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What is Abstract (base) class in PHP OOP's?

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What is Abstract (base) class in PHP OOP's?
posted Oct 22, 2014 by anonymous

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1 Answer

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The abstract classes and methods are used to create a model of minimum required methods which must be defined in normal sub-classes derived from an abstract class (with extends).
An abstract class is created with the abstract keyword.
An abstract class cannot be instantiated, can only be inherited by other sub-classes extended from it.

The abstract methods are declared with the abstract keyword, and cannot have an implementation, they simply declare the method's signature.

abstract public function methodName($arguments);

Abstract methods are only created in an abstract class.

  • Example:
    In this example is created an abstract class with a property ($name), an abstract method ( greetName() ) and a normal method ( setName() ).

    <?php
    // AbstractClass class
    abstract class AbstractClass {
    protected $name;

    // declare an abstract method
    abstract public function greetName($greet);

    // define a normal method
    public function setName($name) {
    $this->name = $name; // sets the value of $name property
    }
    }
    ?>

answer Oct 29, 2014 by Vrije Mani Upadhyay
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