Use current forecast for dynamic OG image

[busbyk]

When any of the forecasts links are shared - they should use a dynamic OG image that checks the forecast from the AFP apis.

[andyanderso]

Here is my script:
'<?php

$json_url='https://api.avalanche.org/v2/public/products/map-layer/SAC';

$json = file_get_contents($json_url,0,null,null);

$json_output = json_decode($json, JSON_PRETTY_PRINT);

$danger_rating =$json_output['features'][0]['properties']['danger_level'];
print 'sites/all/themes/responsive_sac/img/rating-icons/200fb'.$danger_rating.'.png';
?>
'