Php Coding Interview Questions
Commonly Asked Php Coding Interview Questions
PHP coding interview questions are designed to assess a candidate's understanding and knowledge of the PHP programming language and their problem-solving skills. These questions typically cover topics such as syntax, variables, functions, data types, control structures, database connectivity, error handling, and security. They can range from basic to advanced and require candidates to think critically and demonstrate their coding abilities. Preparing for these questions can help candidates showcase their skills and stand out in the competitive job market.
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1 - What is the difference between single quotes and double quotes in PHP?
Single quotes will print the exact string as written, while double quotes allow for the use of escape sequences and variable interpolation.
2) What is the difference between == and === in PHP?
The double equals operator (==) compares the values of two operands, while the triple equals operator (===) also compares the data types of the operands.
3) How do you declare a variable in PHP?
Variables are declared using the $ symbol, followed by the variable name and an equal sign. For example, $name = “John”;
4) What is the use of the global keyword in PHP?
The global keyword allows a variable to be accessed from outside its current scope. This is useful when needing to access a variable within a function that was defined outside of the function.
5) What is a superglobal variable in PHP?
Superglobal variables are predefined variables that are always accessible, regardless of scope. Examples include $_GET, $_POST, and $_SERVER.
6) What is the difference between include() and require() in PHP?
Both include() and require() are used to load external PHP files, but require() will cause a fatal error and stop the script if the file cannot be found, while include() will only cause a warning and continue the execution.
7) What is the difference between GET and POST methods in form submission?
GET method submits data in the URL, while POST method sends data in the HTTP request body. GET should be used for non sensitive data, while POST is better for sensitive data as it is not visible in the URL.
8) How do you display errors in PHP?
Errors can be displayed by changing the error_reporting and display_errors settings in the php.ini file, or by using the error_reporting(E_ALL) and ini_set('display_errors', 1) functions in the code.
9) What is the difference between unset() and empty() in PHP?
Unset() removes the given variable, while empty() checks if a variable is set and if its value is considered empty (e.g. null, 0, “”, false).
10) What is a class in PHP?
A class is a blueprint for creating objects in PHP. It contains properties (variables) and methods (functions) that define the behavior and characteristics of the objects.
11) What is the difference between public, protected, and private access modifiers in PHP?
Public allows the property or method to be accessed from anywhere, protected allows access within the class and subclasses, and private restricts access to only within the class.
12) What is the difference between a normal function and a static function in PHP?
A normal function can only be called on an object, while a static function can be called without creating an instance of the class.
13) How do you handle file uploads in PHP?
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The $_FILES superglobal variable is used to access information about a file that has been uploaded. File uploads need to be enabled in the php.ini file and the enctype attribute needs to be set to “multipart/form data” in the HTML form.
14) What is a session in PHP?
Sessions are a way to store and access user data across multiple pages within a website. A session creates a unique identifier for each user and stores their data on the server, allowing the data to be accessed on different pages.
15) What is the difference between unset() and destroy() for a session in PHP?
Unset() removes a specific session variable, while destroy() ends the current session and deletes all session data associated with the current session ID.
16) How do you validate user input in PHP?
User input can be validated using functions such as filter_var() and preg_match(), as well as by using regular expressions.
17) What are the different types of PHP operators?
PHP supports arithmetic, assignment, comparison, logical, string, and array operators.
18) How is error handling done in PHP?
Error handling in PHP can be done using the try catch block, the set_error_handler() function, and the exception class.
19) How do you connect to a database in PHP?
The mysqli_connect() or PDO constructor function is used to create a connection to a database in PHP.
20) What is a cookie in PHP?
A cookie is a small piece of data that is stored on the user's computer by the web browser. It is used to store information about the user and can be accessed on different pages of a website.
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