What will be the output of the following php code php function calc($price $tax= )

What will be the output of the following PHP code?

A. Error

B. 0

C. 42

D. 84

Answer: Option C

Related Questions on Functions

This set of PHP Multiple Choice Questions & Answers (MCQs) focuses on “Functions – 1”.

1. What will be the output of the following PHP code?

2.     function calc($price, $tax="")

3.     {

4.         $total = $price + ($price * $tax);

5.         echo "$total"; 

6.     }

7.     calc(42);    

8.     ?>

a) Error
b) 0
c) 42
d) 84
View Answer

Answer: c
Explanation: You can designate certain arguments as optional by placing them at the end of the list and assigning them a default value of nothing.

2. What will be the output of the following PHP code?

2.     function a()

3.     {

4.         function b()

5.         {

6.             echo 'I am b';

7.         }

8.         echo 'I am a';

9.     }

10.     a();

11.     a();

12.     ?>

a) I am b
b) I am bI am a
c) Error
d) I am a Error
View Answer

Answer: d
Explanation: This will be the output- I am a Fatal error: Cannot redeclare b()

3. What will be the output of the following PHP code?

2.     function a()  

3.     {

4.         function b()

5.         {

6.             echo 'I am b';

7.         }

8.         echo 'I am a';

9.     }

10.     b();
    

11.     a();

12.     ?>

a) I am b
b) I am bI am a
c) Error
d) I am a Error
View Answer

Answer: c
Explanation: 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.

4. What will be the output of the following PHP code?

2.     $op2 = "blabla";

3.     function foo($op1)

4.     {

5.         echo $op1;

6.         echo $op2;

7.     }

8.     foo("hello");

9.     ?>

a) helloblabla
b) error
c) hello
d) helloblablablabla
View Answer

Answer: c
Explanation: 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.

5.What will be the output of the following PHP code?

2.         function foo($msg)

3.         {

4.             echo "$msg";

5.         }

6.         $var1 = "foo";

7.         $var1("will this work");

8.     ?>

a) error
b) $msg
c) 0
d) will this work
View Answer

Answer: d
Explanation:It is possible to call a function using a variable which stores the function name.

6. What will be the output of the following PHP code?

2.        echo "chr(52)";

3.     ?>

a) 1
b) 2
c) 3
d) 4
View Answer

Answer: d
Explanation: The chr() function returns a character from the specified ASCII value. Since the ASCII value of 4 is 52, thus 4 was displayed.

7. What will be the output of the following PHP code?

2.         echo ord ("hi");

3.     ?>

a) 106
b) 103
c) 104
d) 209
View Answer

Answer: c
Explanation: 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.

8. What will be the output of the following PHP code?

2.       echo(atan(0.50));

3.   ?>

a) 0.11845976421345
b) 0.23568451142521
c) 0.46364760900081
d) 1
View Answer

Answer: c
Explanation: The atan() function returns the arc tangent of arg as a numeric value between -Pi/2 and Pi/2 radians.

9. What will be the output of the following PHP code?

2.        define("GREETING","Hello you! How are you today?");

3.        echo constant("GREETING");

4.    ?>

a) Hello you! How are you today?
b) GREETING
c) GREETING, Hello you! How are you today?
d) “GREETING”,”Hello you! How are you today?”
View Answer

Answer: a
Explanation: The define() function defines a constant.

10. What will be the output of the following PHP code?

2.         define("GREETING1","Hello you! How are you today?");

3.         define("GREETING2","Hello you! How are you today?");

4.         define("GREETING3","Hello you! How are you today?");

5.         echo defined("GREETING");

6.      ?>

a) 1
b) 0
c) 3
d) 4
View Answer

Answer: b
Explanation: The defined() function checks whether a constant exists.

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