PHP Online Test

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About the test

The PHP online test assesses knowledge of programming in the PHP language through a series of live coding questions.

The assessment includes work-sample tasks such as:

  • Serializing to/from JSON to handle web requests.
  • Using OOP principles in PHP.
  • Working with associative arrays and using common built-in functions.

A good PHP developer needs a solid understanding of the PHP programming language and its specifics, OOP principles, and the ability to take advantage of its rich set of built-in functions.

Sample public questions

Hard
10 min
code
Public
PHP
Closures
Higher Order Function

As part of a data processing pipeline, complete the implementation of the make_pipeline method:

  • The make_pipeline method should accept a variable number of functions, and it should return a new function that accepts one parameter $arg.
  • The returned function should call the first function in make_pipeline with the parameter $arg, and call the second function with the result of the first function.
  • The returned function should continue calling each function in make_pipeline in order, following the same pattern, and return the value from the last function.

For example, calling make_pipeline(function($x) { return $x * 3; }, function($x) { return $x + 1; }, function($x) { return $x / 2; }), and then calling the returned function with 3 should return 5.

Easy
10 min
code
Public
PHP
Arithmetic

Implement the function findRoots to find the roots of the quadratic equation: ax2 + bx + c = 0. The function should return an array containing both roots in any order. If the equation has only one solution, the function should return that solution as both elements of the array. The equation will always have at least one solution.

The roots of the quadratic equation can be found with the following formula: A quadratic equation.

For example, findRoots(2, 10, 8) should return [-1, -4] or [-4, -1] as the roots of the equation 2x2 + 10x + 8 = 0 are -1 and -4.

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33 more premium PHP questions

Array Search, Read First Line, Shipping Service, Flower Shop, Greeter, Last Key, Height, Shipping, Array Sum, Category Tree, Hobbies, Products, Username, View Count, Log Parser, Kilometer Converter, Paragraph, String Occurrence, Segment, Cookie, Read Write Execute, Filter, Fire Dragon, Unique Numbers, Action Stack, PC Parts Seller, Date Transform, Chain Link, Numbers To Text, Vectors, Special Actions, Language Teacher, Crop Ratio.

Skills and topics tested

  • PHP
  • Arrays
  • Recursion
  • Exceptions
  • Callback
  • Null Coalescing Operator
  • Language
  • Arithmetic
  • Pass by Reference
  • Associative Arrays
  • Iteration
  • JSON
  • Serialization
  • Sorting
  • Regex
  • Strings
  • XML
  • Inheritance
  • Method Overriding
  • OOP
  • Stream
  • Session
  • Interfaces
  • Algorithmic Thinking
  • Stack
  • Classes
  • Properties
  • Linked List
  • Bug Fixing
  • Integer Division

For job roles

  • PHP Developer
  • Web Developer

Sample candidate report

What others say

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Simple, straight-forward technical testing

TestDome is simple, provides a reasonable (though not extensive) battery of tests to choose from, and doesn't take the candidate an inordinate amount of time. It also simulates working pressure with the time limits.

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