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