How can one optimize the performance of indexing processes in PHP to ensure external pages are indexed efficiently?

To optimize the performance of indexing processes in PHP for external pages, it is important to use asynchronous requests to fetch multiple pages concurrently. This can be achieved using libraries like Guzzle or cURL to send HTTP requests asynchronously. Additionally, caching responses from external pages can help reduce the load on the server and improve indexing efficiency. 

// Using Guzzle library to send asynchronous requests
require 'vendor/autoload.php';

use GuzzleHttp\Client;
use GuzzleHttp\Promise;

$client = new Client();

$urls = ['https://example.com/page1', 'https://example.com/page2', 'https://example.com/page3'];

$promises = [];
foreach ($urls as $url) {
    $promises[$url] = $client->getAsync($url);
}

$results = Promise\settle($promises)->wait();

foreach ($results as $url => $result) {
    $response = $result['value'];
    // Process the response and index the page
}

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