>

There are four ways of escaping from HTML and entering "PHP code mode":
Example 4-1. Ways of escaping from HTML

   1: <? echo ("this is the simplest, an SGML processing instruction\n"); ?>

   2: <?php echo("if you want to serve XML documents, do like this\n"); ?>

   3: <script language="php">

   4: echo ("some editors (like FrontPage) don’t

   5: like processing instructions");

   6: </script>

   7: <% echo ("You may optionally use ASP-style tags"); %>

   8: <%= $variable; # This is a shortcut for "<%echo .." %>

The first way is only available if short tags have been enabled (either by calling short_tags, they are
configured on using the short_tags run-time configuration setting, or they are enabled using the
–enable-short-tags compile-time configuration setting.
The fourth way is only available if ASP-style tags have been enabled using either the asp_tags
configuration setting or the –enable-asp-tags compile-time configuration setting.
Note: Support for ASP-style tags was added in 3.0.4.
The closing "bracket" for the block will include the immediately trailing newline if one is present.