******** W3Schools的PHP Fullversion（离线）**********
W3Schools PHP Fullversion(OFFLINE)
This App Coverd All PHP Tutorials Topics Listed Here
->Installation
->Syntax
->Variables
->Echo
->DataTypes
->Strings
->Constants
->Operators
->IF-Else
->Switch Statement
->WhileLoops
->ForLoops
->Functions
->Arrays
->Sorting Arrays
->Global Variables
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