[PHP] PHP MVC框架中类的自动加载机制实例分析

<?php
/**
 * Created by PhpStorm.
 * User: koastal
 * Date: 2016/5/15
 * Time: 10:48
 */
define("APP_PATH",__DIR__."/..");
define("Controller_PATH",__DIR__."/../controller");
define("Model_PATH",__DIR__."/../model");
define("View_PATH",__DIR__."/../view");

<?php
/**
 * Created by PhpStorm.
 * User: koastal
 * Date: 2016/5/15
 * Time: 12:03
 */
class Loader
{
  public static function baseLoad()
  {
  require_once("Controller.php");
  require_once("Model.php");
  }
  public static function autoload($class)
  {
  $path = $class.".class.php";
  require_once($path);
  }
}
$include = array(Controller_PATH, Model_PATH,View_PATH);
set_include_path(get_include_path() . PATH_SEPARATOR .implode(PATH_SEPARATOR, $include));
spl_autoload_register(array('Loader', 'autoload'));
Loader::baseLoad();

<?php
/**
 * Created by PhpStorm.
 * User: koastal
 * Date: 2016/5/15
 * Time: 12:19
 */
require_once("Loader.php");

<?php
require_once(__DIR__."/libs/config.php");
require_once(__DIR__."/libs/boot.php");
$obj = new testController();
$obj->show();

<?php
/**
 * Created by PhpStorm.
 * User: koastal
 * Date: 2016/5/15
 * Time: 12:03
 */
require_once 'config.php';
class Loader
{
  public static function baseLoad()
  {
  require_once("Controller.php");
  require_once("Model.php");
  }
  public static function searchFile($filename,$path)
  {
  $filePath = false;
  $list = scandir($path);
  foreach($list as $file){
    $realPath = $path.DIRECTORY_SEPARATOR.$file;
    if(is_dir($realPath) && $file!='.' && $file!='..'){
    $res = Loader::searchFile($filename,$realPath);
    if($res){
      return $res;
    }
    }elseif($file!='.' && $file!='..'){
    if($file == $filename){
      $filePath = $realPath;
      break;
    }
    }
  }
  return $filePath;
  }
  public static function autoload($class)
  {
  $filename = $class.".class.php";
  $cflag = Loader::searchFile($filename,Controller_PATH);
  $mfalg = Loader::searchFile($filename,Model_PATH);
  $path = false;
  $path = ($cflag != false)? $cflag:$path;
  $path = ($mfalg != false)? $mfalg:$path;
  if($path == false){
    exit("Class Load Failed.");
  }else{
    require_once($path);
  }
  }
}
Loader::baseLoad();
spl_autoload_register(array('Loader', 'autoload'));