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40 interview questions on PHP8for developers (2025)

Test your technical skills before an interview of PHP8 with 40 corrected questions. Beginner, Intermediate or Expert level.

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7
40 questions
Hard
7 votes1259 runs
6 comments

PHP code that throws an error.

Back-end developer
php
errors
Anonymous authorat Jan 4, 2022
Medium
5 votes1064 runs2 comments

PHP function with named and positional arguments.

Back-end developer
php
arrays
functions
Anonymous authorat Aug 26, 2024
Medium
4 votes1155 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
Easy
4 votes1058 runs0 comment

Attributes are metadata that can be added to classes, properties, constants or methods.

Back-end developer
attributes
metadata
Anonymous authorat Jan 4, 2022
Hard
3 votes1214 runs
5 comments

PHP code that throws a TypeError

Back-end developer
null
type-hinting
Anonymous authorat Mar 14, 2023
Medium
3 votes1167 runs2 comments

Use the match expression in PHP to print a string.

Back-end developer
match
default
Anonymous authorat Jan 4, 2022
Medium
3 votes1081 runs
1 comment

Check if a value is in an array in PHP

Back-end developer
arrays
strings
Anonymous authorat Jan 4, 2022
Easy
3 votes1077 runs0 comment

Which function signature is valid?

Back-end developer
functions
types
Clément Devos (W3D Team)at Jan 4, 2022
Easy
3 votes1026 runs0 comment

Write a PHP script that displays the sum of two numbers.

Back-end developer
variables
strings
Anonymous authorat Jan 4, 2022
Hard
3 votes888 runs
3 comments

Write to a nullsafe property in PHP

Back-end developer
nullsafe operator
php
Anonymous authorat Oct 6, 2023
Medium
3 votes193 runs0 comment

Is the following code possible in PHP 8? ```php $name = ‘my_argument_name’; $value = 25; myFunction($name: $value); ```

Back-end developer
functions
arguments
Damienat Sep 5, 2023
Easy
2 votes1153 runs0 comment

Create a class Foo with a public property amount and a constructor that takes a Currency object and an integer.

Back-end developer
constructor
parameters
Anonymous authorat Jan 4, 2022
Medium
2 votes1048 runs2 comments

Is this PHP code valid?

Back-end developer
constructor
parameters
Anonymous authorat Jan 4, 2022
Easy
2 votes1035 runs0 comment

Is this class valid? ```php <?php abstract class Test{ abstract public function __construct(private $x); } ```

Back-end developer
constructor
private
Anonymous authorat Jan 4, 2022
Easy
2 votes1022 runs1 comment

What are WeakMap data structures?

Back-end developer
arrays
objects
Anonymous authorat Feb 6, 2024
Easy
2 votes1019 runs0 comment

What are the new string processing functions introduced in PHP8?

Back-end developer
functions
string
Anonymous authorat Jan 4, 2022
Medium
2 votes141 runs1 comment

How to use the `__construct()` method in PHP.

Back-end developer
constructor
errors
Amine Bouchamat Sep 5, 2022
Easy
1 vote1023 runs0 comment

Implement the abstract method of the Trait in the class.

Back-end developer
traits
abstract
Anonymous authorat Jan 4, 2022
Medium
1 vote951 runs1 comment

Display the name of the user associated with an article in PHP

Back-end developer
null
optional
Anonymous authorat Jan 4, 2022
Easy
1 vote680 runs0 comment

Print the class name of a PHP object

Back-end developer
classes
objects
Anonymous authorat Jan 4, 2022