets An array of user datasets. Each dataset is an array of user information.

* @return array A merged array of user datasets, or an error message if validation fails.

*/

function mergeUserDatasets(array $datasets): array|string

{

$mergedData = [];

foreach ($datasets as $dataset) {

// Basic validation: Check if the dataset is an array

if (!is_array($dataset)) {

return "Error: Dataset must be an array.";

}

foreach ($dataset as $user) {

// Basic validation: Check if the user is an associative array

if (!is_array($user)) {

return "Error: User data must be an associative array.";

}

// Validate required fields (e.g., 'id', 'name', 'email')

if (!isset($user['id']) || !isset($user['name']) || !isset($user['email'])) {

return "Error: Missing required fields (id, name, email).";

}

// Sanitize input (basic example)

$user['name'] = htmlspecialchars(trim($user['name']));

$user['email'] = filter_var($user['email'], FILTER_SANITIZE_EMAIL);

$user['id'] = intval($user['id']); //Ensure id is an integer

$mergedData[] = $user;

}

}

return $mergedData;

}

// Example Usage:

/*

$dataset1 = [

['id' => 1, 'name' => 'John Doe', 'email' => 'john.doe@example.com'],

['id' => 2, 'name' => 'Jane Smith', 'email' => 'jane.smith@example.com'],

];

$dataset2 = [

['id' => 3, 'name' => 'Peter Jones', 'email' => 'peter.jones@example.com'],

];

$mergedDatasets = mergeUserDatasets([$dataset1, $dataset2]);

if (is_string($mergedDatasets)) {

echo $mergedDatasets . "\n"; // Output error message

} else {

print_r($mergedDatasets); // Output merged data

}

*/

?>