Declaration of Psr\Log\NullLogger must be compatible with Psr\Log\AbstractLogger

[torbentschechne]

Hello,

I use mPDF in my code to generate PDFs. The server runs PHP 8.0 and suddenly I get this error:

PHP Fatal error: Declaration of Psr\Log\NullLogger::log($level, Stringable|string $message, array $context = []): void must be compatible with Psr\Log\AbstractLogger::log($level, $message, array $context = []) in /files/wp-content/plugins/pdf-creator/includes/vendor/psr/log/src/NullLogger.php on line 26

The weird thing is, the files look okay. The NullLogger and the LoggerTrait have the same signature.

LoggerTrait (which feeds the AbstractLogger):

abstract public function log($level, string|\Stringable $message, array $context = []): void;

NullLogger:

    public function log($level, string|\Stringable $message, array $context = []): void
    {
        // noop
    }

I updated from mPDF 8.1.* to mPDF 8.2.2. I switched from psr/log 2 to psr/log 3. But still when using 8.2.2 and/or psr/log in Version 2 or 3, I get the error mentioned above. So I wonder, where is this error/the wrong signature coming from?

I also checked the server, but nothing regarding this is installed in my php installation:

sudo dpkg --get-selections | grep php
php-common					install
php8.0-bcmath					install
php8.0-cli					install
php8.0-common					install
php8.0-curl					install
php8.0-fpm					install
php8.0-gd					install
php8.0-igbinary					install
php8.0-imagick					install
php8.0-intl					install
php8.0-mbstring					install
php8.0-mysql					install
php8.0-opcache					install
php8.0-readline					install
php8.0-redis					install
php8.0-soap					install
php8.0-xml					install
php8.0-zip					install

Can anybody tell me what's going on and how I can fix it?

[finwe]

Post your composer info mpdf/* and composer info psr/* output.

[finwe]

This seems OK. Can you try deleting the vendor directory and running composer install?

[finwe]

Are you running fpm? Can you try reloading it or restarting the server? There might be some cache.

[torbentschechne]

Yes, fpm is running. I restartet fpm, nginx and the whole server. No success :/

[finwe]

I'm out of ideas.

[torbentschechne]

Whats really odd, I did this as explained here:

https://stackoverflow.com/a/76243472/1124269

So my composer.json looks like this:

{
    "require": {
        "mpdf/mpdf": "~8.2",
        "psr/log": "^1.1"
    }
}

And now it works...

[khanhvo]

Hi there,

I am facing this issue on both PHP 8.0 and PHP 8.2. Any advice, please?

My packages:
Package operations: 8 installs, 0 updates, 0 removals

• Downloading paragonie/random_compat (v9.99.100)
• Installing setasign/fpdi (v2.6.0): Extracting archive
• Installing psr/log (3.0.0): Extracting archive
• Installing psr/http-message (2.0): Extracting archive
• Installing paragonie/random_compat (v9.99.100): Extracting archive
• Installing myclabs/deep-copy (1.11.1): Extracting archive
• Installing mpdf/psr-log-aware-trait (v3.0.0): Extracting archive
• Installing mpdf/psr-http-message-shim (v2.0.1): Extracting archive
• Installing mpdf/mpdf (v8.2.3): Extracting archive