phpqrcode库将图像作为字符串返回

Question

http://sourceforge.net/projects/phpqrcode/ , is a great library but i can't find how to return the png image as a string , the basic examples are

QRcode::png('code data text', 'filename.png'); // creates file 
QRcode::png('some othertext 1234'); // creates code image and outputs it directly into browser

i checked the documentation and nothing, help! :B

Answer 1

ob_start();
QRCode::png('text', null);
$imageString = base64_encode( ob_get_contents() );
ob_end_clean();

Answer 2

$qrTempDir = 'path/to/your/temp';
$filePath = $qrTempDir.'/'.uniqid();

QRcode::png('some text', $filePath);
$qrImage = file_get_contents($filePath);

unlink($filePath);

This should be what you're looking for. You can extend it to show an image like that:

<img src="data:image/png;base64,<?php echo base64_encode($qrImage) ?>" />

Unfortunately, the library does not support any other method at the moment, because calling the QRcode::png function without the file parameter not only makes it send those headers, but it also exits the code execution, so there is no retracting or overwriting the headers.

Answer 3

I ran into the same problem as @iim.hlk

This is what i did slightly modified @Lusitanian his answer to this

ob_start();
QRCode::png($string);
$imageString = base64_encode( ob_get_clean() );
header('Content-Type: text/html');

This fixes the header issue by simply overwriting it. Not clean or anything but it works for the purpose.

Answer 4

this works for me

include '../phpqrcode/qrlib.php';
$content = "any content";
ob_start();
QRcode::png($content);
$result_qr_content_in_png = ob_get_contents();
ob_end_clean();
// PHPQRCode change the content-type into image/png... we change it again into html
header("Content-type: text/html");
$result_qr_content_in_base64 =  base64_encode($result_qr_content_in_png);

then in your html file

<img src="data:image/jpeg;base64,$result_qr_content_in_base64'"/>