学习PHP之动态实例化类

<?php        class Test1{            public function __construct(){                    echo "Test1<br>";                }        }

<?php        class Test2{              public function __construct(){                    echo "Test2<br>";              }      }

<?php        function loadclass($classname){        $filename = "./".$classname.".class.php";    if(is_file($filename)){      include $filename;    }    }    spl_autoload_register("loadclass");    //实例化方法一    $class1 = "Test1";    if(class_exists($class1))//判断类是否存在      new $class1();        //实例化方法二    $class2 = "Test2";    $class2 = new ReflectionClass($class2);// 建立类的反射    $instance = $class2 ->newInstance();// 相当于实例化类