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psalm/docs/running_psalm/issues/PossiblyInvalidArrayAccess.md

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# PossiblyInvalidArrayAccess
Emitted when attempting to access an array offset on a value that may not be an array
```php
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<?php
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$arr = rand(0, 1) ? 5 : [4, 3, 2, 1];
echo $arr[0];
```