This article will implement a simple container class
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five , Play with your own container class
At this time we modify the Person file
Add a constructor and assign the parameters using the constructor. In the buy method, there is no need to pass parameters, just use this->obj.
If you still run the dependency route directly at this time, the following error will be reported. That is because the constructor in Person has a parameter, but we did not pass it.
At this point, you need to modify one thing, which is to pass the Car instance as a parameter when instantiating the Person. There will be no problem.
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But you will find out what code is above. What was originally a simple few lines of code has become complicated like this. , this time has already done more harm than good. No matter how good the design pattern is, blind use is also a burden to the project.
So this is when reflection comes. Reflection is briefly introduced above, so be sure to read it! The articles are all linked together.
Reflection Battle Optimization Code
The final optimized code is like this. Next, we will briefly analyze this code.
Based on the previous code, only the get method in kaka/container/Container.php was modified
Determine whether the named person is in the container
Use the reflection interface, and then get the constructor of the person class passed in
If person is not The constructor method can directly return the instance of person
If person is stored in the constructor, get the method of person constructor
Because person The parameters of the constructor in the class are not limited to one
, so you need to loop to get the object of each parameter
Finally use reflection The newInstanceArgs interface creates the corresponding instance
Fileapplication/index/controller/Container.phpHere are the changes after the modification
Question 1: kaka/container/dependency/Person.phpWhat does the parameter Car inside mean?
This question is actually very simple, you can see This Car is the Car.php file in the same directory. You can directly understand it as files under the same namespace.
Question 2: Fileapplication/index/controller/Container.phpWhy can you call the buy method directly
First look at the value of obj, The Car class has already been instantiated in the returned object, so there is no need to instantiate it. You can call the buy method directly because the parameters will be passed directly.
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The above is a simple container implemented by Kaka. If you don’t understand or have any questions, you can reply directly in the comment area.
The next step is to analyze the containers in the framework and trace them back to the root cause step by step.
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If you still run the 
At this point, you need to modify one thing, which is to pass the Car instance as a parameter when instantiating the Person. There will be no problem. 
File
The above is a simple container implemented by Kaka. If you don’t understand or have any questions, you can reply directly in the comment area. 
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