What will be the output of the following PHP code?

<?php
function sayHello()
{
   echo "HelloWorld<br />";
}
$function_holder = "sayHello";
$function_holder();
?>

Which one of the following is the right way of defining a function in PHP?

A. function { function body }

B. data type functionName(parameters) { function body }

C. functionName(parameters) { function body }

D. function fumctionName(parameters) { function body }

Type Hinting was introduced in which version of PHP?

A. PHP 4

B. PHP 5

C. PHP 5.3

D. PHP 6

What will happen in this function call?

<?php
function calc($price, $tax)	
{
    $total = $price + $tax;
}
$pricetag = 15;
$taxtag = 3;
calc($pricetag, $taxtag);	
?>

A. Call By Value

B. Call By Reference

C. Default Argument Value

D. Type Hinting

What will be the output of the following PHP code?

<?php
function calc($price, $tax="")
{
    $total = $price + ($price * $tax);
    echo "$total"; 
}
calc(42);	
?>

A. Error

C. 42

D. 84