Comments and Variables in PHP


Comments:

<?php
    echo 'This is a test'// This is a one-line c++ style comment
    /* This is a multi line comment
       yet another line of comment */
    echo 'This is yet another test';
    echo 'One Final Test'# This is a one-line shell-style comment
?>

Variables:

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

Example:

<?php

$txt = "Hello world!";

$x = 5;

$y = 10.5;

?>

Example Program:

<!DOCTYPE html>
<html><body>
<?php
$txt = "Hello world!";
$x = 5;
$y = 10.5;
echo $txt;
echo "<br>";
echo $x;
echo "<br>";
echo $y;
?>
</body></html>

Output:

Hello world!
5
10.5

PHP Variables

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).

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