mirror of
https://github.com/danog/psalm.git
synced 2024-12-02 09:37:59 +01:00
27 lines
464 B
Markdown
27 lines
464 B
Markdown
# 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;
|
|
};
|
|
```
|