Книга: Fedora™ Unleashed, 2008 edition

Entering and Exiting PHP Mode

Entering and Exiting PHP Mode

Unlike PHP's predecessors, you embed your PHP code inside your HTML as opposed to the other way around. Before PHP, many websites had standard HTML pages for most of their content, linking to Perl CGI pages to do back-end processing when needed. With PHP, all your pages are capable of processing and containing HTML.

Each .php file is processed by PHP that looks for code to execute. PHP considers all the text it finds to be HTML until it finds one of four things:

? <?php

? <?

? <script language="php">

The first option is the preferred method of entering PHP mode because it is guaranteed to work.

After you are in PHP mode, you can exit it by using ?> (for <?php and <?);%> for <%) or </script> (for <script language="php">). This code example demonstrates entering and exiting PHP mode:

In HTML mode
<?php
 echo "In PHP mode";
?>
In HTML mode
In <?php echo "PHP"; ?> mode

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