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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
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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
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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
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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
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What is a common use case for the $_POST superglobal in PHP?

  • Retrieving data sent via an HTML form using the POST method.
  • Retrieving data sent via an HTML form using the GET method.
  • Retrieving data sent via the URL's query string.
  • Retrieving data stored in cookies.
A common use case for the $_POST superglobal in PHP is to retrieve data submitted via an HTML form using the POST method. This allows you to handle form submissions and process the data securely, especially when dealing with sensitive information like passwords or personal details. By using $_POST, the data is not visible in the URL and is not stored in the browser's history. Learn more: https://www.php.net/manual/en/reserved.variables.post.php
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In PHP, what is the difference between break and continue statements?

  • The break statement terminates the loop, while continue skips to the next iteration
  • The break statement resumes the next iteration, while continue terminates the loop
  • The break statement is used in loops, while continue is used in switch statements
  • The break statement is used to skip code, while continue is used to terminate the loop
The correct option is: "The break statement terminates the loop, while continue skips to the next iteration." The break statement is used to exit a loop entirely, while the continue statement skips the remaining code in the current iteration and moves on to the next iteration of the loop. They serve different purposes in controlling the flow of a loop. Learn more: https://www.php.net/manual/en/control-structures.break.php, https://www.php.net/manual/en/control-structures.continue.php
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After creating a MySQL table and executing your queries, you should close the connection to the MySQL server using the mysqli_close function like mysqli_close(______).

  • $conn
  • $result
  • $mysqli_connection
  • $query
After creating a MySQL table and executing your queries, it's good practice to close the connection to the MySQL server. To do this, you can use the mysqli_close function. It takes the connection object ($conn) as a parameter and closes the connection. Make sure to pass the correct connection object to mysqli_close, like mysqli_close($conn), to close the connection properly. Although PHP automatically closes the connection at the end of the script execution, it's recommended to explicitly close the connection when it's no longer needed to free up resources.
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You can explicitly set the keys in an indexed array in PHP.

  • TRUE
  • FALSE
False. In PHP, the keys in an indexed array are automatically assigned starting from 0 and incremented by 1. While you cannot explicitly set the keys in an indexed array, you can explicitly assign values to the elements of the array. The keys are generated automatically based on the element's position within the array. However, in an associative array, you can explicitly set keys to associate specific values. Learn more: https://www.php.net/manual/en/language.types.array.php#language.types.array.syntax
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Explain the concept of dependency injection in PHP. How does it promote loose coupling and better testability?

  • Dependency injection is a design pattern in PHP where dependencies of a class are provided from outside rather than being created within the class itself. This promotes loose coupling, as the class no longer needs to know how to create its dependencies. It also improves testability, as dependencies can be easily mocked or replaced during testing.
  • Dependency injection in PHP is a way to inject external dependencies into a class. This promotes tight coupling between classes, as they become dependent on each other. Dependency injection improves testability by making it easier to isolate dependencies during unit testing.
  • Dependency injection is a technique in PHP where a class is injected into another class as a dependency. This promotes tight coupling between classes, as they become dependent on each other. Dependency injection improves testability by making it easier to test a class in isolation.
  • Dependency injection is not supported in PHP.
Dependency injection is a powerful technique in PHP that improves code maintainability and testability. It allows you to inject dependencies into a class from the outside, making the class more modular and decoupled from its dependencies. This promotes loose coupling and makes it easier to replace or mock dependencies during testing. The concept of dependency injection involves passing dependencies to a class through constructor injection or setter injection. For more information, you can refer to the PHP documentation: http://php.net/manual/en/language.oop5.decon.php
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What is the purpose of the array_pop() function in PHP?

  • To remove and return the last element of an array
  • To add an element to the beginning of an array
  • To sort the elements of an array
  • To merge two arrays into a single array
The array_pop() function in PHP is used to remove and return the last element of an array. It modifies the original array by removing the last element and returns that element. This function is useful when you need to retrieve and remove the last element from an array. Learn more: http://php.net/manual/en/function.array-pop.php
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What does $GLOBALS mean?

  • An array of global variables
  • A constant representing the Earth
  • A global function
  • A reserved keyword
In PHP, $GLOBALS is an array that holds references to all variables that are currently defined in the global scope. It allows access to global variables from anywhere in the PHP script. Learn more: http://php.net/manual/en/reserved.variables.globals.php
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The ______ data type in PHP is used to store a number with a decimal point.

  • int
  • float
  • string
  • array
The float data type in PHP is used to store a number with a decimal point. Floats, also known as floating-point numbers or doubles, can represent real numbers and are used when precision is required in calculations involving decimal values. Floats can hold positive and negative values with varying degrees of precision. Learn more: https://www.php.net/manual/en/language.types.float.php
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