使用 php 的简单类

Question

你好，我是 PHP 新手，我需要帮助来了解 PHP 类的基础知识。

我想要一个使用 private public protected 和 static 的类的示例。
以及它们是如何工作的..

提前致谢。

哦，我也忘记了如何扩展。 我在谈论父母和孩子什么的。 再次感谢。

Answer 1

• http://php.net/manual/en/language.oop5.php
• http://php.net/manual/en/language.oop5.basic.php
• http://www.w3schools.com/php/php_exception.asp

谷歌有很多例子

Answer 2

您需要的一切： http://php.net/manual/en/language.oop5.php ！

Answer 3

http://www.expertating.com/courseware/PHPcourse/PHP -Classes-Objects-6.asp

Answer 4

绝对同意其他人的观点。您应该阅读 5.5 亿份在线 PHP 手册，包括其他答案中提供的链接。与此同时，你会得到这个：

class one {
   private $name;
   const ONE = 'ONE';

   // php magic function.  allocate memory for object upon instantiation
   // called with new
   public function __construct($name = null) {
      $this->init($name);
   }

   protected function name() {
      return $this->name;
   }

   // php magic function called when object variable is accessed in a string context
   public function __toString() {
      return __CLASS__ . ': ' . $this->name;
   }

   // static functions can be called without instantiation
   public static function con() {
      echo self::ONE;
   }

   private function init($name) {
      $this->name = $name;
   }
}


// two cannot overwrite method init() -- it is private.
// two has no access to $name.  It is private in one and not visible to two
class two extends one {
   // protected methods can be overwritten
   protected function name() {
      return parent::name();
   }
   // so can public methods
   public function __toString() {
      return __CLASS__ . ': ' . $this->name();
   }
}

// static method call; no instantiation needed
echo one::con() . "\n"; // ONE
// public methods can be called by child class
echo two::con() . "\n"; // ONE
$one = new one('uno');
echo "$one\n"; // one: uno
$two = new two('dos');
echo "$two\n"; // two: dos
$one->name(); // bork! No public access to this method