PHP Variables

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 In PHP, a variable starts with the $ sign, followed by the name of the variable:

for example:

<?php
$txt = "Hello RK!";
$x = 5;
$y = 10.5;
?>

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 ($age and $AGE are two different variables)

NOTE:Remember that PHP variable names are case-sensitive!

Output

The PHP echo statement is often used to output data to the screen.

The following example will show how to output text and a variable:

Example 1:

<?php
$txt = "RK";
echo "I love $txt!";
?>


Example 2:

<?php
$txt = "RK";
echo "I love " . $txt . "!";
?>


Example 3:

<?php
$x = 5;
$y = 4;
echo $x + $y;
?>

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