PHP Questions and Answers – Functions – Part 1
This collection of PHP Multiple Choice Questions and Answers (MCQs): Quizzes & Practice Tests with Answer focuses on “PHP Functions”.
1. Why should we use functions?
A Easily maintained
B Reusability
C Easier error detection
D All of the above
D
Functions provide reusability of code, easier to detect error, and easier to maintain.
2. How many categories of functions are there in PHP?
A 1
B 2
C 3
D 4
B
PHP allows us using two major categories of functions: Built-in functions and User Defined Functions.
3. Which function is not a built-in function in PHP ?
A fopen()
B print()
C addNumber()
D gettype()
C
addNumber() is not a built-in function in PHP.
4. How to define a function in PHP?
A function {function body}
B datatype functionName(parameters) {function body}
C functionName(parameters) {function body}
D function functionName(parameters) {function body}
D
PHP provids us a way to create a user-defined functions. Any name ending with an open and closed parenthesis () is a function. The keyword function is always used to start a function.
5. Type Hinting was provided in which version of PHP?
A PHP 4
B PHP 5
C PHP 5.3
D PHP 6
B
With type hinting, we can specify the expected data type of an argument in a function declaration and as well as the return type.
6. A function always starts with the keyword _______
A def
B function
C fun
D None of the above
B
A function always starts with the keyword function.
7. A function’s name cannot begin with a _______.
A number
B underscore
C alphabet
D Both A and B
A
A function name cannot begin with a number. It can start with underscore or an alphabet.
8. A function name is not case-sensitive?
A False
B True
C Only user-defined function is case-sensitive
D None of the above
B
A function’s name is not case-sensitive.
9. What is the result of the following PHP code?
<?php
function calculate($cost, $tax="")
{
$total = $cost + ($cost * $tax);
echo "$total";
}
calculate(5);
?>
A 0
B 5
C 25
D Error
B
You can specify some arguments as optional by puting them at the end of the list and assigning them a default value of nothing.
10. What is the type of function call used in line 10 in the following code?
<?php
function add($n1, $n2)
{
$sum = $n1 + $n2;
}
$n1 = 2;
$n2 = 4;
add($n1, $n2);
?>
A Call By Reference
B Call By Value
C Call By Address
D Default Argument Value
B
If we call a function by value, we actually transfer the values of the arguments which are kept or copied into the formal parameters of the function. As a result, the original values are untouched only the parameters inside the function changes.
- 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
