Following instruction on this page I installed PHP using command:
yum install -y php56w
My question is: what does the 'w' stand for in php56w?
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The tutorial has you download PHP from a third party repository named webtatic.
The operator of this repro has compiled the source tarballs of various versions of PHP that are not in the official CentOS repository.
Presumably the 'w' stands for 'webtatic', to differentiate these packages from the official CentOS ones.