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 a literal argument is passed where a variable is expected, such as the first argument of strpos, where an explicit $haystack is almost always unintended.
<?php
function foo(string $s) : void {
echo strpos(".", $s);
}
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