Library tutorials & articles
An Introduction to PHP
Cookies in PHP
Setting Cookies
The world wide web is stateless, which means it remembers nothing about you. The usual way of keeping track of user preferences is to use cookies. If you are setting a cookie, you must do it before the headers are written, so must be set at the very start of the document. Cookies are set in PHP using the setcookie function.
setcookie(name, value, expire, path, domain);
The cookies are not actually set in the page where they are written, but will be set in any subsequent pages. The following example sets a userName cookie, that expires after one hour.
<?php
// Set a cookie that expires in one hour
setcookie("userName", $name, time()+3600);
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>PHP Cookies</title>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
</head>
<body>
<p>
A cookie was set on this page, and will be active when
the client has sent the cookie back to the server.
</p>
</body>
</html>
Reading Cookies
When a cookie is set, PHP uses the cookie name as a variable with the appropriate value. Accessing a cookie is just a simple case of referring to the cookie name as a variable. You can use the isset function to determine if a cookie has been set. The following example tests if the userName cookie has been set, and prints an appropriate message.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>Accessing a Cookie</title>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
</head>
<body>
<p>
<?php
if (isset($userName))
print "Welcome " . $userName . "<br>";
else
print "You are not logged in <br>";
?>
</p>
</body>
</html>
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but i need to send values in one folder to another
Yes, I think you're correct, although you could easily have a line like this:
to get around that problem. Which I think is what's missing from this tutorial
In the PHP file should it be "$_POST["num"]" ?
instead of just $num?
I have in php a header which brings a save as box , but when file is down loaded it contains the 6 blank spaces at the start of of document .
I have to avoid storing these blank spaces.Please help me to solve this problem.
You can also do string concatenation like
$h = "Hello";
$w = "World";
$message = "$h $w";
This thread is for discussions of An Introduction to PHP.