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PHP OOPs Concepts
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- PHP 5 allows developers to declare constructor methods for classes.
- Constructor is suitable for any initialization that the object may need before it is used.
- We can design constructor using “__construct” or same name as class name.
- Parent constructors are not called implicitly if the child class defines a constructor. In order to run a parent constructor, a call to parent::__construct().
Example 1
<?php
class Example
{
public function __construct()
{
echo "Hello tutorialspro";
}
}
$obj = new Example();
$obj = new Example();
?>
Output:
Hello tutorialsproHello tutorialspro
Example 2
<?php
class demo
{
public function demo()
{
echo "constructor1...";
}
}
class demo1 extends demo
{
public function __construct()
{
echo parent::demo();
echo "constructor2...";
}
}
$obj= new demo1();
?>
Output:
constructor1…constructor2…
DESTRUCTOR
- PHP 5 introduces a destructor concept similar to that of other object-oriented languages, such as C++.
- The destructor method will be called as soon as all references to a particular object are removed or when the object is explicitly destroyed in any order in shutdown sequence.
- We create destructor by using “__destruct” function.
Example 1
<?php
class demo
{
public function demo()
{
echo "constructor1...";
}
}
class demo1 extends demo
{
public function __construct()
{
echo parent::demo();
echo "constructor2...";
}
public function __destruct()
{
echo "destroy.....";
}
}
$obj= new demo1();
?>
Output:
constructor1…constructor2…destroy…