In the example below, only the first statement will display the value of the
$color variable (this is because $color, $COLOR, and $coLOR are treated as three
different variables):
Example
<!DOCTYPE html>
<html>
<body>
<?php
$color = "red";
echo "My car is " . $color . "<br>";
echo "My house is " . $COLOR . "<br>";
echo "My boat is " . $coLOR . "<br>";
?>
</body>
</html>
