PHP $_POST Function
The $_POST Function
The built-in $_POST function 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://www.w3schools.com/welcome.php
The "welcome.php" file can now use the $_POST function 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 Function
The PHP built-in $_REQUEST function contains the contents of both
$_GET, $_POST, and $_COOKIE.
The $_REQUEST function 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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