从字符串值运行方法链

Question

I have a question about getting value from running a method from a string. While I am able to handle a single method call from a string I am curious how to call a chain of methods from a string.

For example. $project is an Object.

$method1 = "name";
$project->$method1;  // It shows the valid results 

$method2 = "get()->first()->name";
$project->get()->first()-name; // It shows the valid results
$project->$method2; // get a null result

Please help to find a way to make the $method2 work. And what happen if I have params inside those methods?

The reason here is I have made an array of customized methods. It can be run line by line, but I am thinking of a way to turn them into a loop, so it's more efficient. Put the methods in to a file then get values by looping to them.

Array = ["getvalue1()", "getvalue2()",...."getValuen()->anotherMethod()->value"]

Thanks,

Answer 1

If you want nested try something like this:

private function callMethodChain($model, $methodChain)
{
    return array_reduce(explode('->', $methodChain), function($model, $method) {
        return $model->$method;
    }, $model);
}

This will go through a chain of method calls as your described. If some of the chain (the last piece) is a property I think I once rigged up the following to handle it:

protected function callMethodChain($model, $methodChain)
{
    return array_reduce(explode('->', $methodChain), function($model, $method) {
        try {
            return $model->$method;
        } catch (Exception $e) {
            return $model->$method();
        }
    }, $model);
}

If you want to add params try replacing $model->method with:

call_user_func_array(
        array($project, 'your_method'),
        $params
    );