CSS parser

<?php
    header("Content-Type: text/css; charset=UTF-8");


    function parse_css($name) {
        $css = "";
        $name_arr = array();
        $value_arr = array();
        $file;

        $file=fopen("$name","r") or exit("");
        $constants = array();
        while (!feof($file)) {$css .= fgetc($file);}
        fclose($file);

        //search all declaration
        preg_match_all("/@(\w+).*:[^;]+;/",$css,$constants);

        for($i=0;$i<sizeof($constants[1]);$i++) {//parse declarations
            $splitted = preg_split("/@(\w+).*:(\s)*/",$constants[0][$i]);
            $splitted = preg_split("/;/",$splitted[1]);
            $value_arr[$i] = $splitted[0];
            $name_arr[$i] = $constants[1][$i];
            $splitted = "";
        }

        for($i=0;$i<sizeof($name_arr);$i++) {//remove declarations
            $css=preg_replace('/@'.$name_arr[$i].'(\s)*(:)(\s)*'.$value_arr[$i].'(\s)*(;)/','',$css);
        }

        for($i=0;$i<sizeof($name_arr);$i++) {//replace
            $css=preg_replace('/@'.$name_arr[$i].'/',$value_arr[$i],$css);
        }
        echo $css;
    }

    $files = array_keys($_GET);
    foreach($files as $file) {
        if(preg_match("/(((\\/)?[a-zA-Z0-9_]+)+)(_css)$/",$file)==1) {
            $file=preg_replace("/(_css)/",".css",$file);
            if(file_exists($file)) {
                parse_css($file);
            }
        }
    }




?>