How can you implement secure password hashing in PHP? Discuss the password_hash() and password_verify() functions.
- Secure password hashing in PHP can be implemented using the password_hash() function to generate a hash of the password and the password_verify() function to compare the provided password with the stored hash. These functions utilize secure algorithms, such as bcrypt, and automatically handle the salting and stretching of passwords. It is recommended to use these functions instead of manual hashing techniques to ensure password security.
- Secure password hashing in PHP is not possible; it is recommended to store passwords in plain text.
- Secure password hashing in PHP can be achieved by using the hash() function with the PASSWORD_BCRYPT algorithm.
- Secure password hashing in PHP can be implemented using the md5() function.
Secure password hashing in PHP is crucial for protecting user passwords. The password_hash() function is used to securely hash passwords using industry-standard algorithms such as bcrypt. It automatically handles the generation of a unique salt and multiple iterations, making the hashing process more secure. The password_verify() function is used to verify a user's entered password against the stored hash. By using these functions, you can significantly improve the security of user passwords and protect against common attacks such as rainbow table attacks. It is strongly recommended to use these functions instead of manual hashing techniques. For more information, you can refer to the PHP documentation: http://php.net/manual/en/function.password-hash.php, http://php.net/manual/en/function.password-verify.php
PHP can be used to develop static web pages.
- TRUE
- FALSE
While PHP is primarily used for creating dynamic web pages, it can also be used to create static web pages. Learn more: https://www.php.net/manual/en/intro-whatcando.php
What is the definition of a session?
- A way to store cookies
- A way to secure passwords
- A way to store data
- A way to optimize code
A session in PHP is a way to store persistent data across multiple requests and pages for a specific user. Learn more: http://php.net/manual/en/intro.session.php
How do you define a class in PHP?
- Using the class keyword
- Using the define() function
- Using the object keyword
- Using the function keyword
In PHP, to define a class, you would use the class keyword followed by the name of the class. The correct option is "Using the class keyword." This allows you to define the structure, properties, and methods of the class. For further details, refer to the PHP documentation on defining classes: http://php.net/manual/en/language.oop5.php
You want to include a note in your PHP code for other developers, but you don't want this note to affect the execution of the script. How would you do this?
- Include the note as an HTML comment.
- Include the note as a PHP comment.
- Add the note to the PHP error log file.
- Send the note to the developers separately.
In PHP, you can include notes or annotations in your code using comments. Comments in PHP start with // for a single-line comment or /* and end with */ for multi-line comments. Comments are ignored by the PHP interpreter, so they don't affect the execution of your script. Learn more: https://www.php.net/manual/en/language.basic-syntax.comments.php
Which of the following are common uses of the filter_var() function in PHP?
- Filtering user input
- Validating email addresses
- Sanitizing form data
- Validating URLs
- Filtering user input or Validating email addresses
The filter_var() function in PHP is commonly used for filtering user input and validating email addresses. It provides filters specifically designed for these purposes. By applying appropriate filters, you can ensure that user input is in the desired format and meets certain validation criteria. Additionally, the filter_var() function can be used for other purposes, such as sanitizing form data and validating URLs. Learn more at: http://php.net/manual/en/function.filter-var.php
You have a PHP script and you need to validate an email address. How would you do this using Regular Expressions in PHP?
- Use the preg_match() function with a Regular Expression pattern for email validation.
- Use the strtoupper() function to convert the email address to uppercase.
- Use the substr() function to extract a part of the email address.
- Use the is_numeric() function to check if the email address is a number.
To validate an email address using Regular Expressions in PHP, you can use the preg_match() function along with a Regular Expression pattern specifically designed for email validation. By passing the email address as the string to be checked and the appropriate Regular Expression pattern for email validation as the first argument, you can determine whether the email address matches the pattern or not. This allows you to perform a basic validation of email addresses and ensure they conform to the expected format. Learn more: https://www.php.net/manual/en/function.preg-match.php
Which programming language does PHP resemble?
- Perl
- Python
- Ruby
- Java
PHP resembles Perl in terms of syntax and features. Both languages share similar characteristics, such as a focus on web development and support for regular expressions.
An example of a superglobal in PHP is $_POST, which is used to collect form data sent with the ______ method.
- POST
- GET
- REQUEST
- SUBMIT
The correct option is 1. An example of a superglobal in PHP is $_POST. The $_POST superglobal is used to collect form data sent with the POST method. When an HTML form is submitted with the POST method, the form data is available in the $_POST superglobal as an associative array. The $_POST superglobal allows you to access the form data and process it in your PHP script. It is commonly used to handle form submissions and perform actions based on the submitted data. Other superglobals in PHP include $_GET, $_REQUEST, and $_SERVER. Learn more: https://www.php.net/manual/en/reserved.variables.post.php
In PHP, a callback function is a function that is passed as an argument to another function.
- Another function
- A class method
- An event handler function
- All of the above
In PHP, a callback function is a function that is passed as an argument to another function. This allows the receiving function to call the callback function at a later point in the code. Callback functions are commonly used in PHP for various purposes, such as event handling, dynamic function invocation, and more. The correct option is "Another function" as it covers the general use case of callback functions in PHP. For further information, consult the PHP documentation on callback functions: http://php.net/manual/en/language.types.callable.php