STUBS are normal, syntactically correct PHP files that contain function & class signatures, constant definitions, etc. for all built-in PHP stuff and most standard extensions. Stubs need to include complete PHPDOC, especially proper @return annotations.
An IDE needs them for completion, code inspection, type inference, doc popups, etc. Quality of most of these services depend on the quality of the stubs (basically their PHPDOC @annotations).
Note that the stubs for “non-standard” extensions are provided as is. (Non-Standard extensions are the ones that are not part of PHP Core or are not Bundled/External - see the complete list here.)
The support for such “non-standard” stubs is community-driven, and we only validate their PHPDoc. We do not check whether a stub matches the actual extension or whether the provided descriptions are correct.
TBD: Have a full copy of the .git repo within an IDE and add it to the project as an external library called "PHP Runtime". It should then be easily updatable both ways via normal git methods.
The set of extensions enabled by default in PhpStorm can change anytime without prior notice. To learn how to view the enabled extensions, look here.
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