Functions MCQ question and answer with solution | PHP Programming

<?php
function sum($num1, $num2)
{
    $total = $num1 + $num2;
    echo "chr($total)"; 
}
$var1 = "sum";
$var1(5, 44);    
?>

<?php
function sum($num1, $num2)
{
    $total = $num1 + $num2;
    echo "cos($total)"; 
}
sum(5,-5);    
?>

<?php
function b()
{
    echo "b is executed";
}
function a()
{
    b();
    echo "a is executed";
    b();
}
a();
?>

<?php
function addFunction($num1, $num2)
{
    $sum = $num1 + $num2;
    return $sum;
}
$return_value = addFunction(10, 20);
echo "Returned value from the function : $return_value"
?>

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

span>
function one()
{
    echo " this works";
    function two()
    {
        echo "this too works";
    }
}
one();
two();
?>

<?php
function do($myString)
{
    echo strpos($myString, "donkey",0);
}
do("The donkey looks like a horse.");
?>

<?php
function onespan>()
{
    define("const","I am awesome!");
    echo constant("const");
}
one();
?>

<?php
    $title = "O'malley wins the heavyweight championship!";
    echo ucwords($title);
?>

<?php
    echo str_pad("Salad", 5)." is good.";
?>