PHP Basics #4 : Variables

PHP Variables

As with algebra, PHP variables can be used to hold values (x=5) or expressions (z=x+y).

A variable can have a short name (like x and y) or a more descriptive name (age, carname, total_volume).

Rules for PHP variables:

• A variable starts with the $ sign, followed by the name of the variable
• A variable name must start with a letter or the underscore character
• A variable name cannot start with a number
• A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _ )
• Variable names are case sensitive ($y and $Y are two different variables)

PHP Variables demonstration :

<?php

    $a = "John";
    $b = 'Terry';
    $x = 1;
    $y = 5;
    $z = $x + $y ;
    $float = 10.5;



echo $a;
echo '<br />';
echo $z;
echo '<br />';
echo $float;

?>

The output of the above will be:

John
6
10.5

Variables concept is quite easy to understand and If you have any conclusion in it please comment