PHP Variables

The Variables are "containers" for storing any information .

Creating And (Declaring) PHP Variables

In PHP, a variable is declared using a dollar $ sign followed by the variable name. Here, some important points to know about variables

<?php
$txt = "Hello Stack !";
$x = 5;
$y = 3.5;
?>

After the execution of the declare variable above, the variable $txt will hold the value Hello Stack !, the variable $x will hold the value 5, and the variable $y will hold the value 3.5.

Rules of PHP variables:

1. The php variable starts with the $ sign, followed by the name of the variable
2. A variable name must start with a letter or the underscore character
3. A variable name cannot start with a number
4. A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _ )
5. A Variable names are case-sensitive ($age and $AGE are two different variables)

php automatically judge what type of store value in a variable like string or number or floating point number