Class 'QrReader' not found

vendor/endroid/qr-code/src/Writer/PngWriter.php
line 51:
$reader = new QrReader($string, QrReader::SOURCE_TYPE_BLOB);

"Class 'QrReader' not found"

[endroid]

Hi @pouduo what version do you have installed exactly? Can you look at what namespace the PngWriter includes the QrReader from or try the latest version?

"endroid/qr-code": "^2.5",

the PngWriter namespace has included QrReader

$qrCode->setValidateResult(true);，show error “Class 'QrReader' not found”，if true change false it's right。but in my old project，I use like this true。the same version 2.5

[endroid]

@pouduo I see what the issue is. That version requires ^1.0 of khanamiryan/qrcode-detector-decoder while that library had a BC breaking change in 1.0.1 or 1.0.2. I created a fix for this in 2.5.1 so users with the old major version can keep using the library.

[Vormillion]

Hi,

It seems that something wrong is happening during composer require endroid/qrcode:^2.5
It should download version 2.5.1 but it's still downloading 2.5.0 but composer show endroid/qrcode -a shows 2.5.1 available.

[endroid]

Hi @Vormillion thank you. You can try to install while explicitly requiring 2.5.1 and see what the conflicting dependency or requirement is. It is possible that an older version has some unfixed issues but maybe you can try to install a version older than 2.5.0 if you can not upgrade to a later version.

However of course I would always recommend installing 3.x if possible. Good luck!