PHP Data-URI to file
The data URI you have in your example is not a valid PNG image. This will never work and is unrelated to the code, it's related to the data.
Does not apply but might be of interest:
file_put_contents($_POST['logoFilename'], file_get_contents($data));
The idea behind: PHP itself can read the contents of data URIs (data://
) so you don't need to decode it on your own.
Note that the official data URI scheme (ref: The "data" URL scheme RFC 2397) does not include a double slash ("//
") after the colon (":
"). PHP supports with or without the two slashes.
# RFC 2397 conform
$binary = file_get_contents($uri);
# with two slashes
$uriPhp = 'data://' . substr($uri, 5);
$binary = file_get_contents($uriPhp);
A quick look at the PHP manual yields the following:
If you want to save data that is derived from a Javascript
canvas.toDataURL()
function, you have to convert blanks into plusses. If you do not do that, the decoded data is corrupted:$encodedData = str_replace(' ','+',$encodedData); $decodedData = base64_decode($encodedData);