php - What is the mean of zendframework suggests installing -

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i install zend skeleton application this link, install via composer. composer notice:

zendframework/zendframework suggests installing ext-intl (ext/intl i18n features (included in default builds of php)) zendframework/zendframework suggests installing doctrine/annotations (doctrine annotations >=1.0 annotation features) zendframework/zendframework suggests installing ircmaxell/random-lib (fallback random byte generator zend\math\rand if openssl/mcrypt extensions unavail able) zendframework/zendframework suggests installing ocramius/proxy-manager (proxymanager handle lazy initialization of services) zendframework/zendframework suggests installing zendframework/zendpdf (zendpdf creating pdf representations of barcodes) zendframework/zendframework suggests installing zendframework/zendservice-recaptcha (zendservice\recaptcha rendering recaptchas in zend\captcha and/or zend\form)

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please explain me above notice (it says suggests installing). thank you!

if want use optional features, have install 1 of these packages well.

it's kind of advertising other packages may make sense use, not needed.

note in zend framework 2, though composer being used, packages need suggestions installed if don't use zendframework/zendframework main package - developers in process of better modularizing packages.


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