Question

I have the following code to parse Yahoo Weather Info:

$xml = simplexml_load_file('http://weather.yahooapis.com/forecastrss?w=868274&u=c');
    $weatherInfo = $xml->channel->item->description;
    $imagePattern = '/src="(.*?)"/i';
    preg_match($imagePattern, $weatherInfo, $matches);
    $imageSrc = $matches[1];
    $degreesPattern = '/.*?, (\d+) C/i';
    preg_match($degreesPattern, $weatherInfo, $matches);
    $degrees = $matches[1];
echo $degrees;

How can I modify the parser in order to work for negative degrees?

Thank you.

Answer 1

Make the dash optional:

$degreesPattern = '/.*?, (-?\d+) C/i';
                          ^^

You can see from this demo that it prints:

-1