PHP PHP 3

Question 1

Which PHP keyword is used to refer to the current object inside a class method?

Accepted Answer

$this

Answer

$this is the pseudo-variable used inside a class method to refer to the calling object instance.

Question 2

What is the purpose of PHP's PDO extension?

Accepted Answer

To provide a database-agnostic interface for data access

Answer

PDO (PHP Data Objects) provides a consistent interface for accessing multiple database types using the same API.

Question 3

Which PHP function converts a string to all uppercase letters?

Accepted Answer

strtoupper()

Answer

strtoupper() converts all alphabetic characters in a string to uppercase.

Question 4

What does the PHP function array_merge() do when two arrays have the same string key?

Accepted Answer

Overwrites with the second array's value

Answer

When string keys conflict during array_merge(), the second array's value overwrites the first; numeric keys are renumbered.

Question 5

Which of the following correctly defines an abstract class in PHP?

Accepted Answer

abstract class MyClass {}

Answer

The abstract keyword placed before class declares an abstract class that cannot be instantiated directly.

PHP - PHP Programming Language Practice Test