List/Categorization
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Membership
Core Extensions
These are not actual extensions. They are part of
the PHP core and cannot be left out of a PHP binary with
compilation options.
Bundled Extensions
These extensions are bundled with PHP.
External Extensions
These extensions are bundled with PHP but in order
to compile them, external libraries will be needed.
PECL Extensions
These extensions are available from » PECL. They may require external
libraries. More PECL extensions exist but they are not documented
in the PHP manual yet.