vimeo/psalm
Psalm is a powerful PHP static analysis tool that finds type errors and bugs before runtime. Install via Composer, configure for your codebase, and run it locally or try the live demo at psalm.dev. Docs and integrations available for teams and CI.
Emitted when attempting to access an array offset where Psalm cannot determine the offset type
<?php
echo [1, 2, 3][$GLOBALS['foo']];
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