PHP Questions and Answers – Functions – Part 2
This collection of PHP Multiple Choice Questions and Answers (MCQs): Quizzes & Practice Tests with Answer focuses on “PHP Functions”.
1. Which the following declaration are valid function names?
A .function()
B function()
C $function()
D €()
D
A valid function’s name can begin with a letter or underscore, followed-by any number of underscores, letters, or numbers. Based on the specified regular expression ([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*), a function’s name like this one is correct.
2. Which PHP functions that begins with double underscore __________.
A Inbuilt Function
B Magic Function
C Default Function
D User Defined Function
B
PHP functions that begin with a double underscore are called magic functions in PHP.
3. What is the result of the following PHP code?
<?php
function a()
{
function b()
{
echo 'B';
}
echo 'A';
}
b();
a();
?>
A BA
B AB
C BBA
D Error
D
Output:
Fatal error: Uncaught Error: Call to undefined function b() in [...][...]:12
Stack trace:
#0 {main}
thrown in [...][...] on line 12
4. Which the following are the mathematical functions in PHP?
A pow
B exp
C log
D log5()
A, B, C
PHP offers many predefined math functions that can be used to achieve mathematical operations.
5. Writing 2**4; will return the following result in PHP
A 2
B 4
C 8
D 16
D
The operator ** means exponentiation. 2 ** 4, Result of raising 2 to the 4’th power
6. What is the result of the following PHP code?
<?php
$foo = "ipsum";
function fun($bar)
{
echo $bar;
echo $foo;
}
fun("lorem");
?>
A loremipsum
B lorem
C ipsum
D Error
B
If you want to place some variables in function that was not passed by it, you should use “global”. Inside the function type
global $foo.
7. What is the result of the following PHP code?
<?php
function show($msg)
{
echo "$msg";
}
$display = "show";
$display("Welcome To StackHowTo!");
?>
A $msg
B show
C Welcome To StackHowTo!
D Error
C
You can call a function using a variable which stores the function’s name.
8. What is the result of the following PHP code?
<?php
function prod($n1, $n2, $n3)
{
$res = $n1 * $n2 * $n3;
echo "The product is $res";
}
prod(1, 2, 3, 4);
?>
A The product is 24
B The product is 12
C The product is 6
D Error
C
The function accepts just three arguments, so it will not consider the last argument.
9. Which function in PHP allow you to convert a string to an array?
A explode()
B to_array()
C implode()
D expand()
A
explode() function allow you to convert a string to an array.
10. What is the result of the following PHP code?
<?php
$str = "HELLO";
$str = lcfirst($str);
echo $str;
?>
A HELLO
B hello
C Hello
D hELLO
D
lcfirst() function allow you to convert the first character of a string to lowercase.
- PHP MCQ – Multiple Choice Questions and Answers – Basics – Part 1
- PHP MCQ – Multiple Choice Questions and Answers – Basics – Part 2
- PHP MCQ – Multiple Choice Questions and Answers – Basics – Part 3
- PHP Questions and Answers – Functions – Part 1
- PHP Questions and Answers – Functions – Part 2
- PHP Questions and Answers – Arrays – Part 1
- PHP Questions and Answers – Arrays – Part 2
- PHP Questions and Answers – Arrays – Part 3
- PHP Questions and Answers – Arrays – Part 4
- PHP Questions and Answers – Object-Oriented OOP – Part 1
- PHP Questions and Answers – Object-Oriented OOP – Part 2
- PHP Questions and Answers – Object-Oriented OOP – Part 3
- PHP Questions and Answers – String – Part 1
- PHP Questions and Answers – String – Part 2
- PHP Questions and Answers – Regular Expressions
- PHP Questions and Answers – Exception Handling
