PHP中的延迟加载类

Question

我想懒惰加载类但没有成功

<?php

class Employee{

    function __autoload($class){

        require_once($class);
    }


    function display(){

        $obj = new employeeModel();
        $obj->printSomthing();
    }
}

现在当我做这个

function display(){
            require_once('emplpyeeModel.php');
            $obj = new employeeModel();
            $obj->printSomthing();
        }

它的工作原理,但我想懒得加载这个类.

Answer 1

__autoload是一个独立的函数,而不是类的方法.您的代码应如下所示:

<?php

class Employee{

    function display(){

        $obj = new employeeModel();
        $obj->printSomthing();
    }
}

function __autoload($class) {
    require_once($class.'.php');
}

function display(){
    $obj = new Employee();
    $obj->printSomthing();
}

UPDATE

从php手册中取的示例:

<?php
function __autoload($class_name) {
    include $class_name . '.php';
}

$obj  = new MyClass1();
$obj2 = new MyClass2(); 
?>

Answer 2

Employee稍微改变一下：

class Employee {

   public static function __autoload($class) {
      //_once is not needed because this is only called once per class anyway,
      //unless it fails.
      require $class;
   }

   /* Other methods Omitted */
}
spl_autoload_register('Employee::__autoload');