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48 interview questions on PHP - Fundamentalsfor developers (2026)

Test your technical skills before an interview of PHP - Fundamentals with 48 corrected questions. Beginner, Intermediate or Expert level.

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48 questions
Easy
37 votes2145 runs1 comment

Explain the difference between the `include` and `require` functions in PHP.

Back-end developer
functions
errors
Vincent Cotroat Mar 24, 2023
Hard
12 votes2783 runs0 comment

Which of the following statements are true ?

Back-end developer
functions
variables
Anonymous authorat Mar 28, 2022
Hard
10 votes2816 runs
3 comments

What type of array is the following?

Back-end developer
arrays
multidimensional
bidimensional
Anonymous authorat Mar 28, 2022
Medium
9 votes2866 runs0 comment

What is the value of the `PHP_FLOAT_MIN` variable?

Back-end developer
constants
float
Anonymous authorat Mar 28, 2022
Medium
9 votes2733 runs
8 comments

Which of the following statements are true ?

Back-end developer
php
arrays
Anonymous authorat Mar 28, 2022
Medium
7 votes2738 runs0 comment

What are the risks when running the following code ?

Back-end developer
security
xss
Anonymous authorat Mar 28, 2022
Medium
7 votes2092 runs0 comment

Write a PHP class with a constant and a public method that outputs the constant.

Back-end developer
constants
classes
Anonymous authorat Mar 28, 2022
Hard
6 votes2662 runs
1 comment

Usage of the global scope in a PHP function.

Back-end developer
functions
variables
Anonymous authorat Mar 28, 2022
Hard
6 votes2571 runs
1 comment

Usage of the spaceship operator in a PHP loop.

Back-end developer
comparison
operators
Anonymous authorat Mar 28, 2022
Medium
6 votes1977 runs0 comment

What is the `asort()` function for in PHP ?

Back-end developer
arrays
functions
Nick LAM YEE MANat Mar 28, 2023
Easy
5 votes2401 runs0 comment

Using the ternary operator to choose between two strings in PHP.

Back-end developer
ternary operator
strings
Anonymous authorat Mar 28, 2022
Medium
4 votes2461 runs0 comment

Use array_map to get the length of each string in an array in PHP

Back-end developer
arrays
functions
Anonymous authorat Mar 28, 2022
Medium
4 votes2420 runs0 comment

Write a PHP function that adds two numbers and returns an integer.

Back-end developer
functions
types
Anonymous authorat Mar 28, 2022
Medium
4 votes1791 runs0 comment

How to count the number of occurences of a pattern in a string in PHP

Back-end developer
functions
regular expressions
Anonymous authorat Mar 28, 2022
Medium
4 votes1059 runs2 comments

Usage of the null coalescing operator in PHP

Back-end developer
ternary operator
null coalescing operator
Anonymous authorat Mar 28, 2022
Hard
3 votes2560 runs0 comment

What is the `is_long()` function for ?

Back-end developer
functions
integers
Anonymous authorat Mar 28, 2022
Hard
3 votes1479 runs0 comment

What is the difference between $_GET and $_POST in PHP?

Back-end developer
arrays
php
Anonymous authorat Mar 28, 2022
Hard
3 votes359 runs0 comment

Which answer(s) can determine if `$a` is of type `MyPHPClass` or not ?

Back-end developer
William Meadat Feb 29, 2024
Easy
2 votes2376 runs1 comment

What is the `define()` function for in PHP?

Back-end developer
constants
functions
Anonymous authorat Mar 28, 2022
Easy
2 votes1593 runs0 comment

Pass by reference in PHP

Back-end developer
functions
references
Anonymous authorat Mar 28, 2022