PHP View Picture From Base64 String

Question

I am connecting to Active-Directory and getting the thumbnailPhoto attribute successfully.

I have stored the file in the DB using Base64 encoding which makes the result look like:

/9j/4AAQSkZJRgABAQEAYABgAAD/4RHoRXhpZgAATU0AKgAAAAgABQEyAAIAAAAUAA ...

(Full Base64 encoded string: http://pastebin.com/zn2wDEmd)

Using a simple Base64 Decoder and decoding the string into a binary file and rename that to jpeg and open with an image viewer (here: Irfan View) I get the correct picture - see yourself:

How do I achieve this through PHP - I have tried using:

<?php 

$data = '/9j/4A...'; //The entire base64 string - gives an error in dreamweaver

$data = base64_decode($data);

$fileTmp = imagecreatefromstring($data);

$newImage = imagecreatefromjpeg($fileTmp);

if (!$newImage) {
    echo("<img src=".$newImage."/>");
} 

?>

I'm just getting a blank page!

You worry too much: echo '<img src="data:image/jpg;base64,', $base64, '">'; - demo: codepad.viper-7.com/JQ8tyd — hakre
– hakre, Commented Oct 20, 2012 at 15:22

Michael Berkowski · Accepted Answer · 2011-12-01 03:19:29Z

1

Your problem is that imagecreatefromstring() doesn't return a file, but rather an image in memory that should be output with the correct headers.

$data = base64_decode($data);

// Create image resource from your data string
$imgdata = imagecreatefromstring($data);

if ($imgdata) {
  // Send JPEG headers
  header("Content-type: image/jpeg");
  // Output the image data
  imagejpeg($imgdata);

  // Clean up the resource
  imagedestroy($imgdata);
  exit();
}

answered Dec 1, 2011 at 3:19

Michael Berkowski

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4 Comments

yourkishore Over a year ago

here $imgdata is resource can we apply base64_decode to resouce i want it that way.

Michael Berkowski Over a year ago

@yourkishore It isn't clear what you are asking. You have $imgdata as a GD image resource? You cannot base64 encode that directly - you would need to return the binary string from it to encode. Post a question with your specific problem.

yourkishore Over a year ago

Its clarified mate. my question is when imagecopymerge(stuff) will return a resource right ? how do we conver that resource to base64_decode.

Michael Berkowski Over a year ago

Ah, I think you want this then use imagejpeg() (or whatever format) in conjunction with PHP's output buffering to capture the binary string data, then base64_encode() it. There's nothing there to base64_decode() because it hasn't been encoded.

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