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psalm/docs/running_psalm/issues/ImpureStaticVariable.md
2020-03-20 19:13:56 -04:00

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# ImpureStaticVariable
Emitted when attempting to use a static variable from a function or method marked as pure
```php
<?php
/** @psalm-pure */
function addCumulative(int $left) : int {
/** @var int */
static $i = 0;
$i += $left;
return $left;
}
```