PHP have two built-in functions, json_decode().
Encoding and Decoding
Encoding is used to bundle data with respect to a particular format. This process will be required to preserve data consistency. Decoding is a reverse process which reverts encoded data back to its original form.
json_decode() json_encode()
The json_encode() function is used to encode a value to JSON format.
The json_decode() function is used to decode or convert a JSON object to a PHP object.