How to convert base64 encode code to image from android to php

Question

I am writing app services for android app. I am using codeigniter. From android i am getting base64 string. I am trying to convert it to image. They are sending like $_POST[ base64string ] and i am converting like below.

          $data=base64_decode($_POST['signature_image']);

          $im=imagecreatefromstring($data);

          header('Content-Type: image/jpeg');

          imagepng($im,$loc_url.$imagename1);

          imagedestroy($im);

but it is not converting to image.We are using other server and there also we are using same app services. it is working there. I don't know what is the issue. I have tried increasing

  ini_set('post_max_size','250M'); 
  ini_set('upload_max_filesize','200M');

in my controller and model file. But it is not working. Please help me what is the issue and how it is resolve?

What does your data string look like? Does it throw any errors? — Gavin, Apr 21 '20 at 09:08
%2F9j%2F4AAQSkZJRgABAQAAAQABAAD%2F2wBDAAMCAgMCAgMDAwMEAwMEBQgFBQQEBQoHBwYIDAoMDAsK%0ACwsNDhIQDQ4RDgsLEBYQERMUFRUVDA8XGBYUGBIUFRT%2F — Mythili, Apr 21 '20 at 09:42
At a glance it looks like it might need to be urldecoded before base_64 decoding too. — Gavin, Apr 21 '20 at 09:46
You have not told what exactly was base64 encoded on Android side. Saying that it was an image will not do. You have to be specific. And then you should tell us which image firmats are accepted by imagecreatefromstring(). — blackapps, Apr 21 '20 at 11:33
Pretty strange that you use imagecreatefromstring() as Android will not have encoded a string base64. — blackapps, Apr 21 '20 at 11:34

score 0 · Answer 1 · answered Apr 21 '20 at 09:31

0

I think problem is that data:image/png;base64, included into base64 string. you need to 1st remove that and try again like bellow.

    $encoded = explode( ',', $_POST['signature_image'])[0];
    $data= base64_decode($encoded);
    ....

answered Apr 21 '20 at 09:31

Sejal Vadariya

19
5

No it is not contain data:image/png;base64. it is looks like below: – Mythili Apr 21 '20 at 09:43
%2F9j%2F4AAQSkZJRgABAQAAAQABAAD%2F2wBDAAMCAgMCAgMDAwMEAwMEBQgFBQQEBQoHBwYIDAoMDAsK%0ACwsNDhIQDQ4RDgsLEBYQERMUFRUVDA8XGBYUGBIUFRT%2F2wBDAQMEBAUEBQkFBQkUDQsNFBQUFBQU%0AFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBT%2FwAARC – Mythili Apr 21 '20 at 09:44
@Mythili Please refer [link](https://stackoverflow.com/questions/15153776/convert-base64-string-to-an-image-file) may be solve your problem – Sejal Vadariya Apr 21 '20 at 12:08

How to convert base64 encode code to image from android to php

1 Answers1