imagecreatefromstring函数的问题

Question

I am trying to convert a string to an image using the "imagecreatefromstring" function (I've attached the code below). It works for most images, but when I try to convert larger images, a small portion of the image does not get converted (the lower part of the image is just grey)

my code is (take it from php.net example) :

            $data = base64_decode($record['text']);

            $im = imagecreatefromstring($data);
            if ($im !== false) {
                header('Content-Type: image/jpeg');
                imagejpeg($im);
                imagedestroy($im);
            }

i also try different way to decode the string not in one pice , but splitting the string and then decode it.

 for($i=0, $len=strlen($record['text']); $i<$len; $i+=4){
                $data.= base64_decode( substr($record['text'], $i, 4) );
            }

Answer 1

It sounds like your data has been truncated, either on storage or on retrieval. Verify that you have the entire image in your store.