Q:

PHP find output programs (Constructors and Destructors) | set 2

belongs to collection: PHP Find Output Programs

robaa
Save to bookmark
|
2022-11-16
|
  440 
0

Find the output of PHP programs | Constructors & Destructors | Set 2: Enhance the knowledge of PHP Constructors & Destructors by solving and finding the output of some PHP programs.

Question 1:

<?php
    class Sample
    {
        private $A;
        private $B;
    
        public function Sample()
        {
            $this->A = 10;
            $this->B = 20;
        }
        public function Sample($A, $B)
        {
            $this->A = $A;
            $this->B = $B;
        }
        public function print ()
        {
            echo "A: $this->A<br>";
            echo "B: $this->B<br>";
        }
    }
    
    $OB1 = new Sample();
    $OB1->print();
    
    $OB2 = new Sample(30, 40);
    $OB2->print();
?>

Question 2:

<?php
class Sample
{
    private $A;
    private $B;

    public function Sample():
        int
        {
            $this->A = 10;
            $this->B = 20;
            return 0;
        }
        public function print ()
        {
            echo "A: $this->A<br>";
            echo "B: $this->B<br>";
        }
    }

    $OB1 = new Sample();
    $OB1->print();
?>

Question 3:

<?php
    class Sample
    {
        public function Sample()
        {
            print ("Constructor Called<br>");
        }
        public function ~Sample()
        {
            print ("Destructor Called<br>");
        }
    }
    
    $OB = new Sample();
?>

Question 4:

<?php
    class Sample
    {
        public function Sample()
        {
            print ("Constructor Called<br>");
        }
        public function __DESTRUCT()
        {
            print ("Destructor Called<br>");
        }
    }
    
    $OB = new Sample();
?>

Question 5:

<?php
    class Sample
    {
        public $VAL;
    
        public function __construct()
        {
            $this->VAL = 10;
        }
        public function Sample($V)
        {
            $this->VAL = $V;
        }
        public function print ()
        {
            print ("$this->VAL<br>");
        }
    }
    
    $OB1 = new Sample();
    $OB2 = new Sample(20);
    
    $OB1->print();
    $OB2->print();
?>
Php programming,
login and add your own answer to this question

All Answers

robaa
2022-11-16
need an explanation for this answer? contact us directly to get an explanation for this answer

Answer 1:

Output:

PHP Fatal error:  Cannot redeclare Sample::Sample() 
in /home/main.php on line 12

Explanation:

The above program will generate a fatal error because we cannot perform constructor overloading using PHP.

Answer 2:

Output:

PHP Fatal error:  Constructor Sample::Sample() cannot 
declare a return type in /home/main.php on line 2

Explanation:

The above program will generate syntax error because the constructor does not support return type in PHP.

Answer 3:

Output:

PHP Parse error:  syntax error, unexpected '~' 
in /home/main.php on line 8

Explanation:

The above program will generate syntax error, we cannot call destructor using tilde '~' symbol. To implement destructor in a class, we need to use the __destruct() magic function.

Answer 4:

Output:

Constructor Called
Destructor Called

Explanation:

In the above program, we created a class Sample that contains constructor and destructor, And we created an object of Sample class then constructor and destructor both will be called and print messages on the webpage.

A constructor is called when an object gets created while the destructor is called when the scope of the object gets finished.

Answer 5:

Output:

10
10

Explanation:

In the above program, we defined two constructors, default constructor using __construct() magic function and another is parameterized constructor. Then we created two objects $OB1 and $OB2, both will call default constructor __construct. If we defined more than one constructor in a class, but constructor defined using __construct() will always call, other constructors can be defined but cannot be called.

need an explanation for this answer? contact us directly to get an explanation for this answer

total answers (1)

PHP Find Output Programs
This question belongs to these collections

Similar questions

need a help?

find thousands of online teachers now
PHP find output programs (Constructors and Destruc... >>
<< PHP find output programs (Constructors and Destruc...