Functions(Php ) Questions and answers for exam Preparation

Question 1. Which one of the following is the right way of defining a function in PHP?

function { function body }
data type functionName(parameters) { function body }
functionName(parameters) { function body }
function fumctionName(parameters) { function body }

Explanation:-

Answer: Option D. -> function fumctionName(parameters) { function body }

Question 2. What will happen in this function call?

Call By Value
Call By Reference
Default Argument Value
Type Hinting

Explanation:-

Answer: Option A. -> Call By Value
When you pass an argument in the above manner or say we pass 15 and 3 directly, it is called passing by value or call by value.

Question 3. Type Hinting was introduced in which version of PHP?

PHP 4
PHP 5
PHP 5.3
PHP 6

Explanation:-

Answer: Option B. -> PHP 5
Type hinting gives you the ability to force parameters to be objects of certain class or to be arrays. PHP 5 introduced this feature.

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

Error
0
42
84

Explanation:-

Answer: Option C. -> 42
You can designate certain arguments as optional by placing them at the end of the list and assigning them a default value of nothing.

Question 5. Which of the following are valid function names?
1. function()
2. €()
3. .function()
4. $function()

Only 2
None of the mentioned
All of the mentioned
3 and 4

Explanation:-

Answer: Option A. -> Only 2
Except a) others are invalid names. According to the specified regular expression ([a-zA-Z_x7f-xff][a-zA-Z0-9_x7f-xff]*), a function name like this one is valid.

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

o world!
Hello world!
111
No Output

Explanation:-

Answer: Option A. -> o world!
111 is the ASCII value of o.

Question 7. Phpinfo() will display about?
1. OS version information
2. PHP installation
3. Variables
4. HTTP headers

Explanation:-

Answer: Option E. -> All the Above

Question 8. . . . . . converts the keys of an array into values and the values into keys.

array_flips()
array_transpose()
array_trans()
array_flip()

Explanation:-

Answer: Option D. -> array_flip()

Question 9. Above usleep() function pauses PHP for .
usleep(1000000);

1 second
1 microseconds
10 seconds
100 microseconds

Explanation:-

Answer: Option A. -> 1 second

Question 10. Output will be:
$array = array(0, 1, 2);
$array = array_pad($array, -6, ‘NEW’);

Array ( [1] => NEW [2] => NEW [3] => NEW [4] => 0 [5] => 1 [6] => 2 )
Array ( [-1] => NEW [-2] => NEW [-3] => NEW [-4] => 0 [-5] => 1 [-6] => 2 )
Array ( [0] => NEW [-1] => NEW [-2] => NEW [-3] => 0 [-4] => 1 [-5] => 2 )
Array ( [0] => NEW [1] => NEW [2] => NEW [3] => 0 [4] => 1 [5] => 2 )

Explanation:-

Answer: Option D. -> Array ( [0] => NEW [1] => NEW [2] => NEW [3] => 0 [4] => 1 [5] => 2 )