Programming

PHP Interview Prep - Programming

This PHP Interview Prep test evaluates your master the core PHP concepts and common interview questions every developer should know.

Duration

Complete at your own pace or within the time limit

Questions

Multiple choice with one correct answer

Accuracy

Expert-reviewed questions with clear answer keys

Results

Instant detailed breakdown by topic area

PHP Interview Prep
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About This Test

This test prepares you for PHP developer interview questions on essential topics.

The test covers fundamental PHP interview topics that employers consistently ask about. You'll encounter questions on PHP basics, syntax, and core language features that demonstrate professional-level understanding.

Questions are structured like real interview scenarios with focus on explaining concepts clearly. You'll answer multiple-choice questions that test both knowledge and reasoning about PHP fundamentals.

Review your results to strengthen answers on commonly asked interview topics. Use this feedback to build confidence discussing PHP essentials with potential employers.

PHP Interview Topics You Will Face

Comparison and Type Juggling

Expect questions on double versus triple equals, type coercion pitfalls, and predicting the result of loose comparisons.

Arrays and Their Functions

Interviewers probe associative arrays, reference versus copy behavior, and the common array functions like map, filter, and reduce.

Object-Oriented Concepts

Be ready to explain interfaces, abstract classes, traits, visibility, and late static binding.

Security Fundamentals

Questions cover SQL injection, cross-site scripting, prepared statements, and safe handling of request input.

Sample Questions

A few real questions from this test, with answers and explanations. Take the full test above for the complete set.

When should you use === instead of == in PHP?

Answer: When you want to compare both value and type without type juggling

=== is the identity operator: it returns true only when operands share the same type and value, avoiding surprising coercions such as 0 == "" that == can produce.

What is the difference between isset($x) and empty($x) when $x equals 0?

Answer: isset returns true (the variable exists), empty returns true (0 is falsy)

isset checks that a variable is declared and not null, so it is true for 0. empty tests for a falsy value, and 0 is falsy, so empty is also true here.

How does is_null($x) differ from isset($x)?

Answer: is_null returns true only when the value is null, while isset returns false for null or undefined variables

is_null tests whether a defined value is null, whereas isset returns false both when a variable is unset and when it is null. isset never emits a warning for missing variables.

What does passing a parameter by reference with & allow a function to do?

Answer: Modify the caller's original variable rather than a copy

A reference parameter like function inc(&$n) binds to the caller's variable, so changes inside the function persist outside it. Without &, scalars are passed by value.

What is the key difference between self:: and static:: inside a class method?

Answer: self:: resolves to the class where the method is defined, static:: resolves to the runtime called class (late static binding)

self:: is bound at definition time to the declaring class, while static:: uses late static binding to reference the class that was actually called, which matters with inheritance.

Frequently Asked Questions

Find answers to common questions about this assessment

By default arrays are passed by value, so a function receives a copy and modifying it does not affect the caller unless you pass it by reference with an ampersand. This copy-on-write behavior is efficient because PHP only actually copies when the array is modified.

Double equals applies type juggling before comparing, producing surprising results such as certain strings equaling zero. Triple equals compares value and type without conversion, so results are predictable. Interviewers often test this because loose comparison bugs are a classic source of PHP defects.

Prepared statements separate the SQL structure from the data by sending placeholders first and binding values afterward. Because the database treats bound values purely as data, injected SQL in user input cannot change the query, which is why parameter binding is the standard defense.

An abstract class can provide implemented methods and state and is inherited by one subclass, while an interface only declares method signatures a class must implement and a class can implement many. Use interfaces for contracts and abstract classes to share partial implementation.

Scores are based on the number of correct answers divided by total questions, with a breakdown by topic category.

Yes, questions are randomly selected and ordered from our question bank to ensure each attempt is unique.

No account is required. You can take the test immediately. Optionally provide an email to save your results.

There is no pass/fail threshold. The test measures your knowledge level and provides detailed feedback for improvement.

For knowledge tests, we recommend answering without external help to get an accurate assessment. Practice exercises are designed for learning, so references are acceptable.

Our questions are written for structured educational practice and can give a useful snapshot of your current knowledge in the tested topics.

Learn how our tests are designed, scored, and validated.

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