Initial commit for public repo

code/variables.php

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+<?php
+
+// The variable is the basic building block of any programming language.
+// In PHP, all variables start with a dollar sign.
+$greeting;
+
+// To set data in a variable, you put an equals sign after it and some data.
+$greeting = 'Hello World!';
+
+// Once you create a variable, you can use it again in other commands and functions.
+echo $greeting;
+
+// After the dollar sign, a PHP variable must have an alphabetic character or underscore. Also, variables are case sensitive.
+$_var = 'I am a variable with an underscore!';
+$Var = 'I am a variable with a capital letter!';
+$var = 'I am a new variable';
+
+// Variables can hold many different types of data, but there are four simple ones you can try now.
+// An int is a number without a decimal place.
+// A float is a number with a decimal place.
+// A boolean can be two values: true or false.
+// Last, there is a string, a collection of characters.
+$int = 1;
+$float = 100.10;
+$bool = true;
+$string = 'I am a string';
+
+// In other programming languages, you have to write what type of data the variable will contain.
+// PHP keeps it simple by allowing you to put any type of data in a variable, including already used variables.
+$number = 1;
+$number = 'one';