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The value of a class constant in PHP cannot be changed once it is ______.

  • defined
  • accessed
  • assigned
  • declared
The value of a class constant in PHP cannot be changed once it is assigned. Once a constant is defined with a specific value, it remains the same throughout the execution of the script. Constants are considered as read-only values. It's important to note that attempting to modify a constant's value will result in a runtime error. To maintain the immutability of constant values, it is recommended to define them with the desired value and avoid any attempts to modify them later. To know more, refer to: http://php.net/manual/en/language.constants.php
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To get the list of all supported filters in PHP, you can use the filter_list() ______.

  • function
  • filters
  • types
  • supported
To get the list of all supported filters in PHP, you can use the filter_list() function. It returns an array containing the names of all available filters. Learn more at: http://php.net/manual/en/function.filter-list.php
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A destructor in a PHP class is called when the object is no longer referenced or explicitly destroyed.

  • no longer referenced or explicitly destroyed
  • instantiated from the class
  • accessed
  • methods invoked
A destructor in a PHP class is called when the object is no longer referenced or explicitly destroyed. The correct option is "no longer referenced or explicitly destroyed." The destructor is automatically triggered by PHP's garbage collection mechanism when there are no more references to the object, or when the unset() function is used to explicitly destroy the object. This allows the destructor to perform any necessary cleanup tasks before the object is freed from memory. For more details, refer to the PHP documentation on destructors: https://www.php.net/manual/en/language.oop5.decon.php#language.oop5.decon.destruct
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What are some ways you can use an object in PHP?

  • Accessing its properties and invoking its methods
  • Storing data and executing functions
  • Manipulating strings and arrays
  • Writing conditional statements and loops
Objects in PHP can be used in various ways. Some common ways to use an object include accessing its properties, which are the stored data within the object, and invoking its methods, which are the functions defined within the object. The correct option is "Accessing its properties and invoking its methods." Objects provide a way to encapsulate data and behavior into a single entity. For more details, refer to the PHP documentation on objects: http://php.net/manual/en/language.oop5.php
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What is the purpose of a loop in PHP?

  • To repeatedly execute a block of code
  • To store multiple values in an array
  • To define constants with changing values
  • To handle errors and exceptions
The purpose of a loop in PHP is to repeatedly execute a block of code. A loop allows you to automate repetitive tasks by executing the same set of instructions multiple times. With loops, you can iterate over arrays, traverse database records, process user input, and perform many other tasks that require repetitive operations. Loops provide a way to make your code more efficient, concise, and maintainable by reducing duplication. They allow you to control the flow of execution and perform actions based on specific conditions or for a known number of iterations. Learn more: https://www.php.net/manual/en/control-structures.while.php, https://www.php.net/manual/en/control-structures.for.php, https://www.php.net/manual/en/control-structures.foreach.php
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How can we access the data sent through the URL with the POST method?

  • You can access the data sent through the URL with the POST method by using the $_POST superglobal array in PHP.
  • You can access the data sent through the URL with the POST method by using the $_GET superglobal array in PHP.
  • You can access the data sent through the URL with the POST method by using the $_REQUEST superglobal array in PHP.
  • You can access the data sent through the URL with the POST method by using the $_SESSION superglobal array in PHP.
To access the data sent through the URL with the POST method in PHP, you can use the $_POST superglobal array. This array contains key-value pairs of the form data submitted using the POST method. For example, if you have an input field with the name username in your form, you can access its value using $_POST['username']. The $_POST array allows you to retrieve and use the data sent through the POST method in your PHP script. It's important to note that you should sanitize and validate any user-provided input to prevent security vulnerabilities and ensure the integrity of your application.
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You have a switch statement in your PHP script and you want to specify what code to execute if none of the cases match the expression. How would you do this using the default keyword?

  • Use the default keyword and specify the code to execute
  • Use an empty case block
  • Use a break statement after the last case block
  • Use an else statement after the switch statement
To specify what code to execute if none of the cases in a PHP switch statement match the expression, you can use the default keyword. The default case is optional and is placed at the end of the switch statement. If none of the case values match the expression, the code block following the default case is executed. This allows you to define a fallback action or a default behavior when none of the specific cases are met. The default case is the last case block in the switch statement and serves as a catch-all option. Learn more: https://www.php.net/manual/en/control-structures.switch.php
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You are writing a PHP script and you need to fetch the content of a web page from a given URL. How would you do this using network functions?

  • Use the file_get_contents() function to fetch the content of the web page
  • Use the curl_init() function to establish an HTTP connection to the web page
  • Use the fsockopen() function to establish a socket connection to the web page
  • Use the fetch_web_page() function to retrieve the content of the web page
To fetch the content of a web page from a given URL in PHP, you can use the file_get_contents() function. This function allows you to pass the URL as a parameter and retrieves the content of the web page as a string. For example, $content = file_get_contents($url); fetches the content of the web page from the specified URL and stores it in the $content variable. This provides a simple way to retrieve web page content in PHP.
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What are some best practices when defining and using class constants in PHP?

  • Use uppercase naming
  • Document the constants
  • Access them statically
  • All of the above
When defining and using class constants in PHP, it is recommended to follow some best practices. These include using uppercase naming conventions to differentiate constants from other class members, documenting the purpose and usage of constants to enhance code readability, and accessing class constants statically using the class name followed by the scope resolution operator (::). These practices contribute to code clarity, maintainability, and consistency. To learn more, see: http://php.net/manual/en/language.oop5.constants.php
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An array in PHP is a type of ______ data type.

  • int
  • float
  • string
  • array
An array in PHP is a type of array data type. Arrays are used to store multiple values in a single variable. They can hold elements of different data types, such as integers, floats, strings, or even other arrays. Arrays in PHP can be indexed or associative, providing flexibility in organizing and accessing data. Arrays are widely used for storing collections of related values or managing complex data structures. Learn more: https://www.php.net/manual/en/language.types.array.php
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