php - 对象构造函数的计数参数（外部方法）

Question

我编写了一个自动加载类的代码，我遇到了一个我认为是因为弱实现/设计类型的问题。我想要做的是计算对象（外部）的默认参数。我可以计算传递给构造函数的参数的数量，但我需要检查内部对象构造函数，并且该方法对我没有帮助。

代码示例：

// This is simple
function test($arg1,$arg2,$arg3) {return func_num_args();}
// How can I count like this?
class load
{
    public function __construct($id="",$path="") {}
}
$l = new load();
// How to count object default parameters count(object($l)), I need answer to be 2`

我需要使用此方法的代码：

[文件：global_cfg.php]

<?php
// File: global_cfg.php
define(ROOT, __DIR__);    // Root directory
define(DEBUG, true);      // Set debugging state ON or OFF
define(MODE, "producer"); // If debug mode is ON: producer, publisher, tester

/*
 * PATH CONFIGURATIONS:
 */

define(DS, "/");
define(LIB, "library");        

/*
 * SIGN AUTOLOAD CLASSES:
 * Setting class sign to true value, the autoloader will create automatically
 * an instance of the class lowercase type.
 */

$signClasses = Array
(
    "Ralor"    => false,
    "NaNExist" => true,
    "Message"  => array(MODE),
    "Debug"    => DEBUG,
    "Resource" => true,
    "View"     => true
);

[文件：autoload_classes.php]

<?php
// File: autoload_classes.php
require_once("global_cfg.php");
print "<b>Loaded classes:</b> <br>";
function __autoloadClasses($list, $suffix="class", $extension="php")
{
    $path="";
    foreach($list as $fileName => $classInstance)
    {
        $path = ROOT.DS.LIB.DS.$fileName.".".$suffix.".".$extension; 
        if(!file_exists($path))
        {
            print "Signed class ".$fileName." does not exist!<br>";
            continue;
    }
        require_once($path);
        print $path;
        if($classInstance)
        {
            $GLOBALS[strtolower($fileName)] = new $fileName();
            // ??? todo: counting default object parameters 
            $count = count(get_object_vars($GLOBALS[strtolower($fileName)]));
            if(is_array($classInstance))
            {
                if($count<count($classInstance))
                {
                    print "Arguments passed to object exceeds the limit";
                }
                else if($count>count($classInstance))
                {
                    print "Insuficient arguments passed to the object!";
                }
                else
                {
                    // todo: create object and pass parameters
                    $GLOBALS[strtolower($fileName)] = new $fileName(/*$arg1 .. $argn*/);    
                }
            }
            print $count." -> Class was instantiated!<br>";
            continue;
        }
        print "<br>";
    }
}__autoloadClasses($signClasses);

在这个问题之后，我可以完成我的引导程序。

Answer 1

您可以使用ReflectionFunctionAbstract::getNumberOfParameters。例如。

class load
    {

    public function __construct($id = "", $path = "")
        {

        }

    }

function getNumberOfParameters($class_name)
    {
    $class_reflection = new ReflectionClass($class_name);
    $constructor = $class_reflection->getConstructor();
    if ($constructor === null)
        return 0;
    else
        return $constructor->getNumberOfParameters();
    }

var_dump(getNumberOfParameters('load'));