function get_weather old FALSE cache_file dirname __FILE__ cache weath

function get_weather() {
    $old = FALSE;
    $cache_file = dirname(__FILE__) . '/cache/weather.ce';
    if (file_exists($cache_file)) {
        $cache_data = file_get_contents($cache_file);
        $cache_data = unserialize($cache_data);
        if ($cache_data[0] < time() - 3600) {
            $old = TRUE;
            echo "Get new data";
        } else {
            $temp = $cache_data[1];
            echo "From Cache";
        }
    } else {
        $old = TRUE;
    }

    if ($old) {
        $oCurl = curl_init("http://point.md/Weather/Default.aspx");
        curl_setopt($oCurl, CURLOPT_HEADER, 0);
        curl_setopt($oCurl, CURLOPT_RETURNTRANSFER, 1);
        $page = curl_exec($oCurl);
        curl_close($oCurl);
        $mix = '<a href="/Weather/CurrentTemperature/Default.aspx" class="green">';
        $pos = strpos($page, $mix);
        $page = substr($page, $pos + strlen($mix));
        if (!$pos) {
            $mix = '<a href="/Weather/CurrentTemperature/Default.aspx" class="blue">';
            $pos = strpos($page, $mix);
            $page = substr($page, $pos + strlen($mix));
            if (!$pos) {
                return "*°C";
            }
        }
        $mix = '</a>';
        $pos = strpos($page, $mix);
        $temp = substr($page, 0, $pos);
        
        # write to cache
        $f = fopen($cache_file, 'w+');
        flock($f, LOCK_EX);
        $cache_data = array(time(), $temp);
        fwrite($f, serialize($cache_data));
        flock($f, LOCK_UN);
        fclose($f);
    }
    return $temp;
}