How to optimize recursive functions through dependency injection to avoid repeated creation of objects?

Improve the efficiency of recursive functions: Avoid repeated creation of objects

Recursive functions are common in programming, but frequent creation of objects can reduce efficiency. This article uses a case to explain how to use dependency injection to optimize recursive functions to avoid repeated creation of objects, thereby improving performance.

Problem: Repeated creation of objects in recursive functions

Suppose we have a function get_superior_area that recursively obtains the information of the superior area of ​​the area:

 function get_superior_area($id, $level, $field = 'id') {
    $area = new \app\admin\model\area; // The object is repeatedly created $result = $area->get($id);
    if ($result['level'] > $level) {
        return get_superior_area($result['pid'], $level, $field);
    } else {
        return $result[$field];
    }
}

Each recursive call creates a new area object, causing waste of resources.

Solution: Dependency Injection

To solve this problem, we can use dependency injection. Dependency injection separates object creation from function logic, improving code flexibility and maintainability.

We pass area object into the function as a parameter to avoid repeated creation inside the function:

 function get_superior_area($id, $level, $field = 'id', $area = null) {
    if ($area === null) {
        $area = new \app\admin\model\Area;
    }
    $result = $area->get($id);
    if ($result['level'] > $level) {
        return get_superior_area($result['pid'], $level, $field, $area); // Multiplex object} else {
        return $result[$field];
    }
}

area object is created on the first call, and the subsequent recursive call reuses the object, significantly reducing the overhead of object creation. This not only improves performance, but also improves the readability and maintainability of the code. With this example, you can better understand and apply the optimization strategy of dependency injection.

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