Create/display image from dataURL - php

Question

is it possible to create and display a picture file from dataURL received by POST?
Something like:
<?
$imgstr = $_POST["imgdata"]; //data:image/png;base64,.... etc (it's always PNG)
echo base64_decode($imgstr); // idk what this really does
?>
I can't use <img> tag to display it. It needs to act like a "normal" image file.

Answer 1

Yes, try:
<img alt="Base64 Image" src="data:image/png;base64,{$imgstr}" />
Edit: make sure you clean up your $_POST, so people do not insert dangerous junk...

Answer 2

If e.g. your input is
// Red dot graphic, stolen from Wikipedia
$imgstr = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg==';
Then you can do what you want with
// Grab the MIME type and the data with a regex for convenience
if (!preg_match('/data:([^;]*);base64,(.*)/', $imgstr, $matches)) {
die("error");
}
// Decode the data
$content = base64_decode($matches[2]);
// Output the correct HTTP headers (may add more if you require them)
header('Content-Type: '.$matches[1]);
header('Content-Length: '.strlen($content));
// Output the actual image data
echo $content;
die;

Answer 3

You must set correct header before echo.
header( 'Content-Type: image/jpeg' );