So I decided to write a template class in order to get myself going on
learning PHP. Of course I wrote the simplest thing possible:
class Template
{
protected $template;
protected $vars;
public function __construct($template)
{
$this->template = $template;
}
public function __set($name, $value)
{
$this->vars[$name] = $value;
}
public function __get($name)
{
return $this->vars[$name];
}
public function __toString()
{
ob_start();
eval('?>' . $this->template);
return ob_get_clean();
}
}
Which you can use, quite simply like this:
$tpl = new Template(file_get_contents('index.tpl.php'));
$tpl->title = 'Here\'s the title';
$tpl->text = 'Blah blah blah...';
echo $tpl;
I have a few questions though.
- First, I'm storing the template as an actual string, instead of just
a path to a template file, which means I'm using eval() instead of
require() in my __toString(). My thinking was that this would avoid
reading the template file twice in the case that __toString() gets
called multiple times. But will PHP handle this automagically if I do
in fact decide to store a path to a file, and call require() instead?
- Secondly, I noticed that in the constructor, it's not necessary to
initialize $vars to an empty array, and I haven't done so. I guess PHP
automatically initializes it the first time I set one of its elements
to a value. Is this okay, or is there a better way in the name of best
practices?
- Finally, I'd like to be able to limit what things can be accessed
from the scope of the template file. As it stands, if you have a
function named blowUpTheComputer() or a gobal variable called
$dontTouchThis, a template author can easily cause trouble. They can
also access any methods and properties of the Template class. How
would you go about restricting this?
Thanks a lot!
- BW
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