Are there any specific PHP libraries or parsers that can handle duplicate keys in JSON files effectively?

When parsing JSON files in PHP, duplicate keys can cause issues as PHP arrays do not support duplicate keys. To handle duplicate keys effectively, you can use the `json_decode()` function with the `JSON_OBJECT_AS_ARRAY` option to decode the JSON string into an associative array. This will preserve all keys, including duplicates, by converting them into nested arrays.

$jsonString = '{"key1": "value1", "key2": "value2", "key1": "value3"}';
$array = json_decode($jsonString, true, 512, JSON_OBJECT_AS_ARRAY);
print_r($array);