PHP简单图片处理类封装实现

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项目链接：http://www.yusian.com/thread-11071-1-1.html

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<?php     class Image{         private $path;         // 构造方法，给定图片所在的目录         public function __construct($path){             $this->path = $path;         }                   // 1、创建缩略图         public function thumb($filename, $w, $h, $prefix){             $file = $this->path."/".$filename;             list($width, $height, $type) = getimagesize($file);             // 修正比例             $p = 1;             if ($width > $height){                 $p = $w / $width;                 $h = $p * $height;             }else{                 $p = $h / $height;                 $w = $p * $width;             }             // 创建图片资源和新图的图片资源             $image = $this->get_image_source($file);             $image_new = imagecreatetruecolor($w, $h);             // 将原图的指定区域绘制到新图的指定区域即可             imagecopyresampled($image_new, $image, 0, 0, 0, 0, $w, $h, $width, $height);             // 输出图片并释放资源             $save_image_method = "image".$this->file_type($file);             $save_image_method($image_new, $this->path."/".$prefix.$filename);             imagedestroy($image);         }                   // 2、增加图片水印         public function water_mark($filename, $string, $position, $save_name){             $file = $this->path."/".$filename;             list($width, $height, $type) = getimagesize($file);             $image = $this->get_image_source($file);             $color = imagecolorallocate($image, 128, 128, 128);             $font = 5;             $w = imagefontwidth($font) * strlen($string);             $h = imagefontheight($font);             $x = 10;             $y = 10;             switch($position){                 case 1:{$x = 10; $y = 10;}break;                 case 4:{$x = 10; $y = ($height - $h)*0.5;}break;                 case 7:{$x = 10; $y = ($height - $h) - 10;}break;                                   case 2:{$x = ($width - $w)*0.5; $y = 10;}break;                 case 5:{$x = ($width - $w)*0.5; $y = ($height - $h)*0.5;}break;                 case 8:{$x = ($width - $w)*0.5; $y = ($height - $h) - 10;}break;                                   case  3:{$x = ($width - $w) - 10; $y = 10;}break;                 case  6:{$x = ($width - $w) - 10; $y = ($height - $h)*0.5;}break;                 default:{$x = ($width - $w) - 10; $y = ($height - $h) - 10;}break;             }             imagestring($image, $font, $x, $y, $string, $color);             // 输出图片并释放资源             $save_image_method = "image".$this->file_type($file);             $new_filename = strlen($save_name) ? $save_name : $filename;             $save_image_method($image, $this->path."/".$new_filename);             imagedestroy($image);         }                   // 3、使用unlink函数删除图片         public function delete_image($filename){             $file_path = $this->path."/".$filename;             $thumb_path = $this->path."/thumb_".$filename;             if(file_exists($file_path) && $filename)unlink($file_path);             if(file_exists($thumb_path) && $filename)unlink($thumb_path);         }                   /****************私有方法******************/         // 获取图片文件类型         private function file_type($file){             list($width, $height, $type) = getimagesize($file);             $type_array = array(1=>"gif", 2=>"jpeg", 3=>"png");             return $type_array[$type];         }         // 创建图片文件资源         private function get_image_source($file){             $createimage = "imagecreatefrom".$this->file_type($file);             return $createimage($file);         }     }