1. <?php
  3. /**
  4. * Parses JSON API responses.
  5. *
  6. * This function takes a JSON string as input and returns an associative array
  7. * representing the parsed data. Handles basic error checking.
  8. *
  9. * @param string $json_string The JSON string to parse.
  10. * @return array|null An associative array representing the parsed JSON data,
  11. * or null if parsing fails.
  12. */
  13. function parseJson(string $json_string): ?array
  14. {
  15. // Remove whitespace for cleaner parsing
  16. $json_string = trim($json_string);
  18. // Check if the input is valid JSON
  19. if (empty($json_string)) {
  20. return null; // Return null for empty input
  21. }
  23. $data = json_decode($json_string, true);
  26. if (json_last_error() !== JSON_ERROR_NONE) {
  27. error_log("JSON decode error: " . json_last_error_msg()); // Log the error
  28. return null; // Return null if decoding fails
  29. }
  31. return $data;
  32. }
  35. /**
  36. * Extracts data from a parsed JSON array.
  37. *
  38. * @param array $data The parsed JSON data (an associative array).
  39. * @param string $key The key to extract the value for.
  40. * @return mixed|null The value associated with the key, or null if the key doesn't exist.
  41. */
  42. function getJsonValue(array $data, string $key)
  43. {
  44. if (isset($data[$key])) {
  45. return $data[$key];
  46. }
  47. return null; // Return null if key is not found.
  48. }
  51. /**
  52. * Extracts nested data from a parsed JSON array.
  53. *
  54. * @param array $data The parsed JSON data.
  55. * @param array $keys An array of keys to traverse the nested structure.
  56. * @return mixed|null The value at the nested path, or null if the path is invalid.
  57. */
  58. function getNestedJsonValue(array $data, array $keys): ?mixed
  59. {
  60. $current = $data;
  61. foreach ($keys as $key) {
  62. if (is_array($current) && isset($current[$key])) {
  63. $current = $current[$key];
  64. } else {
  65. return null; // Path does not exist
  66. }
  67. }
  68. return $current;
  69. }
  72. // Example Usage (for testing)
  73. /*
  74. $json = '{
  75. "name": "John Doe",
  76. "age": 30,
  77. "city": "New York",
  78. "address": {
  79. "street": "123 Main St",
  80. "zip": "10001"
  81. },
  82. "hobbies": ["reading", "hiking"]
  83. }';
  85. $parsedData = parseJson($json);
  87. if ($parsedData) {
  88. echo "Name: " . getJsonValue($parsedData, "name") . "\n";
  89. echo "Age: " . getJsonValue($parsedData, "age") . "\n";
  90. echo "Street: " . getNestedJsonValue($parsedData, ["address", "street"]) . "\n";
  91. echo "Hobbies: " . implode(", ", $parsedData["hobbies"]) . "\n";
  92. } else {
  93. echo "Failed to parse JSON.\n";
  94. }
  95. */
  97. ?>

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