What are PHP tags?

• PHP code starts with start tag <?php and end with end tag ?>
• PHP code can also start with short open tag <?  .To use this short tag you have to enable short_open_tag in php configuration file “php.ini”
• Before PHP version 7, PHP  also supported ASP tags <%, %>, ASP short open tag for <%=, and the script tag <script language="php"> which  has been removed from PHP version 7.
• If  a PHP file have only PHP codes inside the file  then it is preferable to omit the PHP closing tag ?> at the end of the a PHP file.
• Example of PHP Tag

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  <?php // Start PHP Tag echo "PHP is easy to learn !!"; echo "PHP code is executed on web server !!"; // End PHP Tag ?>

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  Output of above PHP code:
  
  PHP is easy to learn !!PHP code is executed on web server !!

# Good book on PHP:

PHP for the Web: Visual QuickStart Guide (5th Edition)