Classes and objects
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Classes in object-oriented PHP combine variables and functions into groups called classes. Objects are instances of classes that use the class. Some advantages of using object-oriented PHP include grouping code, increased clarity, inheritance of classes, and automatic initialization of functions through constructors and destructors. A class syntax example is provided, as is an example class for a car that has a type property and getType method. Database connection using a class is also demonstrated.
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- Constructors and destructors are explained, as well as how to instantiate objects and use objects in arrays or pass them as references to functions.
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Classes and objects
- 2. Object Oriented PHP Class is the combination of variables and functions. Combined together into one group. Object is the example of the class who actually uses the class.
- 3. Advantage of Using Object Oriented PHP 1. Grouping of code. 2. More Clarity. 3. Classes can be inherited. 4. Automatically initialization of function. i.e. – Constructor and Destructors
- 4. Syntax :- Class class_name { function function_name ( ) { . code to be executed…….. . } }
- 5. Class class_name { function function_name 1 ( ) { code to be executed…….. } function function_name 2( ) { code to be executed…….. } }
- 6. Example :- class Car { var $type; function __construct($type) { $this->type = $type; } function getType() { return $this->type; } } $myCar = new Car("sports”); echo "Car type: " . $myCar->getType();
- 7. Database Connection Using Class class test { function __construct() { $this->c=mysql_connect(HOST,UNAME,PASS)or die("error in connection"); mysql_select_db(DB,$this->c); } function login($user,$paas ) { .......code }}
- 8. $obj= new test; $obj->insert ( ) ;
- 9. Public, Protected, Private Public – Access anywhere Protected – Access within class and Derived Class Private - Access only in class