What does $_SERVER mean?

  • An array of server variables
  • A predefined server constant
  • A function for server-side scripting
  • A global function
In PHP, $_SERVER is an array that contains server information, such as headers, paths, and script locations. It is a superglobal variable accessible from anywhere in the PHP script. Learn more: http://php.net/manual/en/reserved.variables.server.php

The $_POST superglobal in PHP is often used to collect form data sent via the POST method.

  • TRUE
  • FALSE
The statement is true. The $_POST superglobal is commonly used to collect form data submitted via the POST method. When an HTML form is submitted with the POST method, the form data is sent in the body of the HTTP request, and PHP populates the $_POST superglobal with the submitted values. This allows developers to access and process the form data securely. Learn more: https://www.php.net/manual/en/reserved.variables.post.php

What is the purpose of the json_last_error_msg() function in PHP?

  • To retrieve a human-readable error message from the last JSON-related error
  • To get the error code from the last JSON-related error
  • To display the last JSON-related error as a message
  • To clear the last JSON-related error
The json_last_error_msg() function in PHP is used to retrieve a human-readable error message from the last JSON-related error that occurred. It provides a descriptive error message explaining the cause of the error. The other mentioned options (To get the error code from the last JSON-related error, To display the last JSON-related error as a message, To clear the last JSON-related error) do not accurately describe the purpose of the json_last_error_msg() function. For more details, refer to the PHP documentation on json_last_error_msg(): http://php.net/manual/en/function.json-last-error-msg.php

How do you sort an associative array by its keys in PHP?

  • Use the ksort() function.
  • Use the sort() function.
  • Use the asort() function.
  • Use the rsort() function.
To sort an associative array by its keys in PHP, you would use the ksort() function. The ksort() function arranges the elements of an associative array in ascending order based on their keys. The values associated with each key remain linked to their corresponding keys even after sorting. This function directly modifies the original associative array by rearranging its key-value pairs. Sorting an associative array by keys can be useful when you need to organize and retrieve data based on a specific key order. Learn more: https://www.php.net/manual/en/function.ksort.php

The elseif statement in PHP can be used to test multiple conditions.

  • TRUE
  • FALSE
  • nan
  • nan
The elseif statement in PHP can be used to test multiple conditions. It allows you to specify a new condition to be checked if the preceding if condition is false. By using elseif, you can create a chain of conditions to be evaluated sequentially until a matching condition is found. This enables you to handle different scenarios and execute different code blocks based on different conditions. The elseif statement is a powerful tool for implementing complex decision-making logic in your PHP scripts. Learn more: https://www.php.net/manual/en/control-structures.elseif.php

You are writing a PHP script and you need to add the values of two variables. How would you do this using operators?

  • $sum = $var1 + $var2;
  • $sum = $var1 - $var2;
  • $sum = $var1 * $var2;
  • $sum = $var1 / $var2;
To add the values of two variables in PHP, you would use the + operator. The expression $sum = $var1 + $var2; will add the values of $var1 and $var2 and store the result in the variable $sum. The + operator is the arithmetic addition operator in PHP and is used to perform addition operations on numerical values. Learn more: https://www.php.net/manual/en/language.operators.arithmetic.php

Which of the following functions can be used in PHP to find the length of a string?

  • strlen()
  • count()
  • size()
  • length()
The strlen() function in PHP can be used to find the length of a string. It returns the number of characters in a string. The count() function is used to count the number of elements in an array or an object. The size() and length() functions do not exist in PHP as built-in functions for finding the length of a string. Learn more: https://www.php.net/manual/en/function.strlen.php

The main purpose of a constructor in a PHP class is to initialize the object when it is created.

  • object
  • properties
  • methods
  • variables
The main purpose of a constructor in a PHP class is to initialize the object when it is created. The correct option is "object." The constructor is called automatically when an object is created from the class, allowing you to initialize its properties or perform other setup tasks. For more information, consult the PHP documentation on constructors: http://php.net/manual/en/language.oop5.decon.php

Which of the following are common uses of indexed arrays in PHP?

  • Storing a collection of user input values.
  • Tracking session data for multiple users.
  • Iterating over a list of items.
  • All of the above.
The correct option is 4. Indexed arrays in PHP have several common uses, including storing a collection of user input values, tracking session data for multiple users, and iterating over a list of items. Indexed arrays provide a convenient way to store and retrieve multiple values sequentially. They are often used when the order of elements and easy access by position are important. Learn more: https://www.php.net/manual/en/language.types.array.php#language.types.array.syntax

How can you include a file in PHP?

  • import()
  • include_once()
  • require()
  • attach()
In PHP, you can include a file using the require() statement, which includes and evaluates the specified file during runtime. This allows you to reuse code from other files in your current PHP script.