<html>
    <body>
        
        The square of 7 is:
        
        <?php
        
            
/*
             * Example 2: Basic syntax
             * file: 02-syntax.php
             */

            
$number 7;
            
            echo 
square($number);
            
            function 
square($num) {
                return 
$num $num;
            }
            
        
?>
        
    </body>
</html>