144 interview questions on PHP for developers (2026)

Easy

39 votes2167 runs1 comment

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

Back-end developer

functions

errors

Vincent Cotroat Mar 24, 2023

Hard

13 votes2805 runs0 comment

Which of the following statements are true ?

Back-end developer

functions

variables

Anonymous authorat Mar 28, 2022

Medium

10 votes2891 runs0 comment

What is the value of the `PHP_FLOAT_MIN` variable?

Back-end developer

constants

float

Anonymous authorat Mar 28, 2022

Hard

10 votes2838 runs

3 comments

What type of array is the following?

Back-end developer

arrays

multidimensional

bidimensional

Anonymous authorat Mar 28, 2022

Medium

9 votes2754 runs

8 comments

Which of the following statements are true ?

Back-end developer

php

arrays

Anonymous authorat Mar 28, 2022

Hard

9 votes1434 runs

6 comments

PHP code that throws an error.

Back-end developer

php

errors

Anonymous authorat Jan 4, 2022

Medium

7 votes2758 runs0 comment

What are the risks when running the following code ?

Back-end developer

security

xss

Anonymous authorat Mar 28, 2022

Medium

7 votes2104 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 votes2683 runs

1 comment

Usage of the global scope in a PHP function.

Back-end developer

functions

variables

Anonymous authorat Mar 28, 2022

Hard

6 votes2591 runs

1 comment

Usage of the spaceship operator in a PHP loop.

Back-end developer

comparison

operators

Anonymous authorat Mar 28, 2022

Medium

6 votes1999 runs0 comment

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

Back-end developer

arrays

functions

Nick LAM YEE MANat Mar 28, 2023

Easy

5 votes2418 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

5 votes1229 runs

1 comment

Check if a value is in an array in PHP

Back-end developer

arrays

strings

Anonymous authorat Jan 4, 2022

Medium

5 votes1220 runs2 comments

PHP function with named and positional arguments.

Back-end developer

php

arrays

functions

Anonymous authorat Aug 26, 2024

Easy

5 votes1217 runs0 comment

Which function signature is valid?

Back-end developer

functions

types

Clément Devos (W3D Team)at Jan 4, 2022

Medium

4 votes2480 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 votes2440 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 votes1800 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 votes1322 runs2 comments

Use the match expression in PHP to print a string.

Back-end developer

match

default

Anonymous authorat Jan 4, 2022

Medium

4 votes1311 runs2 comments

Is this function signature valid? ```php <?php interface Demo { public function bar(): ?mixed; } ```

Back-end developer

functions

interfaces

Anonymous authorat Jan 4, 2022

144 interview questions on PHPfor developers (2026)

Test your technical skills before an interview of PHP with 144 corrected questions. Beginner, Intermediate or Expert level.

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

Which of the following statements are true ?

What is the value of the `PHP_FLOAT_MIN` variable?

What type of array is the following?

Which of the following statements are true ?

PHP code that throws an error.

What are the risks when running the following code ?

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

Usage of the global scope in a PHP function.

Usage of the spaceship operator in a PHP loop.

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

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

Check if a value is in an array in PHP

PHP function with named and positional arguments.

Which function signature is valid?

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

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

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

Use the match expression in PHP to print a string.

Is this function signature valid? ```php <?php interface Demo { public function bar(): ?mixed; } ```