Learn PHP basics with hands-on practice in hello world in PHP, variables in PHP, functions in PHP, arrays in PHP, PHP inheritance, PHP exceptions, and more.

This interactive course introduces you to the fundamentals of PHP programming, one of the most widely used languages in web development. Starting with a simple hello world in PHP, you’ll explore the basics, including PHP output, variables in PHP, and PHP data types. You’ll also learn about PHP constants, arithmetic operators, comparison operators, logical operators, and assignment operators.

The course progresses into conditional statements in PHP, PHP switch, and various loops such as PHP for loop, PHP while loop, and more. You will then dive deeper into functions in PHP, understand PHP variable scope, and learn PHP pass by reference or value. Additionally, you’ll gain a working knowledge of strings in PHP, PHP string operations, and handling arrays in PHP, including PHP multidimensional arrays.

In the advanced sections, you’ll explore classes in PHP, inheritance, constructors, and destructors, handling PHP exceptions with PHP throw and catch exceptions.

Learn PHP

# What are Infinite Loops 
One common programming mistake is to create an **infinite** loop. An **infinite** loop refers to a loop, which under certain valid (or at least plausible) input, will never **exit**.

>**Note:** Beginner programmers” should be careful to examine all the *possible* inputs into a *loop* to ensure that for each such set of inputs, there is an **exit** condition that will eventually be reached. 

*Compilers*, *debuggers*, and other *programming tools* can only help the programmer so far in detecting **infinite** loops. 

>**Note:** In the sufficiently general case, it is not possible to automatically detect an infinite loop. This is known as the **halting** problem. 

While the halting problem is not solvable in the fully general case, it is possible to determine whether a loop will **halt** for some *specific* cases.

## Example of Infinite loop

Down below is an example of an *infinite* loop.


This lesson explains how infinite loops might arise in a while loop using an example.

PHP Basics

PHP Variables

PHP Operators

PHP Conditional Statements

PHP Loops

PHP Functions

PHP Strings

PHP Arrays

PHP Assessment 1

PHP Classes

Exception Handling in PHP

PHP Assessment 2

Infinite Loops

What are Infinite Loops #

Example of Infinite loop #