Shulou(Shulou.com)06/01 Report--

This article mainly explains "how to use PHP virtual destructor". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow Xiaobian's train of thought to study and learn how to use PHP virtual destructor.

Preliminary knowledge

An example is used to illustrate the necessity of virtual analytic function. In listing 1, the constructor of the base class A dynamically allocates 5 bytes, and its destructor is responsible for freeing this memory. The constructor of the derived class Z dynamically allocates 5000 bytes, and its destructor is responsible for releasing this piece of memory.

Program listing 1#include using namespace std;class A {/ / base class public: a () {cout

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