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psalm/docs/running_psalm/issues/MixedAssignment.md

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# MixedAssignment
Emitted when assigning an unannotated variable to a value for which Psalm
cannot infer a type more specific than `mixed`.
```php
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<?php
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$a = $_GET['foo'];
```
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## How to fix
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The above example can be fixed in a few ways by adding an `assert` call:
```php
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<?php
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$a = $_GET['foo'];
assert(is_string($a));
```
or by adding an explicit cast:
```php
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<?php
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$a = (string) $_GET['foo'];
```
or by adding a docblock
```php
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<?php
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/** @var string */
$a = $_GET['foo'];
```