Combine and minify .js in php

minified.js.php

<?php 
header('Content-type: text/javascript');
ob_start("compress");

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

        /* remove other spaces before/after ) */
        $minify = preg_replace(array('(( )+\))','(\)( )+)'), ')', $minify);
    		
        return $minify;
    }

    /* Js files for combining */
    include('custom.js');
    include('custom2.js');    

ob_end_flush();