PHP Case Sensitivity - Color World

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PHP Case Sensitivity - Color World

My car is red
My house is
My boat is

<?php
$color = "red";
echo "My car is " . $color . "<br>";
echo "My house is " . $COLOR . "<br>";
echo "My boat is " . $coLOR . "<br>";
?>

In PHP, keywords (e.g. if, else, while, echo, etc.), classes, functions, and user-defined functions are not case-sensitive. Note: However; all variable names are case-sensitive!