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35 lines
742 B
Markdown
35 lines
742 B
Markdown
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# UnsupportedReferenceUsage
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Emitted when Psalm encounters a reference that it is not currently able to track (for instance a reference to an array
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offset of an array offset: `$foo = &$bar[$baz[0]]`). When an unsupported reference is encountered, Psalm will issue this
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warning and treat the variable as though it wasn't actually a reference.
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## How to fix
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This can sometimes be fixed by using a temporary variable:
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```php
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<?php
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/** @var non-empty-list<int> */
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$bar = [1, 2, 3];
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/** @var non-empty-list<int> */
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$baz = [1, 2, 3];
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$foo = &$bar[$baz[0]];
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```
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can be turned into
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```php
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<?php
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/** @var non-empty-list<int> */
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$bar = [1, 2, 3];
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/** @var non-empty-list<int> */
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$baz = [1, 2, 3];
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$offset = $baz[0];
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$foo = &$bar[$offset];
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```
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