spl_autoload_register自动加载类回调函数实现

Posted 2020-08-15 见与不见

随手写的，后台发现用不上，放上来以后可能用的着

  1 /**
  2  * SPL自动加载类
  3  */
  4 class AutoLoad
  5 {
  6 
  7     /**
  8      * 类文件所在目录
  9      *
 10      * @var string
 11      */
 12     protected $dir = "";
 13 
 14     /**
 15      * 类名与目录名映射数组
 16      *
 17      * @var array
 18      */
 19     protected $map = array();
 20 
 21     /**
 22      * 初始化自动加载类
 23      *
 24      * @param string $dir
 25      *            类文件所在目录
 26      * @param array|string $map
 27      *            类名称与目录名称映射,字符串方式:如果Zend命名空间映射到Zf2，写法：Zend|Zf2
 28      */
 29     public function __construct($dir, $map = [])
 30     {
 31         if (! $dir) {
 32             throw new Exception("类目录不能为空", 2001);
 33         }
 34         $dirLastChar = substr($dir, - 1, 1);
 35         if ($dirLastChar != "/" && $dirLastChar != "\\") {
 36             $dir .= DIRECTORY_SEPARATOR;
 37         }
 38         $this->dir = $dir;
 39         
 40         if (is_string($map)) {
 41             $mapTmp = explode(",", $map);
 42             $mapList = [];
 43             foreach ($mapTmp as $key => $item) {
 44                 $tmpArr = explode("|", $item);
 45                 if (count($tmpArr) >= 2) {
 46                     if ($tmpArr[0] && $tmpArr[1]) {
 47                         $mapList[$tmpArr[0]] = $tmpArr[1];
 48                     }
 49                 } elseif (count($tmpArr) == 1) {
 50                     if ($tmpArr[0]) {
 51                         $mapList[$tmpArr[0]] = $tmpArr[0];
 52                     }
 53                 }
 54             }
 55             
 56             $map = $mapList;
 57         }
 58         
 59         foreach ($map as $key => $item) {
 60             if ($key && $item) {
 61                 $this->addMap($key, $item);
 62             }
 63         }
 64     }
 65 
 66     function addMap($namespace, $path)
 67     {
 68         $this->map[$namespace] = $path;
 69     }
 70 
 71     /**
 72      * 获取类映射数组
 73      */
 74     function getMap()
 75     {
 76         return $this->map();
 77     }
 78 
 79     function clearMap()
 80     {
 81         $this->map = array();
 82     }
 83 
 84     /**
 85      * SPL类自动加载函数
 86      *
 87      * @param string $className            
 88      */
 89     public function load($className)
 90     {
 91         if (! $className) {
 92             return false;
 93         }
 94         $arr = explode("\\", $className);
 95         $nameSpace = isset($arr[0]) ? $arr[0] : "";
 96         
 97         if (! $nameSpace) {
 98             return false;
 99         }
100         if (! isset($this->map[$nameSpace])) {
101             return false;
102         }
103         unset($arr[0]);
104         
105         $fileName = implode(DIRECTORY_SEPARATOR, $arr);
106         $path = $this->dir . $this->map[$nameSpace] . DIRECTORY_SEPARATOR . $fileName . ".php";
107         require ($path);
108     }
109 }

调用示例

1 require ‘AutoLoad.php‘;
2         $autoload= new AutoLoad("Zend|Zf2");
3         spl_autoload_register(array($autoload,"load"));