gistfile1.php

<?php

header ("Content-type: text/css");

/* SET: yahoo rss weather feed */
$myWeatherURL = "http://weather.yahooapis.com/forecastrss?p=UKXX0215";
$fh = fopen($myWeatherURL, 'r');

// get the line we're interested in
$currentconditions = -1;
while ($theData = fgets($fh))
{
    $currentconditions =  strpos($theData, "<weather:condition  text=");
    if (strlen($currentconditions) > 0)
    {
        $data = explode("\"", $theData);
        $currentweather = $data[3];
        break; /* no need to look at the rest! */
    }
}
fclose($fh);

switch($currentweather) {
    case 0: /* tornado */
    case 1: /* tropical storm */
    case 2: /* hurricane */
    case 3200: /* not available */
    case -1: /* finding the conditions in the HTML failed... */
    default: /* everything not explicitly listed... */
        $css = "apocalypse.css";
        break;

    case 3: /* severe thunderstorms */
    case 4: /* thunderstorms */
    case 37: /* isolated thunderstorms */
    case 38: /* scattered thunderstorms */
    case 39: /* scattered thunderstorms */
    case 45: /* thundershowers */
    case 48: /* isolated thundershowers */
        $css =  "thunder.css";
        break;

    case 5: /* mixed rain and snow */
    case 6: /* mixed rain and sleet */
    case 7: /* mixed snow and sleet */
    case 8: /* freezing drizzle */
    case 10: /* freezing rain */
    case 17: /* hail */
    case 18: /* sleet */
    case 25: /* cold */
    case 35: /* mixed rain and hail */
        $css =  "cold-sleety-snow.css";
        break;

    case 9:  /* drizzle */
    case 11: /* showers */
    case 12: /* showers */
    case 40: /* scattered showers */
        $css =  "thunder.css";
        break;

    case 13: /* snow flurries */
    case 14: /* light snow showers */
    case 15: /* blowing snow */
    case 16: /* snow */
    case 41: /* heavy snow */
    case 42: /* scattered snow showers */
    case 43: /* heavy snow */
    case 46: /* snow showers */
        $css =  "snow.css";
        break;

    case 19: /* dust */
    case 20: /* foggy */
    case 21: /* haze */
    case 22: /* smoky */
        $css =  "nice-day.css";
        break;

    case 23: /* blustery */
    case 24: /* windy */
        $css = "cloudy-day.css";
        break;

    case 26: /* cloudy */
    case 28: /* mostly cloudy (day) */
    case 30: /* partly cloudy (day) */
    case 44: /* partly cloudy */
        $css = "cloudy-day.css";
        break;

    case 27: /* mostly cloudy (night) */
    case 29: /* partly cloudy (night) */
        $css = "cloudy-day.css";
        break;

    case 32: /* sunny */
    case 34: /* fair (day) */
    case 36: /* hot */
        $css = "nice-day.css";
        break;

    case 31: /* clear (night) */
    case 33: /* fair (night) */
        $css = "nice-night.css";
        break;
}

/* print out the right CSS! */
readfile($css);

?>