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                有個**Databases**類,傳統用法是,哪里需要,哪里`new Databases;`;這樣若**Databases**對象發生了改變,則有實例化**Databases**的地方都要相應改變。 采用工廠模式實現: ~~~ /* *工廠模式 **/ class Factory{ static function createDatabases(){ $Databases = new Databases(); return $Databases; } } ~~~ * * * * * ~~~ //通過工廠方法調用Databases類 \Factory::createDatabases(); ~~~ * * * * * > [success]好處:當我們對象所對應的類的類名發生變化的時候,我們只需要改一下工廠類類里面的實例化方法即可。不需要外部改所有的地方
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