How to optimize recursive functions to avoid duplicate generation of objects?

Optimization strategy to avoid repeated creation of objects in recursive functions

Recursive functions are very effective when solving specific problems, but frequent creation of objects can lead to performance bottlenecks. This article will explore how to optimize a recursive function to avoid repeated creation of objects, thereby improving efficiency.

Problem description:

The following function is used to obtain information about the superior area of ​​the specified level:

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

Each recursive call will create a new \app\admin\model\area object, causing waste of resources.

Solution: Dependency Injection

The best optimization solution is to use dependency injection. Pass \app\admin\model\area object as a parameter into the function to avoid repeated creation inside the function.

The modified code is as follows:

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

//Usage example:
$areaModel = new \app\admin\model\Area;
$result = get_superior_area($id, $level, $field, $areaModel);

Through dependency injection, the $areaModel object is created outside the function and reused in recursive calls, effectively avoiding repeated creation of objects, thereby improving the performance of the function. This approach reduces the overhead of object creation and improves code efficiency and maintainability.

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