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psalm/docs/running_psalm/issues/UnusedForeachValue.md

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# UnusedForeachValue
Emitted when `--find-dead-code` is turned on and Psalm cannot find any
references to the foreach value
```php
<?php
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/** @param array<string, int> $a */
function foo(array $a) : void {
foreach ($a as $key => $value) { // $value is unused
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echo $key;
}
}
```
Can be suppressed by prefixing the variable name with an underscore or naming
it `$_`:
```php
<?php
foreach ([1, 2, 3] as $key => $_val) {}
foreach ([1, 2, 3] as $key => $_) {}
```