How can we pass a variable through navigation between pages?
- Using query strings
- Using session variables
- Using global variables
- Using cookies
In PHP, one way to pass a variable through navigation between pages is by using query strings. Query strings allow you to append data to the URL, which can then be accessed by the target page using the $_GET superglobal array. Learn more: http://php.net/manual/en/reserved.variables.get.php
In PHP, an interface is defined using the interface keyword.
- TRUE
- FALSE
- nan
- nan
In PHP, an interface is indeed defined using the interface keyword. This keyword is placed before the name of the interface and is used to declare the interface. An interface consists of method signatures without implementation and can also define constants. Interfaces establish a contract that classes must adhere to when implementing the interface. Classes that implement an interface must provide an implementation for all the methods defined in the interface. The interface keyword is crucial for properly defining an interface in PHP. For more details, refer to: http://php.net/manual/en/language.oop5.interfaces.php
On which of the following operating systems can PHP be installed?
- Linux
- Windows
- macOS
- All of the above
PHP is cross-platform, which means it can be installed on multiple operating systems including Linux, Windows, and macOS. This is one of the reasons for PHP's widespread use, as developers aren't limited to a specific OS. It can be installed standalone or as part of a package like LAMP (Linux), WAMP (Windows), or MAMP (macOS). Learn more: https://www.php.net/manual/en/install.php
A common use case for the $GLOBALS superglobal in PHP is to access global variables from within a function, which would otherwise be out of the function's ______.
- Local scope
- Global scope
- Class scope
- Static scope
The correct option is 2. A common use case for the $GLOBALS superglobal in PHP is to access global variables from within a function that would otherwise be out of the function's scope. By using $GLOBALS, you can retrieve and manipulate global variables within the function's local scope without the need for the global keyword. This allows you to work with global variables directly within the function, providing more flexibility and convenience. However, it is generally recommended to minimize the use of global variables and consider alternative approaches, such as passing variables as parameters or using object-oriented design principles, for better code organization and maintainability. Learn more: https://www.php.net/manual/en/reserved.variables.globals.php
Which of the following are valid PHP variable names?
- $my_var
- $123abc
- $_VAR
- All of the above
In PHP, variable names must start with a letter or an underscore (_), followed by any number of letters, numbers, or underscores. So, $my_var and $_VAR are valid variable names, but $123abc is not because it starts with a number. Learn more: https://www.php.net/manual/en/language.variables.basics.php
What is the purpose of the htmlspecialchars() function in PHP?
- To convert special characters to HTML entities
- To remove HTML tags from a string
- To encode a URL
- To convert HTML entities to special characters
The htmlspecialchars() function in PHP is used to convert special characters to their corresponding HTML entities. This prevents the characters from being interpreted as HTML tags or entities when rendered in an HTML document. It helps prevent cross-site scripting (XSS) attacks. Learn more: http://php.net/manual/en/function.htmlspecialchars.php
You are writing a PHP script and you want to execute a block of code a fixed number of times. How would you do this using a for loop?
- Initialize a counter variable, set the termination condition, and update the counter after each iteration.
- Use the while loop with a counter variable that increments each time the loop is executed.
- Use the do...while loop and set the termination condition as the fixed number of times the code should run.
- Use the foreach loop to iterate over an array and execute the code for each element.
To execute a block of code a fixed number of times in PHP, you can use a for loop. Initialize a counter variable, set the termination condition to the fixed number of times, and update the counter after each iteration. This allows you to have precise control over the number of iterations the loop will perform. A for loop is specifically designed for situations when you know the exact number of iterations in advance. Learn more: https://www.php.net/manual/en/control-structures.for.php
What is a function in PHP?
- A function in PHP is a block of reusable code that performs a specific task.
- A function in PHP is a variable used to store data.
- A function in PHP is a statement used to control the flow of execution.
- A function in PHP is a loop used to iterate over an array.
The correct option is: "A function in PHP is a block of reusable code that performs a specific task." Functions in PHP are used to encapsulate a set of instructions that can be called and executed multiple times throughout a program. They help in organizing code, promoting reusability, and improving code readability. Learn more: https://www.php.net/manual/en/language.functions.php
What are some commonly used miscellaneous functions available in PHP?
- strlen(), strtotime(), file_exists()
- array_merge(), json_encode(), htmlspecialchars()
- trim(), substr(), strtolower()
- All of the above
PHP provides a wide range of miscellaneous functions for various tasks. Some commonly used miscellaneous functions in PHP include strlen() (to get the length of a string), strtotime() (to convert a date/time string to a Unix timestamp), and file_exists() (to check if a file or directory exists). Other frequently used functions include array_merge(), json_encode(), htmlspecialchars(), trim(), substr(), strtolower(), and many more. These functions offer functionality for string manipulation, file handling, array operations, and other common tasks in PHP programming.
The sort() function in PHP maintains the association between keys and values in an associative array.
- FALSE
- TRUE
The correct option is 2. The sort() function in PHP rearranges the elements of an array in ascending order based on their values. However, it does not maintain the association between keys and values in an associative array. After sorting, the keys may be reassigned in ascending order, and the original association between keys and values may be lost. It is important to note that sort() works primarily on indexed arrays and may not produce the expected results when used with associative arrays. If you need to maintain the association between keys and values, you can use other sorting functions like asort() or ksort(). Learn more: https://www.php.net/manual/en/function.sort.php