Parsing JSON Data from Javascript to PHP
Sending JSON data from Javascript in the browser to a server and having it parsed in PHP entails several steps.
1. Creating the JSON String
In Javascript, use the JSON.stringify() method to convert an object to a JSON string. This string will contain the data to be sent to the server.
2. Sending the JSON Data with AJAX
Utilize Javascript's XMLHttpRequest object to establish an AJAX connection to the server. Set the Content-type header to either:
- "application/json" if you want the server to directly access the JSON data using php://input.
- "application/x-www-form-urlencoded" if you wish to create a POST string and access the data through $_POST in PHP.
3. Parsing the JSON Data in PHP
If you used the "application/json" header, read the raw POST data using:
$str_json = file_get_contents('php://input');
If you used the "application/x-www-form-urlencoded" header, access the data via $_POST, but remember to first create a POST string in Javascript. Decode the JSON string using json_decode().
Pitfalls to Avoid
- Don't attempt to access data with the wrong content type (e.g., trying to access JSON data via $_POST without using php://input).
- Ensure that the POST data is correctly formatted according to the content type being used.
References
- Accessing POST data in PHP: [https://stackoverflow.com/questions/8224855/how-to-access-post-data-in-php](https://stackoverflow.com/questions/8224855/how-to-access-post-data-in-php)
- Application/JSON content type: [https://www.ietf.org/rfc/rfc4627.txt](https://www.ietf.org/rfc/rfc4627.txt)
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