parent::constructor($value)


Example:



class parentClass
{
     function __construct()
   {
    }
}


class chClass extends parentClass
{
   function __construct()
   {
      parent::__construct(); //call a constructor for a parent class
       }
}

How do I find out the number of parameters passed into function?


func_num_args — Returns the number of arguments passed to the function.


Example:

<?php
function test()
{
    $number_of_args = func_num_args();
    echo "Number of arguments: $number_of_args";
}


test ("a","b");
?>

Ternary conditional operator:
Expression preceding the ? is evaluated, if it’s true, then the expression preceding  the : is executed, otherwise, the expression following : is executed.


Syntax:
Condition ? value if true :value if false;


Example:
<?php
$id = isset($_POST['name']) ?  $_POST['name'] : false;
?>

Yes you can compare string and integer in PHP  as  internally PHP will cast everything to the integer type, so numbers 100 and 100 will be compared.

In this section, I will explain how to define a constant in PHP.


define("Test","Hello Rajesh Sharma! How are you today?");

The constant() function returns the value of a constant.
Syntax:
<?php
//define a constant
define("Test","Hello Rajesh Sharma! How are you today?");


echo constant("Test");
?>

I am trying to assign a variable the value of 0123, but it keeps coming up with a different number, what’s the problem?