Which PHP function can be used to strip tags from a string, often used to prevent XSS attacks?
- strip_tags()
- htmlspecialchars()
- htmlentities()
- xss_clean()
strip_tags() is used to remove HTML and PHP tags from a string, making it a useful tool for preventing cross-site scripting (XSS) attacks.
Which PDO method is used to begin a transaction?
- beginTransaction()
- startTransaction()
- openTransaction()
- initiateTransaction()
The beginTransaction() method is used to initiate a transaction in PDO. Transactions are essential for maintaining data integrity when multiple database operations need to be atomic.
The session data in PHP is stored by default in the ________ directory on the server.
- /tmp
- /var/sessions
- /sessions
- /session_data
In PHP, session data is, by default, stored in the /tmp directory on the server. Understanding where session data is stored is crucial for managing and securing user sessions in web applications.
Which function in PHP is used to make a connection to a MySQL database?
- mysqli_query
- mysql_connect
- mysqli_connect
- PDO::connect
The correct function is mysqli_connect. This function is used to establish a connection to a MySQL database in PHP using the MySQLi extension.
Which of the following SQL statements is used to retrieve data from a database?
- SELECT
- INSERT
- UPDATE
- DELETE
The 'SELECT' statement is used to retrieve data from a database. It allows you to query and fetch specific data from one or more tables in a database.
What is the concept in OOP where a subclass can have methods with the same name as methods in its parent class?
- Method Overloading
- Method Hiding
- Method Overriding
- Method Inheritance
The concept in OOP where a subclass can have methods with the same name as methods in its parent class is called "Method Overriding." It allows a child class to provide a specific implementation of a method defined in the parent class.
A common method to prevent stored XSS attacks is to store user input in its ________ form.
- Encoded
- Original
- Encrypted
- Compressed
Storing user input in its encoded form can prevent stored Cross-Site Scripting (XSS) attacks, as the data is less likely to be executed as code.
The ________ function in PHP is used to get the last error that occurred during a file operation.
- error_get_last()
- file_get_contents()
- file_exists()
- error_reporting()
The error_get_last() function retrieves the details of the last error, which is useful for debugging and understanding file operation issues in PHP.
In PHP, which of the following keywords is used to access properties and methods of a parent class from a child class?
- super
- parent
- this
- self
In PHP, the 'parent' keyword is used to access properties and methods of a parent class from a child class. This is essential when you want to override a method in the child class while still using the parent class's method.
Which of the following functions in PHP is used to find the position of the first occurrence of a substring in a string?
- strpos()
- substr_position()
- find_string_position()
- locate_string_position()
The strpos() function in PHP is used to find the position of the first occurrence of a substring within a string.