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psalm/docs/running_psalm/issues/UnusedClosureParam.md
Bruce Weirdan e496aa406f
Documented using underscore to suppress unused(param/variable) issues (#3580)
Previously it was undocumented, as pointed out in vimeo/psalm#3574
2020-06-13 00:31:37 -04:00

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# UnusedClosureParam
Emitted when `--find-dead-code` is turned on and Psalm cannot find any uses of a particular parameter in a closure.
```php
<?php
$a = function (int $a, int $b) : int {
return $a + 4;
};
/**
* @param callable(int,int):int $c
*/
function foo(callable $c) : int {
return $c(2, 4);
}
```
Can be suppressed by prefixing the parameter name with an underscore:
```php
$f = function (int $_a, int $b) : int {
return $b + 4;
};
```