A PHP script starts with the <?php and ends with the ?> tag.

// Some code to be executed
echo "Hello, world!";

Every PHP statement end with a semicolon (;) — this tells the PHP engine that the end of the current statement has been ended.

Use PHP within HTML

PHP files are plain text files with .php extension. Inside a PHP file, you can write HTML as you do in regular HTML pages as well as embed PHP codes for server-side execution.

<!DOCTYPE html>
<html lang="en">
        <meta charset="UTF-8">
        <title>Use PHP within HTML</title>
            <?php echo "Hello, world!"; ?>

PHP Comments

PHP supports single-line comments and multi-line comments. To write a single-line comment, slashes (//), or a pound sign (#). multi-line comments. / * * /



// This is a single line comment
# This is also a single line comment
echo "Hello, world!";

  This is a multiple line comment 
 * that is more than one line
echo "Hello, world!";