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HTTP headers are slightly finicky but rather powerful sets of functionality. The most important aspect to remember about headers is that they can be called only before any output has been written to the web page. If you attempt to call a header after output has been sent to the page, you will generate an error; hence, your script will fail on you. That being said, the functionality of headers is rather powerful. You can use them to control everything, including setting the current page location, finding out what file format is being displayed, and managing all aspects of the browser cache. In the following examples, you will learn how to use the header() function in a variety of ways. The header() function s prototype is as follows: void header ( string string [, bool replace [, int http_response_code]] )

Your next steps are to modify update.inc.php to check whether the login credentials supplied via the login form are valid; if they are, you set $_SESSION['loggedin'] to 1, which causes all administrative links and actions to become available to the user. In update.inc.php, you add an else if block that checks whether it was the POST method that submitted the login form. You do this by checking whether the value of $_POST['action'] is set to login and whether the values of the username and password fields were submitted with values.

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So far, we have declared all properties public, implicitly or otherwise. Public access is the default setting for methods and for properties if you use the old var keyword in your property declaration. Elements in your classes can be declared public, private, or protected: Public properties and methods can be accessed from any context. A private method or property can only be accessed from within the enclosing class. Even subclasses have no access. A protected method or property can only be accessed from within either the enclosing class or from a subclass. No external code is granted access. So how is this useful to us Visibility keywords allow us to expose only those aspects of a class that are required by a client. This sets a clear interface for your object. By preventing a client from accessing certain properties, access control can also help prevent bugs in your code. Imagine, for example, that we want to allow ShopProduct objects to support a discount. We could add a $discount property and a setDiscount() method. // ShopProduct class public $discount = 0; // ... function setDiscount( $num ) { $this->discount=$num; } Armed with a mechanism for setting a discount, we can create a getPrice() method that takes account of the discount that has been applied.

One of the more common uses for HTTP headers is redirecting a script. By using headers inside processing scripts, you can force the browser to return to any page you want. We prefer to use headers to control exception handling within process scripts. The following script makes sure that all input coming from a form is not blank.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <title>Sample 12.5</title> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /> </head> <body> <form action="sample12_5.php" method="post"> Name: <input type="text" name="yourname" maxlength="150" /><br /> <input type="submit" value="Submit" style="margin-top: 10px;" /> </form> </body> </html> The form in the previous block of code will then call the processing statement as follows: < php //sample12_5.php //You will assume that this scripts main focus is to validate against a blank entry. if (trim ($_POST['yourname']) == ""){ header ("Location: sample12_5.html"); exit; } //If you have a value, then it would do something with said value . Like, say, output it. echo $_POST['yourname']; >

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