A PHP script starts with the <?php and ends with the ?> tag.
<?php // 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"> <head> <meta charset="UTF-8"> <title>Use PHP within HTML</title> </head> <body> <h1> <?php echo "Hello, world!"; ?> </h1> </body> </html>
PHP supports single-line comments and multi-line comments. To write a single-line comment, slashes (//), or a pound sign (#). multi-line comments. / * * /
<?php // 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!"; ?>