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psalm/docs/running_psalm/issues/AssignmentToVoid.md

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# AssignmentToVoid
Emitted when assigning from a function that returns `void`:
```php
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<?php
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function foo() : void {}
$a = foo();
```
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## Why this is bad
Though `void`-returning functions are treated by PHP as returning `null` (so this on its own does not lead to runtime errors), `void` is a concept more broadly in programming languages which is not designed for assignment purposes.
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## How to fix
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You should just be able to remove the assignment entirely:
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```php
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<?php
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function foo() : void {}
foo();
```