As PHP application become more and more complex, that makes maintenance nearly very hard . One of the main design pattern is MVC (model- view-controller), which helps in separating application logic from view. Typically, the application code contains the business logic of your application, written and maintained in PHP code. This code is maintained by programmers. The presentation is the way your content is presented to the end user, which is written and maintained in template files. The templates are maintained by template designers .

Here I am going to show you how to create  a simple template class , which is hack of logic behind CodeIgniter for fetching a particular view .

---

Our basic template class has the following basic methods.

class Template{

var $tpldir ='templates';

var $data = array();

var $_path ;

function setTplDir ($path ){}

function assign ($key , $val ){}

function fetch ($path ){}

function setTplPath($path){}

function display($path){}

}

---

First we have to set our template directory . ’setdir’ function will set template path , so we can place our templates in that directory.

function setTplDir($path ){
		$this->tpldir = $path ;
}

---

Assign function is used to set template variables . Template variables are passed as a key value pair

function assign ($key , $val ){
		$this->data[$key] = $val;
}

---

Our main template function is ‘fetch’ . setTplPath set the path for template, separated for later addition to folder and relative path checking . After including the template ,its buffered output will be returned.

function fetch ($path ){

		extract($this->data);
		$this->setTplPath($path);
		ob_start();
		include($this->_path);
		$buffer = ob_get_contents();
		@ob_end_clean();
		return $buffer;
}

---

Display function print the output from fetch function .

Template class :

class Template{

	var $tpldir ='templates';

	var $data = array();

	var $_path ;

	function setTplDir($path ){
		$this->tpldir = $path ;
	}

            function assign ($key , $val ){
		$this->data[$key] = $val;
	}

	function fetch ($path ){

		extract($this->data);
		$this->setTplPath($path);
		ob_start();
		include($this->_path);
		$buffer = ob_get_contents();
		@ob_end_clean();
		return $buffer;
	}

	function setTplPath($path){
		$this->_path = $this->tpldir.'/'.$path.'.php';
	}

	function display($path){
		echo $this->fetch($path);
	}
}

---

Example code using our template class . index.php

$tplobj = new Template;
$tplobj->setTplDir('views');

$students = array('raju', 'renjith', 'arun', 'soumya');
$tplobj->assign('students',$students);
$tplobj->display('studlist');

---

View code :

<ul>
		<?php foreach($students as $stud): ?>
			<li>	<?php echo $stud; ?></li>
	<?php endforeach ; ?>
</ul>

This entry was posted on Monday, March 15th, 2010 at 8:40 am and is filed under Risposta. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.