1. <?php
  3. /**
  4. * Monitors the state of DOM elements on a webpage.
  5. *
  6. * @param string $url The URL of the webpage to monitor.
  7. * @param array $elements An associative array of element selectors.
  8. * Keys are element names, values are CSS selectors.
  9. * @param int $retry_interval The time in seconds to wait between retries.
  10. * @param int $max_retries The maximum number of retry attempts.
  11. */
  12. function monitorDOM($url, array $elements, int $retry_interval = 5, int $max_retries = 3) {
  14. for ($retry = 0; $retry < $max_retries; $retry++) {
  15. try {
  16. // Fetch the webpage content
  17. $html = file_get_contents($url);
  19. if ($html === false) {
  20. error_log("Failed to fetch URL: $url");
  21. return; // Exit if URL fetch fails
  22. }
  24. // Create a DOMDocument object
  25. $dom = new DOMDocument();
  26. @$dom->loadHTML($html); // Suppress warnings for malformed HTML
  28. // Check the state of each element
  29. foreach ($elements as $element_name => $selector) {
  30. $element = $dom->querySelector($selector);
  32. if ($element) {
  33. echo "$element_name: Element found.\n";
  34. } else {
  35. echo "$element_name: Element not found.\n";
  36. }
  37. }
  39. return; // Exit if all elements are found (or checked)
  40. } catch (Exception $e) {
  41. error_log("Error: " . $e->getMessage());
  42. if ($retry < $max_retries - 1) {
  43. echo "Retrying in $retry_interval seconds...\n";
  44. sleep($retry_interval);
  45. } else {
  46. echo "Monitoring failed after $max_retries retries.\n";
  47. }
  48. }
  49. }
  50. }
  53. // Example Usage:
  54. // Define the URL and the elements to monitor
  55. $url = 'https://www.example.com';
  56. $elements = [
  57. 'title' => 'h1',
  58. 'paragraph' => 'p',
  59. 'link' => 'a[href]' // Example: check for links with href attribute
  60. ];
  62. // Monitor the DOM with a 5-second retry interval and 3 retries
  63. monitorDOM($url, $elements, 5, 3);
  65. ?>

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