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20.1.1 by galaxyAbstractor
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<title>Template Parser Class : CodeIgniter User Guide</title>










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<td><h1>CodeIgniter User Guide Version 2.1.3</h1></td>










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<a href="http://codeigniter.com/">CodeIgniter Home</a> &nbsp;&#8250;&nbsp;










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Template Parser Class










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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&nbsp; <input type="text" class="input" style="width:200px;" name="q" id="q" size="31" maxlength="255" value="" />&nbsp;<input type="submit" class="submit" name="sa" value="Go" /></form></td>










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<h1>Template Parser Class</h1>










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<p>The Template Parser Class enables you to parse pseudo-variables contained within your view files. It can parse simple










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variables or variable tag pairs. If you've never used a template engine, pseudo-variables look like this:</p>










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<code>&lt;html&gt;<br />










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&lt;head&gt;<br />










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&lt;title&gt;<kbd>{blog_title}</kbd>&lt;/title&gt;<br />










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&lt;/head&gt;<br />










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&lt;body&gt;<br />










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<br />










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&lt;h3&gt;<kbd>{blog_heading}</kbd>&lt;/h3&gt;<br />










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<br />










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<kbd>{blog_entries}</kbd><br />










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&lt;h5&gt;<kbd>{title}</kbd>&lt;/h5&gt;<br />










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&lt;p&gt;<kbd>{body}</kbd>&lt;/p&gt;<br />










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<kbd>{/blog_entries}</kbd><br />










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&lt;/body&gt;<br />










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&lt;/html&gt;</code>










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<p>These variables are not actual PHP variables, but rather plain text representations that allow you to eliminate










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PHP from your templates (view files).</p>










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<p class="important"><strong>Note:</strong> CodeIgniter does <strong>not</strong> require you to use this class










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since using pure PHP in your view pages lets them run a little faster.  However, some developers prefer to use a template engine if










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they work with designers who they feel would find some confusion working with PHP.</p>










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<p><strong>Also Note:</strong> The Template Parser Class is <strong>not</strong>  a










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full-blown template parsing solution. We've kept it very lean on purpose in order to maintain maximum performance.</p>










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<h2>Initializing the Class</h2>










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<p>Like most other classes in CodeIgniter, the Parser class is initialized in your controller using the <dfn>$this->load->library</dfn> function:</p>










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<code>$this->load->library('parser');</code>










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<p>Once loaded, the Parser library object will be available using: <dfn>$this->parser</dfn></p>










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<p>The following functions are available in this library:</p>










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<h2>$this->parser->parse()</h2>










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<p>This method accepts a template name and data array as input, and it generates a parsed version.  Example:</p>










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<code>$this->load->library('parser');<br />










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<br />










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$data = array(<br />










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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;'blog_title' => 'My Blog Title',<br />










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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;'blog_heading' => 'My Blog Heading'<br />










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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;);<br />










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<br />










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$this->parser->parse('blog_template', $data);</code>










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<p>The first parameter contains the name of the <a href="../general/views.html">view file</a> (in this example the file would be called blog_template.php),










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and the second parameter contains an associative array of data to be replaced in the template.  In the above example, the










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template would contain two variables: {blog_title} and {blog_heading}</p>










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<p>There is no need to "echo" or do something with the data returned by <dfn>$this->parser->parse()</dfn>.  It is automatically










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passed to the output class to be sent to the browser.  However, if you do want the data returned instead of sent to the output class you can










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pass TRUE (boolean) to the third parameter:</p>










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<code>$string = $this->parser->parse('blog_template', $data, TRUE);</code>










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<h2>$this->parser->parse_string()</h2>










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<p>This method works exactly like parse(), only accepts a string as the first parameter in place of a view file.</p>










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<h2>Variable Pairs</h2>










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<p>The above example code allows simple variables to be replaced.  What if you would like an entire block of variables to be










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repeated, with each iteration containing new values?  Consider the template example we showed at the top of the page:</p>










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<code>&lt;html&gt;<br />










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&lt;head&gt;<br />










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&lt;title&gt;<kbd>{blog_title}</kbd>&lt;/title&gt;<br />










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&lt;/head&gt;<br />










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&lt;body&gt;<br />










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<br />










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&lt;h3&gt;<kbd>{blog_heading}</kbd>&lt;/h3&gt;<br />










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<br />










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<kbd>{blog_entries}</kbd><br />










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&lt;h5&gt;<kbd>{title}</kbd>&lt;/h5&gt;<br />










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&lt;p&gt;<kbd>{body}</kbd>&lt;/p&gt;<br />










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<kbd>{/blog_entries}</kbd><br />










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&lt;/body&gt;<br />










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&lt;/html&gt;</code>










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<p>In the above code you'll notice a pair of variables: <kbd>{blog_entries}</kbd> data... <kbd>{/blog_entries}</kbd>.










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In a case like this, the entire chunk of data between these pairs would be repeated multiple times, corresponding










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to the number of rows in a result.</p>










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<p>Parsing variable pairs is done using the identical code shown above to parse single variables,










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except, you will add a multi-dimensional array corresponding to your variable pair data.










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Consider this example:</p>










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<code>$this->load->library('parser');<br />










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<br />










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$data = array(<br />










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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;'blog_title'&nbsp;&nbsp; => 'My Blog Title',<br />










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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;'blog_heading' => 'My Blog Heading',<br />










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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;'blog_entries' => array(<br />










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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;array('title' => 'Title 1', 'body' => 'Body 1'),<br />










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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;array('title' => 'Title 2', 'body' => 'Body 2'),<br />










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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;array('title' => 'Title 3', 'body' => 'Body 3'),<br />










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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;array('title' => 'Title 4', 'body' => 'Body 4'),<br />










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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;array('title' => 'Title 5', 'body' => 'Body 5')<br />










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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)<br />










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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;);<br />










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$this->parser->parse('blog_template', $data);</code>










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<p>If your "pair" data is coming from a database result, which is already a multi-dimensional array, you can simply










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use the database result_array() function:</p>










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<code>










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$query = $this->db->query("SELECT * FROM blog");<br />










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<br />










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$this->load->library('parser');<br />










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<br />










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$data = array(<br />










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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;'blog_title'&nbsp;&nbsp; => 'My Blog Title',<br />










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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;'blog_heading' => 'My Blog Heading',<br />










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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;'blog_entries' => $query->result_array()<br />










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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;);<br />










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$this->parser->parse('blog_template', $data);</code>










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