1. <?php
  3. /**
  4. * Enforces limits on command-line options with manual overrides.
  5. *
  6. * This script provides a temporary solution for limiting command-line option values.
  7. * It allows for manual overrides using environment variables.
  8. */
  10. /**
  11. * Function to validate and limit a command-line option.
  12. *
  13. * @param string $option_name The name of the option.
  14. * @param string $option_value The value of the option from the command line.
  15. * @param int|null $max_value The maximum allowed value. Null if no limit.
  16. * @param string|null $override_env The environment variable to override the limit.
  17. * @return string|false The validated option value, or false if validation fails.
  18. */
  19. function validateOption(string $option_name, string $option_value, ?int $max_value, ?string $override_env): string|false
  20. {
  21. // Check if the override environment variable is set.
  22. if ($override_env && getenv($override_env) !== null) {
  23. $override_value = (int)getenv($override_env);
  24. if ($override_value === false) {
  25. error_log("Invalid value for override environment variable: " . $override_env);
  26. return false;
  27. }
  28. $option_value = $override_value;
  29. }
  31. // Validate the option value based on the maximum value.
  32. if ($max_value !== null && (int)$option_value > $max_value) {
  33. error_log("Option '$option_name' value exceeds maximum allowed value: $max_value.");
  34. return false;
  35. }
  37. return $option_value;
  38. }
  40. // Example usage:
  41. $max_value = 100; // Maximum allowed value for the 'amount' option.
  42. $override_env = 'AMOUNT_OVERRIDE'; // Environment variable to override the limit.
  45. // Simulate command-line option parsing (replace with your actual parsing logic).
  46. $amount = $_GET['amount'] ?? 50; // Default value if not provided.
  48. // Validate the 'amount' option.
  49. $validated_amount = validateOption('amount', $amount, $max_value, $override_env);
  51. if ($validated_amount !== false) {
  52. echo "Validated amount: " . $validated_amount . "\n";
  53. // Use the validated amount.
  54. } else {
  55. echo "Invalid amount provided.\n";
  56. }
  58. //Another example
  59. $filename = $_GET['filename'] ?? 'default.txt';
  62. //Validate filename
  63. $validated_filename = validateOption('filename', $filename, null, $override_env);
  65. if ($validated_filename !== false) {
  66. echo "Validated filename: " . $validated_filename . "\n";
  67. } else {
  68. echo "Invalid filename provided.\n";
  69. }
  72. ?>

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