For interfaces and abstract methods it is generally a good practice to add a @return annotation even if it is just @return void or @return null, so that implementors know what to do in the overridden method.
For interface and abstract methods, it is impossible to infer the return type
from the immediate code. In these cases, it is generally advisible to explicitly
annotate these methods with a @return doc comment to communicate to implementors
of these methods what they are expected to return.
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/**
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* @param callable $fn
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*
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* @return CollectionInterface
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*/
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public function filter(callable $fn);
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/**
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* @param callable $fn
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*
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* @return mixed[]
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*/
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public function map(callable $fn);
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/**
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* @param callable $fn
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* @param mixed $initial
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*
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* @return mixed
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*/
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public function reduce(callable $fn, $initial = null);
graze /
data-structure
For interface and abstract methods, it is impossible to infer the return type from the immediate code. In these cases, it is generally advisible to explicitly annotate these methods with a
@returndoc comment to communicate to implementors of these methods what they are expected to return.