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Has anyone had to make a byte array out of an image url so they can upload it to method using the UpdateFile Call in PHP.  I am running into issues creating the image byte array and was hoping someone else migh have already solved this issue.

I've done it in C#, but not php.

The first thing to do is remove "data:image/jpeg;base64," from the image string. 

Then convert it to a byte array. In C# this looks like : byte[ uploadedImage = Convert.FromBase64String(imageString); I would assume PHP has a similar funtion.

The solution for this ended up being fairly simple. The image data can be fetched using this basic pattern:
$handle = fopen($imageUrl, 'rb');
$imageData = stream_get_contents($handle);
At this point, $imageData can be passed to Method using the MethodAPIUpdateFile SOAP call. However, we ran into a couple of issue which are probably worth noting:
1) The MethodAPIUpdateFile expects a strFileName parameter which isn't mentioned in the API documentation.
2) After some unsuccessful attempts to update a file with improperly formatted data, all subsequent MethodAPIUpdateFile calls which used the same strFileName value failed to update the file with properly formatted data, despite a success response from the SOAP service. Seems like a potential bug with the API, which we circumvented by updating strFileName to a unique value.