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Homephp教程php手册第十二节--类的自动加载--ClassesandObjectsinPHP512

| = 本文为Haohappy读> | = 中Classes and Objects一章的笔记 | = 翻译为主+个人心得 | = 为避免可能发生的不必要的麻烦请勿转载,谢谢 | = 欢迎批评指正,希望和所有PHP爱好者共同进步! +-------------------------------------------------------------------------------+ */ 第十二节--类的自动加载 当你尝试使用一个未定义的类时,PHP会报告一个致命错误. 解决方法就是添加一个类,可以用include包含一个文件. 毕竟你知道要用到哪个类. 但是,PHP提供了类的自动加载功能, 这可以节省编程的时间. 当你尝试使用一个PHP没有组织到的类, 它会寻找一个__autoload的全局函数. 如果存在这个函数,PHP会用一个参数来调用它,参数即类的名称. 例子6.15说明了__autoload是如何使用的. 它假设当前目录下每个文件对应一个类. 当脚本尝试来产生一个类User的实例,PHP会执行__autoload. 脚本假设class_User.php中定义有User类.. 不管调用时是大写还是小写,PHP将返回名称的小写. Listing 6.15 Class autoloading name = "Leon"; $u->printName(); ?>

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