怎么自动加载类文件

如何自动加载类文件！
现在用的是autoload（代码如下：），还有别的方法能自动加载类文件吗？除了include（具体文件路径）

PHP code

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function __autoload($className){
if(file_exists('model/'.$className.'.class.php')){
include_once('model/'.$className.'.class.php');
}
if(file_exists('Controller/'.$className.'.class.php')){
include_once('Controller/'.$className.'.class.php');
}

$prefix=$GLOBALS['groupName']=='main'?'':'../';
if(file_exists($prefix.'core/'.$className.'.class.php')){
include_once($prefix.'core/'.$className.'.class.php');
}
if(file_exists($prefix.'core/Smarty-3.1.6/'.$className.'.class.php')){
include_once($prefix.'core/Smarty-3.1.6/'.$className.'.class.php');
}
if(file_exists($prefix.'core/Smarty-3.1.6/sysplugins/'.$className.'.php')){
include_once($prefix.'core/Smarty-3.1.6/sysplugins/'.$className.'.php');
}

}

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PHP code

$arr = array('classPath1','classPath2','classPath3');
foreach($arr as $v){
  $new_path = $v.$className.'.<a style="color:#f60; text-decoration:underline;" title="php" href="https://www.php.cn/zt/15714.html" target="_blank">php</a>';
  if(file_exists($new_path)){
    include_once($new_path);
    break;
  }
} <div class="clear"></div>

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