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Functions MCQ question and answer with solution | PHP Programming

Learn Functions MCQ Questions and answers with easy and logical explanations. Functions MCQ in PHP programming provides all type of technical mcq questions which is important for technical exams, cumpus exams and other entrance examination Page-3 section-1

21
What will be the output of the following PHP code? 
<?php
function calc($price, $tax="")
 {
    $total = $price + ($price * $tax);
    echo "$total"; 
 }
calc(42);    
?>
Discuss
Answer & Solution
Answer: Option C
Solution:
You can designate certain arguments as optional by placing them at the end of the list and assigning them a default value of nothing.
22
What will be the output of the following PHP code? 
<?php
    function a()
    {
        function b()
        {
            echo 'I am b';
        }
        echo 'I am a';
    }
    a();
    a();
?>
Discuss
Answer & Solution
Answer: Option D
Solution:
This will be the output- I am a Fatal error: Cannot redeclare b()
23
What will be the output of the following PHP code? 

<?php
    function a()
    {
        function b()
        {
            echo 'I am b';
        }
        echo 'I am a';
    }
    b();
    a();
?>
Discuss
Answer & Solution
Answer: Option C
Solution:
This will be the output- Fatal error: Call to undefined function b(). You cannot call a function which is inside a function without calling the outside function.
24
What will be the output of the following PHP code? 

<?php
$op2 = "blabla";
function foo($op1)
{
        echo $op1;
        echo $op2;
}
foo("hello");
?>
Discuss
Answer & Solution
Answer: Option C
Solution:
If you want to put some variables in function that was not passed by it, you must use “global”. Inside the function type global $op2.
25
What will be the output of the following PHP code? 
<?php
function foo($msg)
{
    echo "$msg";
}
$var1 = "foo";
$var1("will this work");
?>
Discuss
Answer & Solution
Answer: Option D
Solution:
It is possible to call a function using a variable which stores the function name.
26
What will be the output of the following PHP code? 
<?php
   echo "chr(52)";
?>
Discuss
Answer & Solution
Answer: Option D
Solution:
The chr() function returns a character from the specified ASCII value. Since the ASCII value of 4 is 52, thus 4 was displayed.
27
What will be the output of the following PHP code? 
<?php
    echo ord ("hi");
?>
Discuss
Answer & Solution
Answer: Option C
Solution:
The ord() function returns the ASCII value of the first character of a string. The ASCII value of h is 104, thus 104 was displayed.
28
What will be the output of the following PHP code? 
<?php
   echo(atan(0.50));
?>
Discuss
Answer & Solution
Answer: Option C
Solution:
The atan() function returns the arc tangent of arg as a numeric value between -Pi/2 and Pi/2 radians.
29
What will be the output of the following PHP code? 
<?php
   define("GREETING","Hello you! How are you today?");
   echo constant("GREETING");
?>
Discuss
Answer & Solution
Answer: Option A
Solution:
The define() function defines a constant.
30
What will be the output of the following PHP code? 
<?php
define("GREETING1","Hello you! How are you today?");
define("GREETING2","Hello you! How are you today?");
define("GREETING3","Hello you! How are you today?");
echo defined("GREETING");
?>
Discuss
Answer & Solution
Answer: Option B
Solution:
The defined() function checks whether a constant exists.