malkafly

php 5.3.3, maybe it’s. I will try to move entire website this weekend to a Azure Web App with php 5.6.

and the line/function (ln 610 to 622) are:

function windows_azure_storage_srcset($sources)
{
    $azure_metadata = get_metadata('post',get_the_ID(),'windows_azure_storage_info');
    if( !empty($azure_metadata) )
    {
        foreach ($sources as &$source) {
[line 616 -->]  $source['url'] = str_replace(wp_upload_dir()['baseurl'], WindowsAzureStorageUtil::getStorageUrlPrefix(), $source['url']);
        }
    }

    return $sources;
}
add_filter('wp_calculate_image_srcset', 'windows_azure_storage_srcset');