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// set processor and memory $myPC->setCpu("Pentium IV"); $myPC->setMemory(1024); // display configuration // result: "Current configuration: Pentium IV CPU, 1024 MB RAM" $myPC->getConfig(); >
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In PHP, a class is simply a group of related functions and variables It can be used to as a template to spawn specific instances, referred to as objects Every object has certain characteristics, or properties, and certain predefined functions, or methods These properties and methods of the object correspond directly with the variables and functions within the class definition Once a class has been defined, PHP allows you to spawn as many instances as you like from it Each of these instances is a completely independent object, with its own properties and methods, and can thus be manipulated independently of other objects This comes in handy in situations where you need to spawn more than one instance of an object for example, two simultaneous database links for two simultaneous queries, or two shopping carts In PHP, class definitions begin with the class keyword, followed by the class name (any string that conforms to PHP s variable naming rules) and the class members methods and properties within curly braces Class methods and properties are defined in the normal way, with an optional visibility declaration preceding each Three levels of visibility exist, ranging from most visible to least visible: public, protected, and private (learn more about visibility in the listing in 520: Copying Object Instances )
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In case you need to access functions or variables within the class definition itself, PHP offers the $this keyword, which is used to access class methods and properties that are local to the class Defining a class is only half the puzzle the other half consists of creating and using an instance of the class You use the new keyword to create a new instance of the class, which you can then assign to a PHP variable in the usual manner Class methods and properties can then be accessed via this variable, using -> notation to connect the two In the previous listing, the class is named Generic and it contains
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5: Working with Functions and Classes
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two properties ($cpu and $mem) and three methods (setMemory(), setCpu(), and getConfig()) The $myPC variable represents an instance of this class, with specific values set for the $cpu and $mem properties
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You want to automatically execute certain statements when an instance of a class is created or destroyed
Solution
Use a class constructor and/or destructor:
< php // define class class testClass { // PHP 5 constructor function __construct() { echo "Running the constructor\n"; } // PHP 5 destructor function __destruct() { echo "Running the destructor\n"; } } // create an object // result: "Running the constructor" $test = new testClass(); // then destroy it // result: "Running the destructor" unset($test); >
PHP Programming Solutions
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PHP makes it possible to automatically execute code when a new instance of a class is created, using a special class method called a constructor You can also run code when a class instance ends using a so-called destructor Constructors and destructors can be implemented by defining functions named __construct() and __destruct() within the class, and placing object (de)initialization code within them The previous listing illustrates how this might work, while the following listing contains a more concrete example of it in action:
< php // define class // to manually implement file locking class fileLock { // define properties private $file; // constructor public function __construct($file) { $this->file = $file; $this->lock(); } // method to create lock file public function lock() { // clear file cache clearstatcache(); // check if a lock file already exists // if not, create one // if it does, retry after a few seconds echo "Attempting to lock file\n"; if (!file_exists($this->file "lock")) { touch ($this->file "lock", time()) or die("ERROR: Could not create lock file!\n"); echo "File locked!\n"; } else { echo "Lock exists, retrying after 2 seconds\n"; sleep(2); $this->lock(); } }
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