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31 lines
393 B
Markdown
31 lines
393 B
Markdown
# ImpureByReferenceAssignment
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Emitted when assigning a passed-by-reference variable inside a function or method marked as mutation-free.
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```php
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<?php
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/**
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* @psalm-pure
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*/
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function foo(string &$a): string {
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$a = "B";
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return $a;
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}
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```
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## How to fix
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Just remove the mutating assignment:
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```php
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<?php
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/**
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* @psalm-pure
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*/
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function foo(string &$a): string {
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return $a;
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}
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```
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