How do I make php read and edit php source files?

I know you can use fopen and stuff. But I am making a php file to edit another php file that would be a config file. Such as

$logo = 'img url';

have php read and edit img url to lets say a real image url?

How would I go about doing this?

 

Use some kind of template or check this http://us2.php.net/manual/en/book.tokenizer.php

 

Using fopen and stuff, you can read in the line and then run an str_replace() on it. That should do it

 

you could use something like this (untested):

$source = file_get_contents('source.php');
$source = preg_replace('\$logo = \'[^\']*\';', '$logo = \'new url\';', $source);
file_put_contents('source.php', $source);

PHP: