php 封装gd 库

使用sae 版 thinkphp 在本地和sae 上无法实现缩略图，缩略图主要使用在瀑布流上面，不然一张图片2 3 M，速度太慢，就自己封装了一个，见笑！

<?php class Thumb{ // 设置最大宽度，用来在编辑器中使用和显示 private $max_width = null; private $file_name = null; private $water_name = null; //获得文件名和图片宽度 public function __construct($max_widht,$file_name,$water_name) { $this->max_width = $max_widht; $this->file_name = $file_name; $this->water_name = $water_name; } public function create_image(){ // 获得ori图片信息 list($width,$height,$type) = getimagesize($this->file_name); // 当原有图片大于 要求的最大宽度时，才需要进行压缩 if($width > $this->max_width){ // 获得图片压缩百分比 $per = $this->max_width / $width; $new_width = $width * $per; $new_height = $height * $per; }else{ $new_height = $height; $new_width = $width; } //创建一个真彩色图像 $image_p = imagecreatetruecolor($new_width, $new_height -10); $image = $this->image_obj($type, $this->file_name); imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height); $this->image_dump($type, $image_p, $this->file_name); $this->water(); } /* * 生成为图片添加水印 */ private function water(){ $water_name = $this->water_name; $dist_name = $this->file_name; list($dist_width,$dist_height,$type) = getimagesize($dist_name); $dist_im = $this->image_obj($type, $this->file_name); $water_name = "D:/xampps/htdocs/buyingfeiblog/1/App/Modules/Admin/Tpl/Public/Images/water.png"; list($w_width,$w_height) = getimagesize($water_name); // 获得图片水印信息 $water_src = imagecreatefrompng($water_name); // 设置图片水印位置 在右下角 $x = ($dist_width - $w_width) / 4 * 3 ; $y =($dist_height - $w_height) /4 * 3 ; if(imagecopy($dist_im, $water_src, $x, $y, 0, 0, $w_width, $w_height)){ imagepng($dist_im,$dist_name); echo "success"; }else{ echo "error"; } } // 生成图片类型，生成不同图片 保持图片原本类型不发生变化 private function image_dump($type,$image_p,$filename){ switch ($type){ case 1: imagegif($image_p, $filename); $dis_im = imagecreatefromgif(file_name); break; case 2: imagejpeg($image_p, $this->file_name); $dis_im = imagecreatefromjpeg(file_name); break; case 3: imagepng($image_p,file_name); $dis_im = imagecreatefrompng(file_name); break; default : } } // 根据图片不同，生成不同资源对象 private function image_obj($type,$filename){ switch ($type){ // 1 = GIF，2 = JPG，3 = PNG， case 1: $image = imagecreatefromgif($filename); break; case 2: $image = imagecreatefromjpeg($filename); break; case 3: $image = imagecreatefrompng($filename); break; default : } return $image; } } $thumb = new Thumb(725,"D:/xampps/htdocs/test/test.jpg"); $thumb->create_image();//create_image ?>

就是这么简单，
主要包括生成真彩图，
创建图形对象资源
图片进行合并，ok！