PHP $_POST Function

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In PHP, the predefined $_POST variable is used to collect values in a form with

method="post".

The $_POST Variable

The predefined $_POST variable is used to collect values from a form sent with

method="post".

Information sent from a form with the POST method is invisible to others and

has no limits on the amount of information to send.

Note: However, there is an 8 MB max size for the POST method, by default

(can be changed by setting the post_max_size in the php.ini file).

Example

<form action="welcome.php" method="post">

Name: <input type="text" name="fname">

Age: <input type="text" name="age">

<input type="submit">

</form>

When the user clicks the "Submit" button, the URL will look

like this:

http://http://www.zjjv.com///welcome.php

The "welcome.php" file can now use the $_POST variable to collect form data

(the names of the form fields will automatically be the keys in the $_POST

array):

Welcome <?php echo $_POST["fname"]; ?>!<br>

You are <?php echo $_POST["age"]; ?> years old.

When to use method="post"?

Information sent from a form with the POST method is invisible to others and

has no limits on the amount of information to send.

However, because the variables are not displayed in the URL, it is not

possible to bookmark the page.

The PHP $_REQUEST Variable

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

The $_REQUEST variable can be used to collect form data sent

with both the GET and POST methods.

Example

Welcome <?php echo $_REQUEST["fname"]; ?>!<br>

You are <?php echo $_REQUEST["age"]; ?> years old.

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