How do you call a user-defined function in PHP?
- call myFunction()
- myFunction()
- invokeFunction(myFunction)
- execute myFunction()
To call a user-defined function in PHP, you simply use the function name followed by parentheses. For example, 'myFunction()' would call the function 'myFunction'.
In a scenario where a user can add multiple fields dynamically in a form, which PHP function can help process the received data on the server side?
- $_POST
- serialize()
- unserialize()
- json_decode()
When a user can add multiple fields dynamically in a form, the received data is processed on the server side using the $_POST superglobal. It contains an array of data sent through the HTTP POST method.
Which function can be used in PHP to filter and sanitize user input?
- filter_input()
- sanitize_input()
- validate_input()
- clean_user_input()
The filter_input() function in PHP is used to filter and sanitize user input, ensuring it meets specific criteria or requirements. It's crucial for data security.
You're developing a PHP application where you need to segregate classes that handle database operations and email sending. Which feature of PHP allows you to group these classes in a way that they can coexist even if they have the same class name?
- Namespaces
- Traits
- Interfaces
- Abstract Classes
Namespaces in PHP allow you to group classes and avoid naming conflicts, even if they have the same class name. This is essential for organizing code and preventing naming collisions.
You are working on an online exam portal. To ensure that the user doesn't get the same session ID even if they retake the exam, what should you do at the beginning of each exam?
- Regenerate a New Session ID
- Use Local Storage for Session Management
- Maintain the Same Session ID
- Use Cookies for Session Management
To ensure that the user gets a new session ID for each exam attempt, it's crucial to "Regenerate a New Session ID" at the beginning of each exam. This prevents session re-use and maintains exam integrity.
When a user logs out of a web application, which PHP function should be used to completely destroy a session?
- session_destroy()
- session_start()
- session_unset()
- unset($_SESSION)
The session_destroy() function is used to completely destroy a session in PHP, ensuring the user is logged out and their session data is wiped clean.
In PHP, the superglobal that can be used to get variables passed to the current script via URL parameters is ________.
- $_GET
- $_REQUEST
- $_POST
- $_SESSION
The $_GET superglobal in PHP is used to retrieve variables passed to the current script via URL parameters. It's commonly used for reading data from URLs.
Which PHP function can be used to customize the error handler?
- set_error_handler()
- custom_error_handler()
- modify_error_handler()
- handle_error()
The set_error_handler() function in PHP is used to customize the error handler. It allows you to define a custom error-handling function to manage how errors are handled in your PHP application.
Which function in PHP returns a formatted string?
- sprintf()
- printf()
- str_format()
- format_string()
The sprintf() function in PHP is used to return a formatted string. It allows you to create formatted strings using placeholders and values, similar to printf() in C.
In dynamic forms where fields can be added or removed by the user, the server-side processing in PHP should use the ________ function to ensure data integrity.
- 'isset()'
- 'array_push()'
- 'count()'
- 'filter_var()'
The correct option is 'count().' In dynamic forms, where the number of fields can change, using 'count()' helps ensure data integrity by determining how many fields have been submitted and handling them appropriately. This is important for server-side validation.