<?php
/* 实例4 */
/* 使用工厂类解析图像工作 */
interface IImage {function getWidth();function getHeight();function getData();
}
class Image_PNG implements IImage {protected $_width, $height, $_data;public function __construct($file) {$this->_file = $file;$this->_parse();}private function _parse() {//完成PNG格式的解析工作//并填充$_width, $_height, $_data$this->_data = getimagesize($this->_file);list($this->_width, $this->_height) = $this->_data;}public function getWidth() {return $this->_width;}public function getHeight() {return $this->_height;}public function getData() {return $this->_data;}
}
class Image_JPGE implements IImage {protected $_width, $_height, $_data;public function __construct($file) {$this->_file = $file;$this->_parse();}private function _parse() {//完成JPGE格式的解析工作//并填充$_width, $_height, $_data//$this->_width = imagesx($this->_file);//$this->_height = imagesx($this->_file);$this->_data = getimagesize($this->_file);list($this->_width, $this->_height) = $this->_data;}public function getWidth(){return $this->_width;}public function getHeight(){return $this->_height;}public function getData() {return $this->_data;}
}
class ImageFactory {public static function factory($file) {$filename = pathinfo($file);switch(strtolower($filename['extension'])){case 'jpg':$return = new Image_JPEG($file);break;case 'png':$return = new Image_PNG($file);break;default:echo '图片类型不正确';break;}if($return instanceof IImage) {return $return ;} else {echo '出错了';exit();}}}
$image = ImageFactory::factory('path/my.png');
var_dump($image->getWidth());
echo '<br>';
print_r($image->getheight());
echo '<br>';
print_r($image->getData());