spl_autoload_register自动加载类回调函数实现

随手写的，后台发现用不上，放上来以后可能用的着

/**
 * SPL自动加载类
 */
class AutoLoad
{

    /**
     * 类文件所在目录
     *
     * @var string
     */
    protected $dir = "";

    /**
     * 类名与目录名映射数组
     *
     * @var array
     */
    protected $map = array();

    /**
     * 初始化自动加载类
     *
     * @param string $dir
     *            类文件所在目录
     * @param array|string $map
     *            类名称与目录名称映射,字符串方式:如果Zend命名空间映射到Zf2，写法：Zend|Zf2
     */
    public function __construct($dir, $map = [])
    {
        if (! $dir) {
            throw new Exception("类目录不能为空", 2001);
        }
        $dirLastChar = substr($dir, - 1, 1);
        if ($dirLastChar != "/" && $dirLastChar != "\") {
            $dir .= DIRECTORY_SEPARATOR;
        }
        $this->dir = $dir;
        
        if (is_string($map)) {
            $mapTmp = explode(",", $map);
            $mapList = [];
            foreach ($mapTmp as $key => $item) {
                $tmpArr = explode("|", $item);
                if (count($tmpArr) >= 2) {
                    if ($tmpArr[0] && $tmpArr[1]) {
                        $mapList[$tmpArr[0]] = $tmpArr[1];
                    }
                } elseif (count($tmpArr) == 1) {
                    if ($tmpArr[0]) {
                        $mapList[$tmpArr[0]] = $tmpArr[0];
                    }
                }
            }
            
            $map = $mapList;
        }
        
        foreach ($map as $key => $item) {
            if ($key && $item) {
                $this->addMap($key, $item);
            }
        }
    }

    function addMap($namespace, $path)
    {
        $this->map[$namespace] = $path;
    }

    /**
     * 获取类映射数组
     */
    function getMap()
    {
        return $this->map();
    }

    function clearMap()
    {
        $this->map = array();
    }

    /**
     * SPL类自动加载函数
     *
     * @param string $className            
     */
    public function load($className)
    {
        if (! $className) {
            return false;
        }
        $arr = explode("\", $className);
        $nameSpace = isset($arr[0]) ? $arr[0] : "";
        
        if (! $nameSpace) {
            return false;
        }
        if (! isset($this->map[$nameSpace])) {
            return false;
        }
        unset($arr[0]);
        
        $fileName = implode(DIRECTORY_SEPARATOR, $arr);
        $path = $this->dir . $this->map[$nameSpace] . DIRECTORY_SEPARATOR . $fileName . ".php";
        require ($path);
    }
}

调用示例

require 'AutoLoad.php';
        $autoload= new AutoLoad("Zend|Zf2");
        spl_autoload_register(array($autoload,"load"));