Working with classes and objects
- Preface
- Memory management
- Working with Variables
- Writing Functions
- Writing Classes
- Working with Resources
- Working with INI settings
- Working with streams
- The "counter" Extension - A Continuing Example
- The PHP 5 build system
- Extension structure
- PDO Driver How-To
- Extension FAQs
- Zend Engine 2 API reference
- Zend Engine 2 Opcodes
- Zend Engine 1
Коментарии
One of the things that I believe should be done in the "__construct" part of a class object is the definition of your variables which are going to be used outside of the class itself. (Like the $_SESSION information or if you are going to be working with a database and you want to be able to monitor the incoming information and you always want it to go to the same variable.) I came up with the following which I thought was kind of clever and I just wanted to pass it along so someone else doesn't have to re-invent the wheel. Put this into your "__construct" function and set the $checkVar to be what is on your forms followed by what name you want the $_SESSION variable (or any variable for that matter) to be set it. (We deal with small databases so the $_SESSION variable doesn't get all that large.)
$checkVar['prevPage'] = 'PREVPAGE';
$checkVar['newPWD'] = 'NEWPWD';
$checkVar['confirmPWD'] = 'CONFIRMPWD';
foreach( $checkVar as $key => $value ){
if( isset($_POST[$key]) ){ $_SESSION[$value] = $_POST[$key]; }
else if( isset($_GET[$key]) ){ $_SESSION[$value] = $_GET[$key]; }
else if( isset($_SESSION[$value]) ){} # Do nothing
else { $_SESSION[$value] = ""; }
}
Here you can see I am keeping track of the previous page, the user's new password, and the confirmation of that password. The FOREACH loop checks to see if the $_POST variable is set to the key and if so it sets the $_SESSION variable. The thing is - it uses the associative array to keep track of which $_POST or $_GET entry to use. Further, if the neither of those two are set it checks first to see if the $_SESSION variable was already set and then if not it at least sets it to a null string so it is defined. This keeps us from having the error log messages about us using undefined variables too.
I hope everyone likes this and can use it.