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PHP encapsulated mysqli complete class library

Database operation class

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PHP encapsulated mysqli complete class library IntroductionThe mysqli class encapsulated by php, combined with the example form to analyze the definition and usage skills of php for the mysqli operation class,Master the necessary conditions to meet the singleton mode

(1) Private constructor - to prevent using the new keyword to instantiate objects outside the class

(2) Private member attributes-in order to prevent the attributes of storing objects from being introduced outside the class

(3)Private clone method-in order to prevent another object from being cloned outside the class

(4) Public static methods - to allow users to instantiate objects

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