PHP Get current temperature for a zip code

$httpCall = 'www.google.com/ig/api?weather=' . $postal;
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $httpCall);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$output = curl_exec($ch);
curl_close($ch);
	
if (strpos($output, 'problem_cause') === false) {
	$xml = new SimpleXMLElement($output);
	$weather = $xml[0]->weather->current_conditions;
	echo 'Current Temperature: ' . $weather->temp_f;
}