<?php

/**

* Replaces values in a URL list with user input, including basic validation.

*

* @param array $urlList An array of URLs with placeholders. Example: ['https://example.com/{id}', 'https://example.com/{name}']

* @param array $userInput An associative array of user input. Example: ['id' => '123', 'name' => 'JohnDoe']

* @return array An array of URLs with replaced values, or an error message if validation fails.

*/

function replaceUrlValues(array $urlList, array $userInput): array

{

$replacedUrls = [];

foreach ($urlList as $url) {

// Basic validation: check if the URL contains placeholders

if (strpos($url, '{') === false || strpos($url, '}') === false) {

$replacedUrls[] = $url; // No placeholders, just add the original URL

continue;

}

$replacedUrl = $url;

$valid = true;

foreach ($userInput as $placeholder => $value) {

// Validate that the placeholder exists in the URL

if (strpos($replacedUrl, '{' . $placeholder . '}') === false) {

return ['error' => "Invalid placeholder: " . $placeholder];

}

// Replace the placeholder with the user input

$replacedUrl = str_replace('{' . $placeholder . '}', $value, $replacedUrl);

}

$replacedUrls[] = $replacedUrl;

}

return $replacedUrls;

}

// Example usage:

$urlList = ['https://example.com/{id}', 'https://example.com/{name}', 'https://example.com/{city}'];

$userInput = ['id' => '456', 'name' => 'JaneSmith'];

$result = replaceUrlValues($urlList, $userInput);

if (isset($result['error'])) {

echo json_encode($result); // Output error message as JSON

} else {

echo json_encode($result); // Output replaced URLs as JSON

}

?>