Combining and Compressing multiple JavaScript files in php

Question

I am working on a PHP app that requires eight javascript files (hello web2.0).

I am wondering what the best way combine and compress all of the files dynamically. A

Answer 1

 function compress($buffer) {
        /* remove comments */
        $buffer = preg_replace("/((?:\/\*(?:[^*]|(?:\*+[^*\/]))*\*+\/)|(?:\/\/.*))/", "", $buffer);
        /* remove tabs, spaces, newlines, etc. */
        $buffer = str_replace(array("\r\n","\r","\t","\n",'  ','    ','     '), '', $buffer);
        /* remove other spaces before/after ) */
        $buffer = preg_replace(array('(( )+\))','(\)( )+)'), ')', $buffer);
        return $buffer;
    }

Source: http://castlesblog.com/2010/august/14/php-javascript-css-minification