What is the meaning of a Persistent Cookie?
- A cookie that never expires
- A cookie that is always secure
- A cookie that is shared across pages
- A cookie that is permanent
A persistent cookie is a type of cookie that is stored on the user's device even after they close their browser. It has an expiration date set in the future. Learn more: http://php.net/manual/en/function.setcookie.php
You are tasked with creating a PHP function that accepts a filename, opens the file, prints its contents, and then closes the file. How would you approach this task?
- Use the fopen() function to open the file, read its contents using fread() or other file reading functions, print the contents, and then close the file using fclose()
- Use the readfile() function to directly output the file contents, and then close the file using fclose()
- Use the file_get_contents() function to read the entire file into a string, print the contents, and then close the file using fclose()
- Use the file() function to read the file line by line into an array, print the contents, and then close the file using fclose()
You can create a PHP function that accepts a filename. Inside the function, you would use fopen() to open the file, fread() or other file reading functions to read its contents, print the contents as desired, and then close the file using fclose(). This ensures proper file handling and cleanup after printing the contents.
What PHP function can be used to write to a file?
- readfile()
- file_get_contents()
- fwrite()
- fopen()
The fwrite() function in PHP is used to write to a file. It takes the file handle obtained from fopen() as the first argument and the content to write as the second argument. It returns the number of bytes written or false on failure.
The same function name can be used for multiple functions in the same PHP script.
- TRUE
- FALSE
Yes, in PHP, you can define multiple functions with the same name in the same script. This is known as function overloading. However, unlike some other programming languages, PHP does not support function overloading by differentiating functions based on the number or type of arguments. The most recently declared function with the same name will be used. Learn more: https://www.php.net/manual/en/functions.user-defined.php
Which of the following are ways to make a field required in a PHP form?
- Using the required attribute in HTML
- Implementing server-side validation in PHP
- Using JavaScript to validate the field on the client-side
- All of the above
All of the above options are ways to make a field required in a PHP form. You can use the required attribute in HTML to enforce client-side validation, ensuring that the field must be filled out before submitting the form. Implementing server-side validation in PHP allows you to check if the required field has been submitted with a value. Using JavaScript on the client-side provides an additional layer of validation to ensure the field is not left empty before submitting the form. It is recommended to use a combination of client-side and server-side validation to ensure the integrity and security of form submissions. Learn more: https://www.php.net/manual/en/tutorial.forms.php
One of the main benefits of using OOP in PHP is that it helps in organizing the code in a ______ and modular way.
- Clear and structured
- Hierarchical
- Linear
- Flexible
The main benefit of using OOP in PHP is that it helps in organizing the code in a clear and structured way. Object-oriented programming allows for modular development, where code is encapsulated within classes and objects. The correct option is "Clear and structured." While hierarchical, linear, and flexible can be desirable qualities, they don't specifically capture the main benefit of organization and modularity provided by OOP. For more information, consult the PHP documentation on object-oriented programming: http://php.net/manual/en/language.oop5.php
In PHP, you can define a constant in a class using the const keyword like const CONSTANT_NAME = ______.
- value
- expression
- variable
- string
In PHP, you can define a constant in a class using the const keyword followed by the constant name, the assignment operator =, and the desired value. For example: const CONSTANT_NAME = value; Constants are used to store values that remain the same throughout the execution of a script and cannot be changed once defined. They provide a convenient way to define and use fixed values within a class. Refer to: http://php.net/manual/en/language.constants.php
What function do you use in PHP to execute a query against a MySQL database?
- mysqli_query()
- mysql_query()
- pdo_query()
- execute_query()
In PHP, you can use the mysqli_query() function to execute a query against a MySQL database. This function takes two parameters: the connection object and the SQL query you want to execute. The SQL query can be any valid MySQL statement, such as SELECT, INSERT, UPDATE, or DELETE. The mysqli_query() function returns a result object for successful SELECT queries or a boolean value for other types of queries. It's important to use prepared statements or proper escaping techniques to prevent SQL injection vulnerabilities when executing user-supplied data as part of the query.
To access data from the $_SERVER superglobal in PHP, you can use $_SERVER['element'] where 'element' is the name of the ______ you wish to access.
- Key
- Index
- Element
- Property
To access specific data from the $_SERVER superglobal array in PHP, you can use the $_SERVER['element'] syntax. Here, 'element' refers to the specific key or index of the information you want to access. For example, $_SERVER['REQUEST_METHOD'] retrieves the HTTP request method used to access the current script. By using the correct key or index, you can retrieve the desired information from the $_SERVER array. Learn more: https://www.php.net/manual/en/reserved.variables.server.php
You should always close a file in PHP using the fclose() function after you're done writing to it.
- TRUE
- FALSE
Absolutely! It is good practice in PHP to close the file after you have finished writing to it. This is done using the fclose() function, which releases the resources associated with the file and ensures proper cleanup. By closing the file, you also free up system resources and make them available for other operations.