Error: Command failed: php phpcs.phar --report=checkstyle --standard=phpcs.xml test/error_log_mock.php

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2, tinovyatkin/action-php-codesniffer@v1. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

A file should declare new symbols (classes, functions, constants, etc.) and cause no other side effects, or it should execute logic with side effects, but should not do both. The first symbol is defined on line 8 and the first side effect is on line 6.