Question 41698 in PHP Question posted in
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MpdfMpdf LoggerAwareInterface incompatibility with PsrLog in php 8.1.12

I get the following error when trying to use mpdf:

Declaration of MpdfMpdf::setLogger(PsrLogLoggerInterface $logger) 
must be compatible with PsrLogLoggerAwareInterface::setLogger(PsrLogLoggerInterface $logger): void

The most information I can find on the topic is this but I can’t find how to fix it.

There is mention of using the branch php8-support but I tried this and it doesn’t work either.

Has anyone found a work around on this?

I am on php 8.1.12 and using "mpdf/mpdf": "v8.0.13"

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2

Answers


  1. 0

    Versions and branches of mPDF have nothing to do with this.

    mPDF is not compatible with psr/log 3.x because of support of older PHP versions (which do not have return type hints).

    One or more of your dependencies, or yourself, are forcing psr/log library to version 3.x. You can find out which by calling composer why psr/log in the console.

    Downgrade the psr/log library to 2.x – just enter/change "psr/log": "^2.0" line in your composer.json file and run composer update. This should resolve the issue.

    If any of your libraries enforce psr/log 3.x (do not allow lower major versions), the composer update call will fail and you will have to either downgrade or replace these libraries, or not use mPDF.

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  2. 0

    Downgrade psr/log from 3.x is not a good idead and involve security risk. It may create conflict with other packages which require newer psr/log.
    Mpdf v8.0.16 support psr 3.0, install it first.
    Then go to vendor/psr/log/src/LoggerAwareInterface.php

    Change from:

    public function setLogger(LoggerInterface $logger):void;

    Change to:

    public function setLogger(LoggerInterface $logger);

    This change will solve your issue.

    Note:It is only minor change and not having big influence. If you keep on using psr/log v2, you can downgrade and all of your package must use psr/log v2 for consistence. If you want using psr/log v3, making change in vendor folder is the only choice because setlogger in mpdf is not compatible with setlogger in LoggerAwareInterface. It’s common practice that change should not be made in vendor file and keep on using psr/log v2 is better choice.

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