Write text to the output using PHP

                    
<?php
    echo "Hello World!";
?> 
                    
                

Keywords, classes, functions, and user-defined functions ARE NOT case-sensitive

                    
<?php
    ECHO "Hello World!<br>";
    echo "Hello World!<br>";
    EcHo "Hello World!<br>";
?> 
                    
                

Variable names ARE case-sensitive

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