All PHP code goes between the php tag. It starts with <?php and ends with ?>. 

• The php file default file extension  is “.php”
• File save with .php file extension
• Every PHP statement end with a semicolon (;) 

PHP tag Syntax  given below:

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

Output:

Hello Tutorialsonweb!

Embedding PHP within HTML-

PHP with HTML tag

 <h1><?php echo "Hello, Tutorialsonweb!"; ?></h1>

Output:

Hello, Tutorialsonweb!