Php: // What is the difference between input and $ _ POST in php?

Source: Internet
Author: User
Tags http post http request ini

Let's first look at two instances.

Example: php: // input

The code is as follows: Copy code

<Form action = "post. php" method = "post">
<Input type = "text" name = "user">
<Input type = "password" name = "password">
<Input type = "submit">
</Form>

Post. php

The code is as follows: Copy code

<? Echo file_get_contents ("php: // input");?>

Example: post

Html

The code is as follows: Copy code

<Form action = "welcome. php" method = "post">
Enter your name: <input type = "text" name = "name"/>
Enter your age: <input type = "text" name = "age"/>
<Input type = "submit"/>
</Form>

Welcome. php

The code is as follows: Copy code
Welcome <? Php echo $ _ POST ["name"];?>. <Br/>
You are <? Php echo $ _ POST ["age"];?> Years old!

Variables sent through http post are not displayed in the URL.

When we use $ _ POST to receive the information transmitted from the page, we can use php: // input to accept the value. What is the difference between them?

First, when $ _ POST and php: // input can get the value, $ HTTP_RAW_POST_DATA is blank;
$ Http_raw_post_data is a built-in global variable in PHP. It is used. PHP fills in the POST data as is in the variable $ http_raw_post_data when the Content-Type cannot be recognized. It cannot read POST data whose Content-Type is multipart/form-data. You need to set the always_populate_raw_post_data value in php. ini to On, and PHP will always fill in the POST data with the variable $ http_raw_post_data.

Then $ _ POST organizes the submitted data in an associated array and performs encoding, such as urldecode or even encoding conversion;
Php: // input: raw POST data that has not been processed is obtained by reading files through the input stream;

Php: // input allows reading original POST data. Compared with $ HTTP_RAW_POST_DATA, it puts less pressure on the memory and does not require any special php. ini settings. Php: // input cannot be used for enctype = "multipart/form-data ";

Php: // input cannot read $ _ GET data. The reason is that the $ _ GET data is written in the PATH field of the http request header as query_path, rather than in the http request body.

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