It seems like callback() must be provided by classes using this trait. How about adding it as abstract method to this trait?
(
Ignorable by Annotation
)
If this is a false-positive, you can also ignore this issue in your code via the ignore-call annotation
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if (is_callable($callback)) $this->/** @scrutinizer ignore-call */ callback();
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}
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/**
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* @param array|iterable $list
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* @param callable|null $callback
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* @return \Generator
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*/
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public function yieldKeyVal($list, $callback = null)