The $_GET Variable
The
predefined $_GET variable is used to collect values in a form with
method="get"
Information
sent from a form with the GET method is visible to everyone (it will be
displayed in the browser's address bar) and has limits on the amount of
information to send.
When using method="get" in HTML forms, all variable
names and values are displayed in the URL.
The get method is not suitable
for very large variable values. It should not be used with values exceeding
2000 characters.
· The GET method produces a long string that appears in your server
logs, in the browser's Location: box.
· The GET method is restricted to send upto 1024 characters only.
· Never use GET method if you have password or other sensitive
information to be sent to the server.
· GET can't be used to send binary data, like images or word
documents, to the server.
· The data sent by GET method can be accessed using QUERY_STRING
environment variable.
· The PHP provides $_GET associative array to access all the
sent information using GET method.
Example:
<?php
if( $_GET["name"] ||
$_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>
Output:
Welcome
John!
You are 28 years old.
The $_POST Variable
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.
· The POST method does not have any restriction on data size to be
sent.
· The POST method can be used to send ASCII as well as binary data.
· The data sent by POST method goes through HTTP header so security
depends on HTTP protocol. By using Secure HTTP you can make sure that your
information is secure.
The PHP
provides $_POST associative array to access all the
sent information using GET method.
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.
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:
<?php
if( $_POST["name"] || $_POST["age"]
)
{
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>
Output:
Welcome
John!
You are 28 years old.
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