Template Engine

[Altec]

Hey guys,

 

A couple nights ago I found an article on how to write  template engine in PHP. I followed the tutorial and am using it now in my scripts. However, as my scripts get more advanced, the more I realize I need to understand EXACTLY how the script is working and how to expand upon it.

 

Here is my code:

<?php
class Page {
    var $page;

    function Page($template) {
        if(file_exists($template)) {
            $this->page = join('', file($template));
        }
        else {
            die('Template file ' . $template . ' not found.');
        }
    }

    function parse($file) {
        ob_start();
        include($file);
        $buffer = ob_get_contents();
        ob_end_clean();
        return $buffer;
    }

    function replace_tags($tags = array()) {
        if(sizeof($tags) > 0) {
            foreach ($tags as $tag => $data) {
                $data = (file_exists($data)) ? $this->parse($data) : $data;
                $this->page = eregi_replace('{' . $tag . '}', $data, $this->page);
            }
        }
        else {
            die('No tags designated for replacement.');
        }
    }

    function output() {
        echo $this->page;
    }
}
?>

 

Very very very simple. Obviously the pages can be created by:

<?php
            $page = new Page('templates/index.html');
            $page->replace_tags(array(
                'PAGE_TITLE'    => 'Post New Entry',
                'MENU'          => 'templates/menu.html',
                'TITLE'         => 'Post New Entry',
                'CONTENT'       => 'templates/sys/form.php',
                'SIDEBAR'       => 'templates/sidebar.html',
                'FOOTER'        => 'templates/footer.html',
            ));
            $page->output();
?>

 

However, I have hit a small snag... Can I nest it like so:

 

<?php

$page = new Page('templates/index.html');
$page->replace_tags(array(
    'PAGE_TITLE'    => 'Post New Entry',
    'MENU'          => 'templates/menu.html',
    'TITLE'         => 'Post New Entry',
    'CONTENT'       => $content = new Page('templates/main.html');
                       $content->replace_tags(array(
                            'MAIN'      => 'Hi.',
                       ));
                       $content->output();
                       ,
    'SIDEBAR'       => 'templates/sidebar.html',
    'FOOTER'        => 'templates/footer.html',
));
$page->output();

?>

 

I'm afraid everything will blow up if I try to do that.

 

Also, the tutorial I followed is about four (4) years old; are there any apparent security flaws or updates I can make?

 

Thanks!

[cerian]

i'm not quite sure if that will work, but i have been using the same tutorial as a base and have done the following. i 'm sure there is a better way, but it has worked for me on the small scale.

 

<?php

function there() {
return "there";
}


$content = "hello.";
$content .= "out";
$content .= there();

$page->replacetags( array( 'content' = $content))
$page->output();


?> 

 

hope this helps...