Explain the difference between echo() and print() statement? When might you use one over the other?
PHP Easy Interview Questions
Questions to ask a PHP Developer
PHP engineers are often required to have a knowledge of the full web stack: starting with the ability to write optimized SQL queries, and wrapping up with a good understanding of HTML/CSS. When interviewing a PHP developer, make sure that you think through your requirements and ask good questions for all of them.
Here's a suggestion for a good menu of PHP interview questions:
- Start off with some basic SQL such as SQL Skills: Joins, Averages and Sums
- Include at least one simple coding task such as Separate a list of integers or Find the missing number
- Explore their ability to come up with an overall system design and data model with a flexible question like Design a restaurant reservation system or Design a card game system
- Ensure that they have a solid understanding of the basic building blocks of the web by asking about HTTP GET and POST or What are HTTP cookies?
- Wrap up with some CSS questions like Explore the HTML display and position attributes or CSS rule-set basics
Print out the prime numbers between 1 and 100. As a first pass, don't worry about writing an efficient algorithm. Just write clear code that is easy to follow. Once you've done that, consider different possible optimizations.
Use Newton's method to approximate the square root of a method. Newton's method is to approximate z = Sqrt(x) by picking a starting point z and then repeating:
z = z - (z*z - x)/(2*z)
Pick a sensible point to stop the iteration.
Most languages have a built in sort method that will sort an array of strings alphabetically. Demonstrate how to sort an array of strings by the length of each string, shortest strings first.
What is a design pattern and why are they useful in software development?
Write a string to find a substring in a given string. Do this in O(n) or better
Write an iterative function to reverse a string. Do the same thing as a recursive function.
Write a program to print out a multiplication table, from 1x1 to 12x12. This should look like:
1 2 3 4 5 6 7 8 9 10 11 12 2 4 6 8 10 12 14 16 18 20 22 24 3 6 9 12 15 18 21 24 27 30 33 36 4 8 12 16 20 24 28 32 36 40 44 48 5 10 15 20 25 30 35 40 45 50 55 60 6 12 18 24 30 36 42 48 54 60 66 72 7 14 21 28 35 42 49 56 63 70 77 84 8 16 24 32 40 48 56 64 72 80 88 96 9 18 27 36 45 54 63 72 81 90 99 108 10 20 30 40 50 60 70 80 90 100 110 120 11 22 33 44 55 66 77 88 99 110 121 132 12 24 36 48 60 72 84 96 108 120 132 144
What is a hashtable? Give an example of a type of problem that a hashtable is useful for.
For the data structures: Array and Linked List explain:
- Where you might use them
- Operations that are commonly supported (add, insert etc)
What's the value of hexadecimal FF in decimal?
Write a program to find the largest integer in an array of integers.
Write a function that sums up integers from a text file that looks like the following:
1 3 27 2 2123
Write function to print the odd numbers from 1 to 99
How many ways can an argument be passed to a method. Explain each method.
Explain the difference between method overloading and method overriding
Write a program to open a file for reading and print out its entire contents
Write a function to take the following list and return one list of odd numbers and one list of even numbers:
ints = [1,21,53,84,50,66,7,38,9]
What is load balancing? Describe three different types of load balancing techniques? What problems can load balancing solve? What problems can it introduce?
A user types the following URL into their browser:
Explain in detail how this would cause a page to appear in their browser, with images, interactive elements (Ajax), styled paragraphs of text etc.
Explain what a deadlock is in multithreaded programming
Write a function that takes an integer and returns the smallest number that is greater than the given number which is a palendrome.
For example, if the input was
111 the next palindromic number would be
Write a function,
tokenize_string(input_string, delimiter_list) that returns a list of strings that are separated by the delimiters.
tokenize_string("How now, Mrs. Brown Cow") returns
['How', 'now', 'Mrs', 'Brown', 'Cow']
Explain the terms "coupling" and "Cohesion". Is low coupling and high cohesion desirable? Why?
Model the animal kingdom as a set of classes. Discuss the species, their behavior and properties.
Explain the principles of test drive development.
Explain the difference between require_once(), require() and include() and when you might use these
Describe the singleton design pattern and how you might use it in practice.
Describe the MVC design pattern and how you might use it in practice.
Describe the Factory design pattern and how you might use it in practice.
Write a function to return the Nth number of Fibonacci sequence.
Design the schema or the classes to implement a library for building card games with. This library should make it easy to build games like Rummy, Poker, Hearts, Whist etc.
Outline the implementation for two of the most important methods of the