PHP Variables

What is PHP variables:
PHP variables are used to store and retrieve some data.

How to write PHP Variables

• All variables must start with a dollar sign $
• The name of the variable can consist of letters and numbers and special characters like underscore ‘_’, But must begin with a letter.

PHP variables are case sensitive $name is not the same as $NAME
Examples of PHP Variables

$sitename = '52webdesign.com'; // valid variable
$4sitname = '52webdesign.com'; // invalid variable since it starts with a number
$_4site = '52webdesign.com'; // valid variable since it starts with a special character under score.

More Examples of PHP Variables

$testvariable = 4 + 1; // Assigns a value of 5.
$testvariable = 4 – 1; // Assigns a value of 3.
$testvariable = 4 * 2; // Assigns a value of 8.
$testvariable = 4 / 2; // Assigns a value of 2.

Another Examples of PHP Variables

<?php
$a = 2;  //we created a variable a and assigned it a value of 2
$b = 7;  //we created a variable b and assigned it a value of 7
$c = $a * $b;  //we multiply varaible a and b and store the value in c
echo $c;  //we print the content of variable c which is 14
?>

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