147 行
5.7 KiB
HTML
147 行
5.7 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<title>Alternate PHP Syntax for View Files : CodeIgniter User Guide</title>
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<style type='text/css' media='all'>@import url('../userguide.css');</style>
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<link rel='stylesheet' type='text/css' media='all' href='../userguide.css' />
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<script type="text/javascript" src="../nav/nav.js"></script>
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<script type="text/javascript" src="../nav/prototype.lite.js"></script>
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<script type="text/javascript" src="../nav/user_guide_menu.js"></script>
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<meta http-equiv='expires' content='-1' />
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<meta http-equiv= 'pragma' content='no-cache' />
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<meta name='robots' content='all' />
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<meta name='author' content='ExpressionEngine Dev Team' />
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<meta name='description' content='CodeIgniter User Guide' />
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</head>
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<body>
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<!-- START NAVIGATION -->
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<div id="nav"><div id="nav_inner"><script type="text/javascript">create_menu('../');</script></div></div>
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<div id="nav2"><a name="top"></a><a href="javascript:void(0);" onclick="myHeight.toggle();"><img src="../images/nav_toggle_darker.jpg" width="154" height="43" border="0" title="Toggle Table of Contents" alt="Toggle Table of Contents" /></a></div>
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<div id="masthead">
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<table cellpadding="0" cellspacing="0" border="0" style="width:100%">
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<tr>
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<td><h1>CodeIgniter User Guide Version 2.0.1</h1></td>
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<td id="breadcrumb_right"><a href="../toc.html">Table of Contents Page</a></td>
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</tr>
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</table>
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</div>
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<!-- END NAVIGATION -->
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<!-- START BREADCRUMB -->
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<table cellpadding="0" cellspacing="0" border="0" style="width:100%">
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<tr>
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<td id="breadcrumb">
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<a href="http://codeigniter.com/">CodeIgniter Home</a> ›
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<a href="../index.html">User Guide Home</a> ›
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Alternate PHP Syntax
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</td>
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<td id="searchbox"><form method="get" action="http://www.google.com/search"><input type="hidden" name="as_sitesearch" id="as_sitesearch" value="codeigniter.com/user_guide/" />Search User Guide <input type="text" class="input" style="width:200px;" name="q" id="q" size="31" maxlength="255" value="" /> <input type="submit" class="submit" name="sa" value="Go" /></form></td>
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</tr>
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</table>
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<!-- END BREADCRUMB -->
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<br clear="all" />
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<!-- START CONTENT -->
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<div id="content">
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<h1>Alternate PHP Syntax for View Files</h1>
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<p>If you do not utilize CodeIgniter's <a href="../libraries/parser.html">template engine</a>, you'll be using pure PHP
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in your View files. To minimize the PHP code in these files, and to make it easier to identify the code blocks it is recommended that you use
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PHPs alternative syntax for control structures and short tag echo statements. If you are not familiar with this syntax, it allows you to eliminate the braces from your code,
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and eliminate "echo" statements.</p>
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<h2>Automatic Short Tag Support</h2>
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<p><strong>Note:</strong> If you find that the syntax described in this page does not work on your server it might
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be that "short tags" are disabled in your PHP ini file. CodeIgniter will optionally rewrite short tags on-the-fly,
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allowing you to use that syntax even if your server doesn't support it. This feature can be enabled in your
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<dfn>config/config.php</dfn> file.</p>
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<p class="important">Please note that if you do use this feature, if PHP errors are encountered
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in your <strong>view files</strong>, the error message and line number will not be accurately shown. Instead, all errors
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will be shown as <kbd>eval()</kbd> errors.</p>
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<h2>Alternative Echos</h2>
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<p>Normally to echo, or print out a variable you would do this:</p>
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<code><?php echo $variable; ?></code>
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<p>With the alternative syntax you can instead do it this way:</p>
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<code><?=$variable?></code>
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<h2>Alternative Control Structures</h2>
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<p>Controls structures, like <var>if</var>, <var>for</var>, <var>foreach</var>, and <var>while</var> can be
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written in a simplified format as well. Here is an example using foreach:</p>
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<code>
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<ul><br />
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<br />
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<var><?php foreach ($todo as $item): ?></var><br />
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<br />
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<li><var><?=$item?></var></li><br />
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<br />
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<var><?php endforeach; ?></var><br />
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<br />
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</ul></code>
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<p>Notice that there are no braces. Instead, the end brace is replaced with <var>endforeach</var>.
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Each of the control structures listed above has a similar closing syntax:
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<var>endif</var>, <var>endfor</var>, <var>endforeach</var>, and <var>endwhile</var></p>
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<p>Also notice that instead of using a semicolon after each structure (except the last one), there is a colon. This is
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important!</p>
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<p>Here is another example, using if/elseif/else. Notice the colons:</p>
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<code><var><?php if ($username == 'sally'): ?></var><br />
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<br />
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<h3>Hi Sally</h3><br />
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<br />
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<var><?php elseif ($username == 'joe'): ?></var><br />
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<br />
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<h3>Hi Joe</h3><br />
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<br />
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<var><?php else: ?></var><br />
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<br />
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<h3>Hi unknown user</h3><br />
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<br />
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<var><?php endif; ?></var></code>
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</div>
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<!-- END CONTENT -->
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<div id="footer">
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<p>
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Previous Topic: <a href="managing_apps.html">Managing Applications</a>
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·
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<a href="#top">Top of Page</a> ·
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<a href="../index.html">User Guide Home</a> ·
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Next Topic: <a href="security.html">Security</a>
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</p>
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<p><a href="http://codeigniter.com">CodeIgniter</a> · Copyright © 2006 - 2011 · <a href="http://ellislab.com/">EllisLab, Inc.</a></p>
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</div>
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</body>
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</html>
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