PHP Object-oriented-single-column form

PHP Object-oriented-single-column mode

Singleton mode, in the PHP object-oriented application of a wide range, usually in order to save resources, in terms of performance, code reuse considerations, the use of design patterns is very good choice, such as database Operation class System class library, etc., usually open source code will use a single-column mode to design, the advantages of using single-column mode is obvious, You can guarantee the uniqueness of each class generation entity and improve performance.

 
 
Explanation: As can be seen from the sake, the __construct,__clone of the  constructor is privatized to prevent new and clone an object, and then open getinstace this public operation, allowing its invocation to guarantee the uniqueness of the object.



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