The PHP code used to analyze Yahoo Weather Info failed due to negativeness.

$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;

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

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I have the following code to parse Yahoo weather information:

$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 to modify the parser to use negative degrees?

Thank you.

Make the dash optional:

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

You can see it prints from this demo:

< /p>

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