iOS base64 encoding -> php decoding -

good afternoon stack overflow

i have issue posting image ios device php-webserver using base64 encoding.

i have converted uiimage string in xcode using;

nsstring *imagestring = [uiimagepngrepresentation(attachmentimage) base64encodedstringwithoptions:0]; 

fired on server using http post, fine have echo-ed same string , have seen working.

and server-side decoding using;

$decoded = base64_decode($base64string); file_put_contents($targetfile, $decoded); 

the smug android guy sitting next me has put version of app , works fine using php script containing above code.

although knowledge of base64 limited, have checked 2 non alpha numeric characters used encoding standard ('+','/') , mentioned earlier have checked communication between app/server - fine.

right thinking there maybe problem converting uiimage png have searched points me @ commands im using.

i have been on day , quick running out of hair pull out - appreciated.

thanks in advance