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

20 min

Your company is analyzing malware which targets numerical record files.

The malware uses a sliding window over the array of numbers in a file, and tries to match the following pattern:

Tl, -, -, X, -, -, -, Tr

The entire window is moved so that 'X' passes through all the values and is compared to the numbers at the 'Tl' and 'Tr' locations, which are positioned at a constant offset to 'X'.

The malware has the following rules:

  • If the value at the 'Tl' or 'Tr' position of the pattern is bigger or equal to the value at the 'X’ position, the malware replaces the value at 'X' with 0.
  • If the value at the 'Tl' or 'Tr' offset is out of bounds, then the value at 'X' is only compared to the other existing value.
  • The record is processed in two stages: first, all the positions that should be set to 0 are located, using the original values for comparison. Only after all positions have been identified do they get set to 0.

For example, if the values in a record file are the following:

[1, 2, 0, 5, 0, 2, 4, 3, 3, 3]

The expected values after the malware runs are:

[1, 0, 0, 5, 0, 0, 0, 3, 3, 0]

In this example, both '2's, the '4' and the last '3' were replaced by 0.

Implement the simulate function so that the malware behavior is replicated for further study.

30 min
2D Array

A turn-based strategy game has a grid with water and land. The grid contains a true value where it's water and false where it's land.

The player controls a boat unit with a particular movement pattern. It can only move to fixed destinations from its current position as shown in the image below:

movement pattern

The boat can only move in a direct path through water to the possible destinations, so a destination will become unreachable if there is land in the way. 

Implement the canTravelTo function, that checks whether a destination is reachable by the boat. It should return true for destinations that are reachable according to the pattern above, and false for unreachable or out of bounds destinations which are outside the grid. 

For example, consider the following code:

$gameMatrix = [
    [false, true,  true,  false, false, false],
    [true,  true,  true,  false, false, false],
    [true,  true,  true,  true,  true,  true],
    [false, true,  true,  false, true,  true],
    [false, true,  true,  true,  false, true],
    [false, false, false, false, false, false],

echo canTravelTo($gameMatrix, 3, 2, 2, 2) ? "true\n" : "false\n"; // true, Valid move
echo canTravelTo($gameMatrix, 3, 2, 3, 4) ? "true\n" : "false\n"; // false, Can't travel through land
echo canTravelTo($gameMatrix, 3, 2, 6, 2) ? "true\n" : "false\n"; // false, Out of bounds

The following image shows valid and invalid destinations when the boat is in the position (3, 2):

terrain movement

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42 more premium PHP questions

Array Search, Read First Line, Last Key, Height, Category Tree, Hobbies, Username, View Count, Log Parser, Kilometer Converter, String Occurrence, Segment, Cookie, Read Write Execute, Fire Dragon, Unique Numbers, Chain Link, Special Actions, Language Teacher, Crop Ratio, Vectors, Date Transform, Construction Game, Numbers To Text, Airport Networks, Company Stock, Shipping, Flower Shop, Array Sum, Shipping Service, PC Parts Seller, Action Stack, Flimsy Ladder, Paragraph, Filter, Greeter, Planet Search, Digital Flasks, Calories Burned, Circuit Simulator, Students, Chemical Machine.

Skills and topics tested

  • PHP
  • Arrays
  • Recursion
  • Exceptions
  • Arithmetic
  • Language
  • Associative Arrays
  • Iteration
  • Regex
  • Strings
  • JSON
  • Serialization
  • XML
  • Inheritance
  • Method Overriding
  • OOP
  • Stream
  • Session
  • Interfaces
  • Algorithmic Thinking
  • Linked List
  • Bug Fixing
  • Integer Division
  • 2D Array
  • Graphs
  • AI Code Review
  • Conditional Statements
  • Loops
  • Null Coalescing Operator
  • Pass by Reference
  • Callback
  • Classes
  • Properties
  • Stack
  • Conditions
  • Sorting

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.

Jan Opperman, Grindrod Bank

Product reviews

G2 - Crowd Badge
G2 - High Performer (2022)
Capterra - 4.5 Stars
Capterra - Shortlist (2023)

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