Top 10 PHP Interview Questions and Answers

1-What is the difference between "echo" and "print" statements in PHP?

Answer: Both "echo" and "print" statements in PHP are used to output text. However, "echo" is a language construct, while "print" is a function. Additionally, "echo" can output multiple expressions at once, while "print" can only output one expression at a time.

2-What is the difference between "GET" and "POST" methods in PHP?

Answer: "GET" and "POST" are HTTP methods used to transfer data between the client and the server. "GET" sends data in the URL, while "POST" sends data in the HTTP request body. "GET" is used for retrieving data, while "POST" is used for submitting data, such as in a form.

3-What is the difference between "include" and "require" statements in PHP?

Answer: Both "include" and "require" statements in PHP are used to include files in a PHP script. However, "require" is used when the included file is essential to the script's execution, while "include" is used when the included file is not essential. Additionally, if the included file is not found, "require" will cause a fatal error, while "include" will only cause a warning.

4-What is the difference between "array_push" and "[]=" in PHP?

Answer: Both "array_push" and "[]=" are used to add elements to an array in PHP. However, "array_push" is a function, while "[]=" is a shorthand notation for adding elements to an array. Additionally, "array_push" can add multiple elements at once, while "[]=" can only add one element at a time.

5-What is the difference between "strpos" and "stripos" functions in PHP?

Answer: Both "strpos" and "stripos" functions in PHP are used to find the position of a substring in a string. However, "strpos" is case-sensitive, while "stripos" is case-insensitive.

6-How do you connect to a MySQL database in PHP?

Answer: To connect to a MySQL database in PHP, you can use the "mysqli_connect" function, which takes four parameters: the host name, username, password, and database name. For example: $conn = mysqli_connect("localhost", "username", "password", "database_name");

7-What is object-oriented programming in PHP?

Answer: Object-oriented programming (OOP) is a programming paradigm in PHP that focuses on creating objects that contain both data and methods. OOP in PHP allows for code reuse, better organization, and easier maintenance.

8-What is a session in PHP and how is it used?

Answer: A session in PHP is a way to store data across multiple page requests. When a session is started, a unique session ID is created and sent to the client in a cookie or in the URL. The session ID is then used to retrieve session data on subsequent page requests.

9-How do you prevent SQL injection in PHP?

Answer: SQL injection is a security vulnerability that allows attackers to execute malicious SQL statements through a web application. To prevent SQL injection in PHP, you can use prepared statements or parameterized queries, which separate the SQL code from user input.

10-How do you handle errors and exceptions in PHP?

Answer: To handle errors and exceptions in PHP, you can use the "try" and "catch" statements. The "try" statement contains the code that may throw an exception, while the "catch" statement contains the code that will handle the exception if it is thrown. Additionally, you can use the "error_reporting" function to set the level of error reporting in