What does _post mean in php

_post in php refers to the "$_POST" variable. In PHP, this variable is used to collect values from the form with "method='post'"; information sent from the form with the POST method , is invisible to anyone, and there is no limit on the amount of messages you can send.

The operating environment of this article: windows7 system, PHP7.1 version, DELL G3 computer

PHP $_POST variable

In PHP, the predefined $_POST variable is used to collect values from the form with method='post'. Information sent from a form with the POST method is invisible to anyone (it does not appear in the browser's address bar), and there is no limit on the amount of information sent.

In PHP, the predefined $_POST variable is used to collect values from the form with method="post".

$_POST variable

The predefined $_POST variable is used to collect values from the form with method="post".

Information sent from a form with the POST method is invisible to anyone (will not be displayed in the browser's address bar), and there is no limit on the amount of information sent.

Note: However, by default, the maximum amount of information sent by the POST method is 8 MB (can be changed by setting post_max_size in the php.ini file).

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Example

form.html file code is as follows:

    
  
 名字:  年龄:   
  

When the user clicks the "Submit" button, the URL will be similar to the following:

//m.sbmmt.com/welcome.php

"welcome.php" file now Form data can now be collected through the $_POST variable (please note that the names of the form fields will automatically become keys in the $_POST array):

Welcome !

Your age is years.

Access the demonstration through the browser as follows:

When to use method="post"?

Information sent from a form with the POST method is not visible to anyone, and there is no limit on the amount of information sent.

However, since the variable does not appear in the URL, the page cannot be bookmarked.

PHP $_REQUEST variable

The predefined $_REQUEST variable contains the contents of $_GET, $_POST and $_COOKIE.

$_REQUEST variable can be used to collect form data sent via GET and POST methods.

Example

You can modify the "welcome.php" file to the following code, which can accept $_GET, $_POST and other data.

Welcome !

Your age is Years old.

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