Which of the following are common uses of the $_REQUEST superglobal in PHP?
- Retrieving form data submitted through both GET and POST methods.
- Accessing session variables.
- Retrieving server environment variables.
- Executing SQL queries on the database.
The $_REQUEST superglobal is commonly used for retrieving form data submitted through both GET and POST methods. It provides a simple way to access user input without having to differentiate between the two methods. However, it is not used for accessing session variables, server environment variables, or executing SQL queries on the database. Learn more: https://www.php.net/manual/en/reserved.variables.request.php
Which of the following are true about arrays in PHP?
- Arrays can only store values of the same data type.
- Arrays can have both numeric and string keys.
- Arrays cannot be nested within each other.
- Arrays cannot be modified once they are created.
In PHP, arrays can have both numeric and string keys. This allows for flexibility in accessing and organizing data within the array. Arrays can store values of different data types, including strings, integers, floats, booleans, and even other arrays. Additionally, arrays can be modified by adding, updating, or removing elements. Nesting arrays within each other is also possible, leading to multidimensional arrays. Learn more: https://www.php.net/manual/en/language.types.array.php
Which of the following are common uses of PHP?
- Creating static HTML pages.
- Advanced machine learning.
- Web scraping.
- High-performance game development.
While PHP can be used for a variety of tasks, one of its most common uses is web scraping, where PHP scripts can be written to automatically gather data from web pages. Learn more: https://www.php.net/manual/en/book.dom.php
What does $_COOKIE mean?
- An array of cookie variables
- A predefined cookie constant
- A function for handling cookies
- A global function
In PHP, $_COOKIE is an array that holds cookies sent by the client to the server. It provides access to cookie values. Learn more: http://php.net/manual/en/reserved.variables.cookies.php
What PHP superglobal array holds the information about uploaded files?
- $_FILES
- $_POST
- $_GET
- $_REQUEST
The $_FILES superglobal array in PHP holds the information about uploaded files. It provides access to the file name, temporary file location, file size, and other details of the uploaded file. This array is available after a file has been uploaded using an HTML form with the appropriate settings.
What is a common use case for the $_GET superglobal in PHP?
- Retrieving data sent via an HTML form using the GET method.
- Storing data in cookies.
- Accessing data from the URL's query string.
- Processing user input from an HTML form using the POST method.
A common use case for the $_GET superglobal in PHP is to access data from the URL's query string. This can include parameters or values passed through the URL, such as search queries, page identifiers, or filter criteria. By retrieving data from the query string using $_GET, you can dynamically generate content, perform searches, or filter data based on user input. However, it is not used for retrieving form data using the GET method or processing user input using the POST method. Learn more: https://www.php.net/manual/en/reserved.variables.get.php
What are some common practices in PHP when working with MySQL databases?
- Using prepared statements or parameterized queries
- Sanitizing and validating user input
- Handling database errors and exceptions
- All of the above
When working with MySQL databases in PHP, it is good practice to use prepared statements or parameterized queries to prevent SQL injection vulnerabilities. Sanitizing and validating user input is crucial to ensure the security and integrity of the data stored in the database. Additionally, handling database errors and exceptions appropriately helps in detecting and resolving issues during database operations. Following these practices helps in writing secure, reliable, and efficient PHP code when interacting with MySQL databases.
PHP allows for both single-line and multi-line comments.
- TRUE
- FALSE
PHP does support both single-line and multi-line comments. Single-line comments can start with // or #, while multi-line comments are enclosed between /* and */. Comments are a critical part of any programming language, allowing developers to add context or explanation to their code, or to prevent certain lines of code from being executed without deleting them. Learn more: https://www.php.net/manual/en/language.basic-syntax.comments.php
Which of the following are reasons to use comments in PHP code?
- Documenting code to improve readability and maintainability
- Explaining complex logic or algorithms
- Temporarily disabling a block of code for testing purposes
- All of the above
Comments serve various purposes in PHP code. They can be used to document code, making it easier for developers to understand and maintain the codebase. Comments can also explain complex logic or algorithms to improve comprehension. Additionally, comments can be used to temporarily disable a block of code for testing purposes. All of the given options are valid reasons to use comments in PHP code. Learn more: https://www.php.net/manual/en/language.basic-syntax.comments.php
What can be the potential issues with using break and continue in PHP?
- Overuse of break and continue can make the code harder to read and understand.
- Break and continue can lead to infinite loops if used improperly.
- Break and continue can cause errors in the code execution.
- Overuse of break and continue can improve code readability.
The correct option is: "Break and continue can lead to infinite loops if used improperly." When using break and continue statements, it's important to ensure they are placed correctly within the loop and that the loop's termination condition is eventually met to avoid infinite loops. Learn more: https://www.php.net/manual/en/control-structures.break.php, https://www.php.net/manual/en/control-structures.continue.php