1. <?php
  3. /**
  4. * Checks and asserts the runtime environment for backward compatibility.
  5. *
  6. * This script performs defensive checks to ensure the necessary PHP
  7. * features and extensions are available before proceeding with core logic.
  8. */
  10. // Check PHP version
  11. if (version_compare(PHP_VERSION, '7.4', '<')) {
  12. trigger_error("This script requires PHP 7.4 or higher.", E_USER_WARNING);
  13. exit(1); // Exit with an error code if the version is too old
  14. }
  16. // Check for specific extensions
  17. if (!extension_loaded('pdo_mysql')) {
  18. trigger_error("PDO MySQL extension is required.", E_USER_WARNING);
  19. exit(1);
  20. }
  22. if (!extension_loaded('json')) {
  23. trigger_error("JSON extension is required.", E_USER_WARNING);
  24. exit(1);
  25. }
  29. //Check for specific features
  30. if (!ini_get('session.use_cookies')) {
  31. trigger_error("Session cookies are disabled. Consider enabling them for proper session management.", E_USER_WARNING);
  32. }
  34. if (!ini_get('session.save_path')) {
  35. trigger_error("Session save path is not configured. Session management may be unreliable.", E_USER_WARNING);
  36. }
  39. //Check for max_execution_time
  40. if(intval(ini_get('max_execution_time')) < 30){
  41. trigger_error("max_execution_time must be at least 30 seconds for proper execution.", E_USER_WARNING);
  42. exit(1);
  43. }
  46. // Example: check if a specific constant is defined
  47. if (!defined('MY_CONSTANT')) {
  48. trigger_error("Constant 'MY_CONSTANT' is not defined.", E_USER_WARNING);
  49. //Potentially define a default value or exit.
  50. define('MY_CONSTANT', 'default_value');
  51. }
  53. // Further checks can be added here for other environment requirements...
  55. ?>

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