To check if a specific cookie is set in PHP, you can use the ________ superglobal array.
- $_GET
- $_SESSION
- $_COOKIE
- $_POST
The correct option is $_COOKIE. In PHP, $_COOKIE is a superglobal array used to access cookies set in the client's browser.
To replace all occurrences of a search string with a replacement string in PHP, you would use the ________ function.
- str_replace()
- replace_string()
- find_replace()
- substitute_string()
The str_replace() function is used in PHP to replace all occurrences of a search string with a replacement string within a given string.
Which of the following PHP functions can be used to move an uploaded file to a desired location?
- move_uploaded_file()
- copy_file()
- upload_file()
- relocate_file()
The 'move_uploaded_file()' function is specifically designed for moving an uploaded file to a desired location. It handles security checks and ensures the move is safe.
You are debugging a complex issue in a PHP application. Which tool or function might be most helpful in tracing the sequence of function calls leading to the error?
- a) echo()
- b) var_dump()
- c) debug_backtrace()
- d) set_error_handler()
c) The debug_backtrace() function is the most helpful for tracing the sequence of function calls leading to the error. It provides a backtrace of the function calls made to reach the current point, making it invaluable for debugging complex issues. The other options (a, b, d) have different purposes and are not specifically designed for this task.
In PDO, the ________ method is used to bind a value to a parameter.
- bindParam()
- exec()
- query()
- connect()
The 'bindParam()' method in PDO is used to bind a value to a parameter in a prepared statement, allowing for secure and efficient parameterized queries.
What is the primary purpose of the error_reporting() function in PHP?
- To hide errors
- To display PHP version information
- To set the error reporting level
- To suppress error messages
The error_reporting() function is used to set the error reporting level, allowing developers to control which errors are displayed, aiding debugging.
Why is it advisable to use exit() or die() after triggering a user-level error in PHP?
- To immediately halt script execution on error
- To allow the script to continue running, ignoring the error
- To provide a detailed error message to the user
- To log the error and continue script execution
Using exit() or die() after a user-level error is advisable because it immediately halts the script execution, preventing further processing that may lead to undesirable consequences due to the error.
The function in PHP that converts a JSON string into a PHP object is ________.
- json_decode()
- json_encode()
- json_parse()
- json_serialize()
To convert a JSON string into a PHP object in PHP, you should use the 'json_decode()' function. It parses the JSON data and creates a PHP object.
Consider a scenario where you want to retrieve a list of employees and their assigned projects. However, some employees are not assigned to any project. Which type of JOIN would be best suited to get this information without omitting any employee?
- LEFT JOIN
- INNER JOIN
- RIGHT JOIN
- FULL OUTER JOIN
A LEFT JOIN retrieves all rows from the left table (employees) and the matching rows from the right table (projects). It includes employees with no matching projects, meeting the requirement.
You're writing a custom exception class in PHP to handle specific types of errors in your application. Which built-in PHP class would you extend to achieve this?
- Exception
- Error
- Throwable
- CustomException (No built-in class)
To create a custom exception class in PHP, you extend the built-in Exception class. This allows you to handle specific types of errors in your application.