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PHP encapsulates mysql class based on singleton mode

Database operation class

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PHP encapsulates mysql class based on singleton mode

Introduces the MySQL class encapsulated by PHP based on the singleton mode, and analyzes the definition and usage of the MySQL class encapsulated by PHP using the singleton mode in combination with the complete example form

Master the necessary conditions to satisfy the singleton pattern

(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 cloning 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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