Why can PHP only accept get but not POST value?

php generally uses get or post values. This article mainly shares with you why php can only accept get values ​​but cannot accept POST values. I hope it can help everyone.

1. Several methods for PHP to obtain POST data

Method 1. The most common method is: $_POST['fieldname'];

Explanation: Can only receive data submitted by Content-Type: application/x-www-form-urlencoded
Explanation: That is the data from the form POST

Method 2, file_get_contents("php://input");

Description:
Allows reading of the original data of POST.

(When using the interface testing tool, you can only use this method if the header is set to content-type: application/json.)
Compared with $HTTP_RAW_POST_DATA, it gives It puts less pressure on memory and does not require any special php.ini settings.
php://input cannot be used with enctype="multipart/form-data".
Explanation:
For POST data without specified Content-Type, you can use file_get_contents("php://input"); to obtain the original data.
In fact, this method can be used to receive any POST data using PHP. Regardless of Content-Type, including binary file streams is also acceptable.
So using method 2 is the safest method

Method 3, $GLOBALS['HTTP_RAW_POST_DATA'];

Instructions:
Total The $HTTP_RAW_POST_DATA variable is generated to contain the raw POST data.
This variable is only generated when data of unrecognized MIME type is encountered.
$HTTP_RAW_POST_DATA is not available for enctype="multipart/form-data" form data
If the posted data is not recognized by PHP, you can use $GLOBALS['HTTP_RAW_POST_DATA'] to receive it,
such as text /xml or soap, etc.
Explanation:
$GLOBALS['HTTP_RAW_POST_DATA'] stores the original data from POST.
$_POST or $_REQUEST stores data formatted by PHP in the form of key=>value.
But whether the POST data is saved in $GLOBALS['HTTP_RAW_POST_DATA'] depends on the centent-Type setting, that is, when POSTing data, the Content-Type must be explicitly specified: application/x-www-form-urlencoded, POST The data will be stored in $GLOBALS['HTTP_RAW_POST_DATA'].

Related recommendations:

Elaborate on the difference between get and post

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