Blogs

• What is PHP?

Answer: PHP is a server-side scripting language that is used to create dynamic web pages and applications.

• What is the difference between GET and POST methods in PHP?

Answer: The GET method sends data through the URL, while the POST method sends data through the HTTP request body. GET requests are typically used for retrieving data, while POST requests are used for submitting data.

• What is the difference between include and require in PHP?

Answer: The include statement includes a PHP file and continues to execute the script even if the file is not found. The require statement includes a PHP file and stops the script if the file is not found.

• What is the purpose of the function in PHP?

Answer: Functions in PHP are used to encapsulate code into a modular and reusable form.

• What is the difference between procedural and object-oriented programming in PHP?

Answer: Procedural programming is a linear approach to programming, while object-oriented programming focuses on the creation of objects that can contain both data and behavior.

• How do you connect to a MySQL database in PHP?

Answer: You can use the mysqli_connect() function to connect to a MySQL database in PHP.

Example code:

$con = mysqli_connect("localhost","username","password","database_name");

• What is the difference between mysqli and PDO in PHP?

Answer: Both mysqli and PDO are used for connecting to databases in PHP. mysqli is a specific extension for MySQL databases, while PDO can be used with multiple database systems.

• How do you prevent SQL injection attacks in PHP?

Answer: Use prepared statements or parameterized queries to prevent SQL injection attacks in PHP.

• What is the difference between echo and print in PHP?

Answer: Both echo and print are used to output data in PHP. Echo is slightly faster and can output multiple strings at once, while print returns a value of 1 and can only output one string at a time.

• What is a session in PHP?

Answer: A session in PHP is a way to store and retrieve data across multiple pages or requests.

• What is the difference between unset() and unlink() in PHP?

Answer: The unset() function is used to unset a variable, while the unlink() function is used to delete a file.

• What is a cookie in PHP?

Answer: A cookie in PHP is a small file that is stored on the user's computer and can be used to store information about the user.

• What is the difference between == and === in PHP?

Answer: The == operator compares two values for equality, while the === operator compares two values for equality and type.

• What is the use of the error_reporting() function in PHP?

Answer: The error_reporting() function is used to set the level of error reporting in PHP.

• What is the use of the ini_set() function in PHP?

Answer: The ini_set() function is used to set the value of a configuration option in PHP.

• What is a PHP session hijacking attack?

Answer: A PHP session hijacking attack is when an attacker gains access to a user's session ID and uses it to impersonate the user.

• What is the use of the array() function in PHP?

Answer: The array() function is used to create an array in PHP.

Example code:

$fruits = array("apple", "banana", "orange");

• What is the use of the explode() function in PHP?

Answer: The explode() function is used to split a string into an array based on a delimiter.

$string = "Hello, World!";

$words = explode(", ", $string);