In some code, what does php: // input mean?

For example, I see a piece of code {code...} in a library. what does php: input mean? For example, I see a piece of code in a library.

global $HTTP_RAW_POST_DATA;if (empty($HTTP_RAW_POST_DATA)) {    // workaround for a bug in PHP 5.2.2 - http://bugs.php.net/bug.php?id=41293    $data = file_get_contents('php://input');} else {    $data = $HTTP_RAW_POST_DATA;}

Herephp://inputWhat does that mean?

Reply content:

For example, I see a piece of code in a library.

global $HTTP_RAW_POST_DATA;if (empty($HTTP_RAW_POST_DATA)) {    // workaround for a bug in PHP 5.2.2 - http://bugs.php.net/bug.php?id=41293    $data = file_get_contents('php://input');} else {    $data = $HTTP_RAW_POST_DATA;}

Herephp://inputWhat does that mean?

Reference Manual content
Http://php.net/manual/zh/wrappers.php...

Obtain the post input stream data. The post type cannot be multipart/form-data.
` $ Input = file_get_contents ('php: // input ');
Var_dump ($ input); exit;
?> '
Post data to this file and you can see that the data passes through urlencode.

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