Detailed introduction to cloning method

We already know that when calling an object using a pass-by-reference method, the actual call is the same object. Sometimes it is necessary to create a copy of the object. When changing the original object, we do not want to affect the copy. In PHP, you can use Use the current object to clone an identical object. The cloned copy is completely independent of the original two objects and does not interfere with each other. Let’s take a simple example to see how to use clone: ​​

1. ##Introduction: We have known before that when calling an object using a reference by address, the actual call is the same object. Sometimes it is necessary to create a copy of the object. When changing the original object, we do not want to affect the copy. In PHP, you can clone an identical object based on the current object. The cloned copy is completely independent of the original two objects and does not interfere with each other. Let’s take a simple example to see how to use cloning:

2. Singleton Mode PHP Implementation_PHP Tutorial

Introduction: PHP implementation of singleton mode. The singleton mode ensures that there is only one instance of a class; 1. Static member variables save the only instance of the class 2. Declare the constructor and clone method as private to prevent new instances 3. Provide a

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Introduction: Singleton mode PHP implementation singleton mode ensures that there is only one instance of a certain class; 1. Static member variables save the only instance of the class 2. Declare the constructor and clone method as private to prevent new instances. 3. Provide a public static method to access this instance and return a reference to the unique instance.

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Introduction: singleton mode PHP implements the singleton mode to ensure that there is only one instance of a class; 1. Static member variables save the only instance of the class 2. Declare the constructor and clone method as private to prevent new instances 3. Provide a public static method to access this instance , return the reference of the only instance

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Introduction: PHP implementation of singleton mode. The singleton mode ensures that there is only one instance of a class; 1. Static member variables save the only instance of the class 2. Declare the constructor and clone method as private to prevent new instances 3. Provide a

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Introduction: Problem to be solved: Can we reduce the use of new while avoiding the need to add new objects? time, understand the class name of the object. Idea: php5 provides a cloning method. We can add an object, and then every time we need to add an object of the same type as her, just clone it.

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Introduction: In JS, for object types Variable references are operated through "pointers" like C, and if multiple variables refer to the same object, any operation of one variable on the object will affect other variables.

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