In PHP, the term for the blueprint from which individual objects are created is "Class." A class defines the structure, properties, and methods that an object will have. Objects are instances of a class, and they are created based on the blueprint provided by the class. The other mentioned options (Object, Instance, Prototype) are related to objects but do not specifically refer to the blueprint itself. For further details, refer to the PHP documentation on classes and objects: http://php.net/manual/en/language.oop5.php

To upload a file in PHP, you need to use an HTML form with the enctype attribute set to "multipart/form-data" and an input element of type "file". This allows the browser to send the selected file to the server. On the server side, PHP handles the uploaded file data and provides access to it using the appropriate superglobal array.

To check if the value of a given variable is alphanumeric in PHP, you can use the ctype_alnum() function. The ctype_alnum() function returns true if all characters in the string are alphanumeric (letters or digits), and false otherwise. It can be used to validate user input or check if a variable contains only alphanumeric characters. For example, you can use ctype_alnum($var) to check if the value of $var is alphanumeric. It's important to note that the ctype_alnum() function only works with string values. If you need to check alphanumericity for numeric values, you can use a combination of is_string() and is_numeric() functions.

In PHP, to include a file in your script, you can use the require() statement. This will include and evaluate the specified file during runtime, allowing you to access its content in the current script.

In PHP, the int data type is used to store numeric values without a decimal. It can hold positive and negative whole numbers, including zero. Integers are used to perform mathematical operations and represent whole quantities in PHP. Learn more: https://www.php.net/manual/en/language.types.integer.php

In PHP, a conditional statement is ended with endif when using the alternative syntax for control structures. The alternative syntax provides an alternative way to write control structures such as if, else, while, for, and foreach. Instead of using curly braces {} to enclose the block of code, the alternative syntax uses endif, endwhile, endfor, endforeach, etc. For example, instead of writing if (condition) { code }, you can write if (condition): code endif;. This alternative syntax can be useful for improving readability and reducing visual clutter, especially when working with complex or nested control structures. It's important to note that the alternative syntax is optional, and the regular syntax with curly braces {} is also widely used in PHP.

Form Handling in PHP refers to the technique of processing and managing data submitted through HTML forms. It involves capturing user input, validating and sanitizing the data, and performing necessary actions based on the form data. PHP provides built-in functions and techniques to handle form data effectively, such as accessing form field values using superglobal arrays like $_POST and $_GET, validating inputs, preventing security risks like cross-site scripting (XSS) and SQL injection, and storing or processing the submitted data. Learn more: https://www.php.net/manual/en/tutorial.forms.php

PHP originally stood for "Personal Home Page", but it now stands for "PHP: Hypertext Preprocessor", a recursive backronym. This change reflects the shift in PHP's capabilities from being a simple HTML home page builder to a fully-fledged web scripting language. For more details, visit: https://www.php.net/manual/en/faq.general.php#faq.general.name

This statement is false. In PHP, a number is considered an integer as long as it does not contain a decimal point or an exponential form. The range of the number does not affect its classification as an integer. However, the size of the number may affect its storage and representation in memory. Learn more: https://www.php.net/manual/en/language.types.integer.php

The correct option is 1. The main difference between sort() and rsort() in PHP is the order in which they sort the array. The sort() function arranges the elements of an array in ascending order, while the rsort() function sorts the elements in descending order. Both functions work on indexed arrays, not specifically on associative arrays. Additionally, both sort() and rsort() modify the original array directly, rather than returning a new sorted array. Understanding the difference between these functions is important for selecting the appropriate sorting method based on the desired order of the array elements. Learn more: https://www.php.net/manual/en/function.sort.php, https://www.php.net/manual/en/function.rsort.php