You are writing a PHP script and you need to filter multiple inputs. How would you do this?
- Use the filter_input_array() function with the appropriate filters and input types
- Use the filter_var_array() function with the appropriate filters and input types
- Loop through the input values and apply the desired filters and validations individually
- All of the above
To filter multiple inputs in a PHP script, you can use either the filter_input_array() function or the filter_var_array() function. Both functions allow you to specify the filters and input types to apply to the multiple inputs. You can loop through the input values and apply the desired filters and validations individually as well. All of the mentioned options are valid approaches to filter multiple inputs in PHP. For further details, refer to the PHP documentation on filter_input_array() (http://php.net/manual/en/function.filter-input-array.php) and filter_var_array() (http://php.net/manual/en/function.filter-var-array.php).
How do you define a destructor in a PHP class?
- Using the __destruct() method
- Using the destroy() method
- Using the delete() method
- Using the finalize() method
In PHP, you can define a destructor in a class using the __destruct() method. The correct option is "Using the __destruct() method." This special method is automatically called when an object is no longer referenced or explicitly destroyed. It is used to perform any necessary cleanup tasks or deallocate resources held by the object. For further details, refer to the PHP documentation on destructors: https://www.php.net/manual/en/language.oop5.decon.php#language.oop5.decon.destruct
A common practice in PHP forms is to validate user inputs such as email and URL to prevent ______.
- SQL injection attacks
- Cross-Site Scripting (XSS) attacks
- Cross-Site Request Forgery (CSRF) attacks
- Code injection attacks
A common practice in PHP forms is to validate user inputs such as email and URL to prevent Cross-Site Scripting (XSS) attacks. By validating user inputs, you can ensure that any malicious script or code is not executed when displaying the user's input on the webpage. This helps to protect the application and its users from potential security vulnerabilities. For more details on web security in PHP, check: php.net/manual/en/security.php
In PHP forms, you can make a field required by using the required attribute in the HTML.
- TRUE
- FALSE
The statement is true. In PHP forms, you can make a field required by using the required attribute in the HTML. The required attribute is an HTML attribute introduced in HTML5 that can be added to form fields. When this attribute is included, the browser ensures that the field must be filled out by the user before the form can be submitted. The required attribute provides a client-side validation mechanism to enforce the field's requirement. While PHP can also perform server-side validation, the required attribute is an additional layer of validation provided by the HTML form itself. Learn more: https://www.w3schools.com/tags/att_input_required.asp
To make a single-line comment in PHP, you can use ______ or ______ at the beginning of the line.
- // or #
- /* or */
- All of the above
Single-line comments in PHP can be written using either double slashes (//) or a hash symbol (#) at the beginning of the line. The other options are not used for single-line comments. In PHP, everything after // or # on a line is considered a comment and is ignored by the PHP interpreter. Learn more: https://www.php.net/manual/en/language.basic-syntax.comments.php
How can you filter multiple inputs in PHP?
- filter_var()
- sanitize_input()
- validate_input()
- filter_input_array()
The filter_input_array() function in PHP is used to filter multiple inputs at once. It takes an input array and applies a specified filter to each element of the array. To learn more, refer to: http://php.net/manual/en/function.filter-input-array.php
What is the purpose of the array_search() function in PHP?
- To search for a value in an array
- To sort the elements of an array
- To filter the elements of an array
- To count the number of elements in an array
The array_search() function in PHP is used to search for a specific value in an array and return the corresponding key if found. It performs a linear search through the array and returns the key of the first matching element or false if the value is not found. Learn more: http://php.net/manual/en/function.array-search.php
What are the differences between an abstract class and a regular class in PHP?
- Instantiation: An abstract class cannot be instantiated directly, while a regular class can be instantiated.
- Method Requirements: An abstract class can have abstract methods that must be implemented in subclasses, while a regular class can have only concrete methods.
- Purpose: An abstract class serves as a blueprint for other classes, whereas a regular class can be used independently without inheritance.
- Properties: An abstract class can contain properties that are not allowed in a regular class.
- All the options
Abstract classes and regular classes in PHP have some notable differences. Abstract classes cannot be instantiated directly, whereas regular classes can be instantiated to create objects. Abstract classes are meant to be extended by other classes, while regular classes can be instantiated and used independently. Abstract classes may contain abstract methods without implementation, while regular classes typically have all their methods implemented. These distinctions define the nature and purpose of each type of class in PHP OOP. To know more, refer to: http://php.net/manual/en/language.oop5.abstract.php
In a PHP do...while loop, the condition is tested ______ the code block is executed.
- After
- Before
- Along with
- Within
In a PHP do...while loop, the condition is tested after the code block is executed. This means that the code block is always executed at least once, and then the condition is checked. If the condition evaluates to true, the loop continues to execute. If the condition is false, the loop terminates. The condition is evaluated at the end of each iteration, allowing the code block to execute before checking the condition for further iterations. Learn more: https://www.php.net/manual/en/control-structures.do.while.php
Which of the following are valid ways to add comments to PHP code?
- // This is a comment
- # This is a comment
- /* This is a comment */
- All of the above
PHP supports different ways to add comments. Single-line comments can be denoted with double slashes (//) or a hash symbol (#) at the beginning of a line. Multi-line comments can be enclosed between /* and */. All of the provided options are valid ways to add comments to PHP code. Learn more: https://www.php.net/manual/en/language.basic-syntax.comments.php