Is there a way to get post parameters in php?

Several ways for PHP to obtain post parameters

The data type recognized by PHP by default is application/x-www .form-urlencoded standard data type.

1. $_POST['paramName'] Only when the Content-Type is application/x-www-form-urlencoded or multipart/form-data, PHP will change the HTTP request packet The corresponding part of the body data is filled in the $_POST global variable, and PHP ignores other situations. The data filled into the $_POST array is the result of urldecode() parsing.

2. file_get_contents("php://input") is suitable for most types of Content-type

php://input allows reading the raw data of POST. It puts less pressure on memory than $HTTP_RAW_POST_DATA and does not require any special php.ini settings. php://input cannot be used with enctype="multipart/form-data".

3. $GLOBALS['HTTP_RAW_POST_DATA']; always generates $HTTP_RAW_POST_DATA variable containing the original POST data. This variable is only generated when data of an 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. You need to set the always_populate_raw_post_data value in php.ini to On so that PHP will always fill in the POST data into the variable $http_raw_post_data.

Look at the official documentation, in higher versions, this variable $HTTP_RAW_POST_DATA is deprecated
This feature wasDEPRECATEDin ​​PHP 5.6.0, andREMOVEDas of PHP 7.0.0. In general,php://inputshould be used instead of $HTTP_RAW_POST_DATA.

Summary:

1, Coentent-Type is only used when the value is application/x-www-data-urlencoded and multipart/form-data. PHP will fill the corresponding data in the http request packet into the global variable $_POST

2. When PHP does not recognize the Content-Type type, it will fill in the corresponding data in the http request packet into the variable $. HTTP_RAW_POST_DATA

3, only when the Coentent-Type is not multipart/form-data, PHP will fill in the corresponding data in the http request packet into php: //input, otherwise it will be in other cases. The length of the padding, specified by Coentent-Length.

4. Only when the Content-Type is application/x-www-data-urlencoded, the php://input data is consistent with the $_POST data.

5, php://input data is always the same as $HTTP_RAW_POST_DATA. They only read data whose Content-Type is not multipart/form-data, but php://input is more efficient than $HTTP_RAW_POST_DATA. , and no special setting is required for php.ini

6. PHP will fill in the query_path part of the PATH field into the global variable $_GET. Normally, the body of an http request submitted by the GET method is empty.

7, php://input cannot read $_GET data. This is because the $_GET data is written in the PATH field of the http request header as query_path, rather than in the body part of the http request.

8. If it is application/x-www-form-urlencoded and multipart/form-data format, use $_POST;

9. If it cannot be obtained, such as text/xml, application /json, soap, use file_get_contents('php://input');

Recommended tutorial: "PHP Tutorial"

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