Predefined variables

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Contents 1 HTTP GET variables: $_GET 2 HTTP POST variables: $_POST

PHP provides a large number of predefined variables that are available to any script which it runs.

Below is a list of some common variables that you might find useful.

HTTP GET variables: $_GET

The most common $_GET usage would be via form posting. When a form is posted via the "get" method (<form .... method="get">), the $_GET variable returns an array containing all your submitted form variables.

Example
form.php

<form action="" method="get" name="Form">
 <input type="text" name="Field1">
 <input type="submit" name="Submit" value="Submitted">
</form>
<pre>
<?php
if ($_GET['Submit']) {
    print_r($_GET);
}
?>
</pre>

This will return the following under the form when submitted:

Array
(
   [Field1] => Example Text
   [Submit] => Submitted
)

HTTP POST variables: $_POST

The most common $_POST usage would be via form posting. When a form is posted via the "post" method (<form .... method="post">), the $_POST variable returns an array containing all your submitted form variables.

Example
form.php

<form action="" method="post" name="Form">
 <input type="text" name="Field1">
 <input type="submit" name="Submit" value="Submitted">
</form>
<pre>
<?php
if ($_POST['Submit']) {
    print_r($_POST);
}
?>
</pre>

This will return the following under the form when submitted:

Array
(
   [Field1] => Example Text
   [Submit] => Submitted
)