Function of this particular PHP class - php

Question

I'm new to PHP "class". I'm looking for a script that can help me create PHP templates, I found this one but I can't seem to understand what is happening here. Can anyone please explain in details. I will be very grateful. Thanks..
<?php
class skin {
var $filename;
public function __construct($filename) {
$this->filename = $filename;
}
public function mk($filename) {
$this->filename = $filename;
return $this->make();
}
public function make() {
global $CONF;
$file = sprintf('./'.$CONF['theme_path'].'/'.$CONF['theme_name'].'/html/%s.html', $this->filename);
$fh_skin = fopen($file, 'r');
$skin = #fread($fh_skin, filesize($file));
fclose($fh_skin);
return $this->parse($skin);
}
private function parse($skin) {
global $TMPL, $LNG;
$skin = preg_replace_callback('/{\$lng->(.+?)}/i', create_function('$matches', 'global $LNG; return $LNG[$matches[1]];'), $skin);
$skin = preg_replace_callback('/{\$([a-zA-Z0-9_]+)}/', create_function('$matches', 'global $TMPL; return (isset($TMPL[$matches[1]])?$TMPL[$matches[1]]:"");'), $skin);
return $skin;
}
}
?>

Answer 1

At the beginning of the class __construct() assigns the filename to a variable so to be used everywhere in the class ($filename).
Then there is a function that parse it parse().
But this function is nested into another function for technical purposes. the private keyword before parse() means it could be used by the class itself.
Hence, the function make() is responsible for making use of parse();
A final function mk() calls make().
parse() parses the template. Means it replaces the actual final parsed variables and data with the template special syntax (which you must refer to in your template file).
make() function gets the content of the file and printf() in it generates a usable full URL from the given params to it.