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psalm/docs/running_psalm/issues/UnusedParam.md

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# UnusedParam
Emitted when `--find-dead-code` is turned on and Psalm cannot find any uses of a particular parameter in a private method or function
```php
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<?php
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function foo(int $a, int $b) : int {
return $a + 4;
}
```
Can be suppressed by prefixing the parameter name with an underscore:
```php
function foo(int $_a, int $b) : int {
return $b + 4;
}
```