php下重载函数的方法

由于PHP是弱类型语言，因此函数的输入参数类型无法确定（可以使用类型暗示，但是类型暗示无法用在诸如整型、字符串之类的标量类型上），并且对于一个函数，比如只定义了3个输入参数，PHP却在运行调用的时候输入4个或者更多的参数。因此基于这2点，注定了PHP中无法重载函数（类似Javascript语言），也无法有构造函数的重载。

由于实现函数的重载对提高开发效率很有帮助，如果能象C#或者C++那样就非常好了。事实上，PHP的确提供了一个魔术方法，`mixed __call(string name, array arguments)`。这个方法在php手册中也有提及，根据官方文档，称此方法可以实现函数重载。当调用对象中一个不存在的方法的时候，如果定义了__call()方法，则会调用该方法。比如下面的代码：
```php
<?php
class A
{
     function __call($name, $args)
    {
        if ($name == 'f')
        {
            $i = count($args);
            if (method_exists($this, $f = 'f' . $i)) {
                call_user_func_array(array($this, $f), $args);
            }
        }
    }
    function f1($a1)
    {
        echo "1个参数" . $a1 . "<br/>";
    }
    function f2($a1, $a2)
    {
        echo "2个参数" . $a1 . "," . $a2 . "<br/>";
    }
    function f3($a1, $a2, $a3)
    {
          echo "3个参数" . $a1 . "," . $a2 . "," . $a3 . "<br/>";
    }
}
(new A)->f('a');
(new A)->f('a', 'b');
(new A)->f('a', 'b', 'c');
?>
```
另外，构造函数中获取参数可以这样写：
```php
$a = func_get_args(); // 获取构造函数中的参数
$i = count($a);
```

data.update.lastsys.time.agopunc.commaarticle.create.bypunc.commaarticle.file.inpunc.colonPHP

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