How to Properly Access JSON Data from PHP POST Requests?

How to Extract JSON Data from a PHP POST Request

When submitting JSON data to a PHP script via a POST request, accessing the body can be confusing. Using var_dump($_POST); will return an empty array.

Solution: Using php://input

To access the request body, PHP provides php://input:

$entityBody = file_get_contents('php://input');

This stream contains the raw POST data. You can also use stream_get_contents(STDIN) as STDIN is an alias for php://input.

注意事项:

• php://input is not seekable, so it can only be read once.
• For large datasets, consider buffering it with a temporary stream, such as:

function detectRequestBody() {
    $rawInput = fopen('php://input', 'r');
    $tempStream = fopen('php://temp', 'r+');
    stream_copy_to_stream($rawInput, $tempStream);
    rewind($tempStream);

    return $tempStream;
}

Limitations:

php://input is unavailable for requests with Content-Type: multipart/form-data, as PHP handles multipart data natively.

Example:

To access the JSON object {a:1} in your PHP code, use:

$json = json_decode(file_get_contents('php://input'));
echo $json->a; // 1

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