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144 interview questions on PHPfor developers (2025)

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

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144 questions
Easy
34 votes1994 runs1 comment

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

Back-end developer
functions
errors
Vincent Cotroat Mar 24, 2023
Hard
11 votes2636 runs0 comment

Which of the following statements are true ?

Back-end developer
functions
variables
Anonymous authorat Mar 28, 2022
Hard
9 votes2678 runs
3 comments

What type of array is the following?

Back-end developer
arrays
multidimensional
bidimensional
Anonymous authorat Mar 28, 2022
Medium
9 votes2589 runs
6 comments

Which of the following statements are true ?

Back-end developer
php
arrays
Anonymous authorat Mar 28, 2022
Medium
8 votes2716 runs0 comment

What is the value of the `PHP_FLOAT_MIN` variable?

Back-end developer
constants
float
Anonymous authorat Mar 28, 2022
Medium
7 votes2030 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
7 votes1358 runs
6 comments

PHP code that throws an error.

Back-end developer
php
errors
Anonymous authorat Jan 4, 2022
Medium
6 votes2607 runs0 comment

What are the risks when running the following code ?

Back-end developer
security
xss
Anonymous authorat Mar 28, 2022
Hard
6 votes2532 runs
1 comment

Usage of the global scope in a PHP function.

Back-end developer
functions
variables
Anonymous authorat Mar 28, 2022
Hard
6 votes2448 runs
1 comment

Usage of the spaceship operator in a PHP loop.

Back-end developer
comparison
operators
Anonymous authorat Mar 28, 2022
Medium
6 votes1857 runs0 comment

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

Back-end developer
arrays
functions
Nick LAM YEE MANat Mar 28, 2023
Easy
5 votes2291 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 votes1163 runs
1 comment

Check if a value is in an array in PHP

Back-end developer
arrays
strings
Anonymous authorat Jan 4, 2022
Easy
5 votes1156 runs0 comment

Which function signature is valid?

Back-end developer
functions
types
Clément Devos (W3D Team)at Jan 4, 2022
Medium
5 votes1150 runs2 comments

PHP function with named and positional arguments.

Back-end developer
php
arrays
functions
Anonymous authorat Aug 26, 2024
Medium
4 votes2345 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 votes2304 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 votes1752 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 votes1258 runs2 comments

Use the match expression in PHP to print a string.

Back-end developer
match
default
Anonymous authorat Jan 4, 2022
Medium
4 votes1241 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
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