What is the most convenient hashing method to be used to hash passwords?
- The most convenient hashing method to be used to hash passwords in PHP is password_hash() with the PASSWORD_DEFAULT algorithm.
- The most convenient hashing method to be used to hash passwords in PHP is md5().
- The most convenient hashing method to be used to hash passwords in PHP is sha1().
- The most convenient hashing method to be used to hash passwords in PHP is base64_encode().
The most convenient hashing method to hash passwords in PHP is password_hash() with the PASSWORD_DEFAULT algorithm. This function provides a secure and convenient way to hash passwords using the recommended bcrypt algorithm. By using password_hash() with PASSWORD_DEFAULT, PHP will automatically use the best available algorithm for hashing passwords. The bcrypt algorithm is designed to be slow and computationally expensive, which makes it resistant to brute-force attacks. Additionally, password_hash() automatically generates and includes a unique salt with each hashed password, making it more secure against rainbow table attacks. It's important to note that the md5() and sha1() functions, while still available in PHP, are considered weak for password hashing and should not be used for this purpose. base64_encode() is not a hashing function but rather an encoding method used to convert binary data to a text format.
What are some of the uses of traits in PHP OOP?
- Code reuse and composition
- Resolving multiple inheritance limitations
- Implementing cross-cutting concerns
- All of the above
Traits in PHP OOP have various uses. They provide code reuse and composition by allowing you to include reusable blocks of code in multiple classes. Traits also help in resolving the limitations of multiple inheritance in PHP, as they can be used to incorporate behaviors from multiple sources into a single class. Additionally, traits are useful for implementing cross-cutting concerns, such as logging or caching, that can be shared among different classes.
Which of the following are true about comments in PHP?
- Comments are ignored by the PHP interpreter during script execution
- Comments can be used to leave notes or explanations for other developers
- Comments are sent to the client's browser along with the executed PHP code
- Comments can be used to alter the logic of the PHP code
Comments in PHP are ignored by the PHP interpreter during script execution. They are purely for developers' benefit and are not sent to the client's browser. Comments can be used to leave notes or explanations for other developers. The last option is incorrect because comments do not alter the logic of the PHP code; they only provide additional information or instructions to the developers. Learn more: https://www.php.net/manual/en/language.basic-syntax.comments.php
Is it possible to extend the execution time of a PHP script?
- Yes
- No
- Depends on the server configuration
- Depends on the PHP version
Yes, it is possible to extend the execution time of a PHP script using the set_time_limit() function or by modifying the max_execution_time directive in the PHP configuration. This allows the script to run for a longer duration. Learn more: http://php.net/manual/en/function.set-time-limit.php
Which of the following are true about the $_POST superglobal in PHP?
- It is used to retrieve data sent via an HTML form using the POST method.
- It is an associative array that stores form data submitted via the POST method.
- It can be accessed using the $_GET superglobal.
- It is only available in PHP versions prior to 5.4.
- All the options
The true statements about the $_POST superglobal in PHP are that it is used to retrieve data sent via an HTML form using the POST method, and it is an associative array that stores the form data submitted via the POST method. When a form is submitted using the POST method, the form data is accessible through the $_POST superglobal using the name attributes of the form inputs as keys. The other options are false as $_POST is separate from the $_GET superglobal, and it is available in PHP versions 5.4 and above. Learn more: https://www.php.net/manual/en/reserved.variables.post.php
What is the purpose of the header() function in PHP?
- To send HTTP headers
- To set the content type of a response
- To redirect to a different page
- All of the above
The header() function in PHP is used to send HTTP headers to the client browser. It can be used to set the content type, perform redirects, set cookies, and more. By sending appropriate headers, you can control the behavior of the browser and the server response. Learn more: http://php.net/manual/en/function.header.php
How do you execute a query in a MySQL database using PHP?
- Using the mysqli_query() function
- Using the mysql_query() function
- Using the pdo_query() function
- Using the database_query() function
To execute a query in a MySQL database using PHP, you can use the mysqli_query() function. This function takes two parameters: the MySQLi object representing the database connection and the SQL query to be executed. It returns a result object that can be used to fetch data or perform other operations. It is important to use prepared statements or proper escaping techniques to prevent SQL injection vulnerabilities when executing user-supplied data as part of the query.
You have been asked to explain the benefits of using PHP for web development to a potential client. What would you say?
- PHP is a client-side scripting language that can't interact with databases.
- PHP is only used for creating static web pages.
- PHP is a server-side scripting language that is easy to learn, with a large standard library and strong database interaction capabilities.
- PHP is a proprietary language with high hosting costs.
PHP offers numerous benefits for web development. As a server-side scripting language, it is capable of performing tasks that client-side languages cannot, such as interacting with databases. It is open-source, easy to learn and use, and supported by a large community. Learn more: https://www.php.net/manual/en/intro-why.php
What are some common practices in PHP session handling?
- Securing session data
- Regenerating session IDs
- Expiring inactive sessions
- Using secure cookies
- All the options
In PHP session handling, some common practices include securing session data by encrypting sensitive information, regenerating session IDs to prevent session fixation attacks, expiring inactive sessions for security purposes, and using secure cookies to transmit session IDs over HTTPS. These practices enhance the security and integrity of sessions in PHP applications. See more at: http://php.net/manual/en/features.sessions.php
How do you create an object in PHP?
- Using the new keyword and the class name
- Using the create() function and the class name
- Using the instanceof keyword and the class name
- Using the object() function and the class name
In PHP, to create an object from a class, you would use the new keyword followed by the class name and parentheses. The correct option is "Using the new keyword and the class name." This instantiates an object based on the defined class. For more information, consult the PHP documentation on creating objects: http://php.net/manual/en/language.oop5.php