The PHP superglobals $_GET and $_POST are used to collect form-data.
There are two ways the browser client can send information to the web server.
Tell where we have to sent your current web page information by default form action is on the similar page.
It defines that how data transmit from one to another place.
The GET method sends the encoded user information appended to the page request. The page and the encoded information are separated by the ? character.
http://www.phpkida.com/test.php?name1=value1&name2=value2
Try out following example by putting the source code in test.php script.
<?php
if(isset($_GET["name"]) && isset($_GET["age"])) {
echo "Welcome ". $_GET['name']. "<br />";
echo "You are ". $_GET['age']. " years old.";
exit();
}
?>
<html>
<body>
<form action = "<?php $_PHP_SELF ?>" method = "GET">
Name: <input type = "text" name = "name" />
Age: <input type = "text" name = "age" />
<input type = "submit" />
</form>
</body>
</html>
The POST method transfers information via HTTP headers. The information is encoded as described in case of GET method and put into a header called QUERY_STRING.
Example of The POST Method
<?php
if(isset($_POST["name"]) && isset($_POST["age"])) {
if (preg_match("/[^A-Za-z'-]/",$_POST['name'] )) {
die ("invalid name and name should be alpha");
}
echo "Welcome ". $_POST['name']. "<br />";
echo "You are ". $_POST['age']. " years old.";
exit();
}
?>
<html>
<body>
<form action = "<?php $_PHP_SELF ?>" method = "POST">
Name: <input type = "text" name = "name" />
Age: <input type = "text" name = "age" />
<input type = "submit" />
</form>
</body>
</html>
The PHP $_REQUEST variable contains the contents of both $_GET, $_POST, and $_COOKIE. We will discuss $_COOKIE variable when we will explain about cookies.
The PHP $_REQUEST variable can be used to get the result from form data sent with both the GET and POST methods.
<?php
if(isset($_REQUEST["name"]) || isset($_REQUEST["age"])) {
echo "Welcome ". $_REQUEST['name']. "<br />";
echo "You are ". $_REQUEST['age']. " years old.";
exit();
}
?>
<html>
<body>
<form action = "<?php $_PHP_SELF ?>" method = "POST">
Name: <input type = "text" name = "name" />
Age: <input type = "text" name = "age" />
<input type = "submit" />
</form>
</body>
</html>