Php object-oriented OOP-idea process of automatic class loading

: This article mainly introduces the idea process of php object-oriented OOP-class automatic loading. if you are interested in PHP tutorials, please refer to it. At the beginning, when we use one or more classes, we generally need to use the require or include function to introduce the class before using it;

However, when there are many classes in a project, we must introduce all these classes in a file when we use these classes.

On the one hand, it is cumbersome and inefficient. On the other hand, when we delete some of the classes, we need to delete the corresponding require or include

Statement, which is prone to errors;

In order to avoid the above situation, we used the php magic function _ autoload () to avoid the previous class introduction,

But new problems have emerged. When a project uses multiple frameworks, if each framework uses the _ autoload () function,

Then there will be a fatal error of repeated function definitions;

To solve this problem, the SQL _autoload_register () function is available in php5.3 and later versions. you can use this function on your own.

Registering a custom autoload function solves the problem of repeated function definitions;

Therefore, we often use the SQL _autoload_register () function to automatically load classes;

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The above introduces the idea of php object-oriented OOP-class automatic loading, including some content, and hopes to be helpful to friends who are interested in PHP tutorials.