php魔术方法： __get() 和 __set()的妙用
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<?phpclass Post { private $title; private $content; private $author; private $comments; private $_getters = array('title', 'content', 'author', 'comments'); private $_setters = array('title', 'content', 'author'); public function __get($property) { if (in_array($property, $this->_setters)) { return $this->$property; } else if (method_exists($this, '_get_' . $property)) return call_user_func(array($this, '_get_' . $property)); else if (in_array($property, $this->_getters) OR method_exists($this, '_set_' . $property)) throw new Exception('Property "' . $property . '" is write-only.'); else throw new Exception('Property "' . $property . '" is not accessible.'); } public function __set($property, $value) { if (in_array($property, $this->_getters)) { $this->$property = $value; } else if (method_exists($this, '_set_' . $property)) call_user_func(array($this, '_set_' . $property), $value); else if (in_array($property, $this->_setters) OR method_exists($this, '_get_' . $property)) throw new Exception('Property "' . $property . '" is read-only.'); else throw new Exception('Property "' . $property . '" is not accessible.'); }}?>This way the variables in the $_getters array can be read from the outside and the variables in the $_setters array can be modified from the outside, like this:<?php$post = new Post();$post->title = 'Hello, World';echo $post->title;// The following will throw an exception since $comments is read<em style="color:transparent">本文来源[email protected]搞@^&代*@码)网9</em><strong>搞代gaodaima码</strong>-only:$post->comments = 23;?>And in case you need a less generic getter or setter at some point, you can remove the variable from the $_getters or $_setters array and implement a method like:<?phpprivate function _set_title($value) { $this->title = str_replace('World', 'Universe', $value);}?>And from the outside the property could still be used with:<?php$post->title = 'Hello, World!';?>
?上面是手册里的例子，但是我觉得应该是先判断类里面是否有处理属性的方法，有的话就调用该方法，没有就直接设置该属性。
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转载请注明原文链接：php幻术方法： _get() 和 _set()的妙用
转载请注明原文链接：php幻术方法： _get() 和 _set()的妙用
