PHP $_POST variable

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).

Example

form.html The file code is as follows:

<html>
<head>
<meta charset="utf-8">
<title>php中文网(php.cn)</title>
</head>
<body>
<form action="welcome.php" method="post">
名字: <input type="text" name="fname">
年龄: <input type="text" name="age">
<input type="submit" value="提交">
</form>
</body>
</html>

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

http://www.php.cn/welcome.php

The "welcome.php" file can now collect form data via the $_POST variable (note that the names of the form fields automatically become keys in the $_POST array):

欢迎 <?php echo $_POST["fname"]; ?>!<br>
你的年龄是 <?php echo $_POST["age"]; ?>  岁。

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.

欢迎 <?php echo $_REQUEST["fname"]; ?>!<br>
你的年龄是 <?php echo $_REQUEST["age"]; ?>  岁。

Recommended related practical tutorials: "PHP $_POST variable"

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