本文实例讲述了摘自织梦CMS中的图片处理类。分享给大家供大家参考。具体如下：

<?php if(!defined("DEDEINC")) exit("dedecms");/** * 图像处理类 * * @version  $Id: image.class.php 1 18:10 2010年7月5日Z tianya $ * @package  DedeCMS.Libraries * @copyright  Copyright (c) 2007 - 2010, DesDev, Inc. * @license  http://help.dedecms.com/usersguide/license.html * @link   http://www.dedecms.com */class image{ var $attachinfo; var $targetfile; //图片路径 var $imagecreatefromfunc; var $imagefunc; var $attach; var $animatedgif; var $watermarkquality; var $watermarktext; var $thumbstatus; var $watermarkstatus; // 析构函数,兼容PHP4 function image($targetfile, $cfg_thumb, $cfg_watermarktext, $photo_waterpos, $photo_diaphaneity, $photo_wheight, $photo_wwidth, $cfg_watermarktype, $photo_marktrans,$trueMarkimg, $attach = array()) {  $this->__construct($targetfile, $cfg_thumb, $cfg_watermarktext, $photo_waterpos, $photo_diaphaneity, $photo_wheight, $photo_wwidth, $cfg_watermarktype, $photo_marktrans,$trueMarkimg, $attach); } // 析构函数 function __construct($targetfile, $cfg_thumb, $cfg_watermarktext, $photo_waterpos, $photo_diaphaneity, $photo_wheight, $photo_wwidth, $cfg_watermarktype, $photo_marktrans,$trueMarkimg, $attach = array()) {  $this->thumbstatus = $cfg_thumb;  $this->watermarktext = $cfg_watermarktext;  $this->watermarkstatus = $photo_waterpos;  $this->watermarkquality = $photo_marktrans;  $this->watermarkminwidth = $photo_wwidth;  $this->watermarkminheight = $photo_wheight;  $this->watermarktype = $cfg_watermarktype;  $this->watermarktrans = $photo_diaphaneity;  $this->animatedgif = 0;  $this->targetfile = $targetfile;  $this->attachinfo = @getimagesize($targetfile);  $this->attach = $attach;  switch($this->attachinfo["mime"])  {   case "image/jpeg":    $this->imagecreatefromfunc = function_exists("imagecreatefromjpeg") ? "imagecreatefromjpeg" : "";    $this->imagefunc = function_exists("imagejpeg") ? "imagejpeg" : "";    break;   case "image/gif":    $this->imagecreatefromfunc = function_exists("imagecreatefromgif") ? "imagecreatefromgif" : "";    $this->imagefunc = function_exists("imagegif") ? "imagegif" : "";    break;   case "image/png":    $this->imagecreatefromfunc = function_exists("imagecreatefrompng") ? "imagecreatefrompng" : "";    $this->imagefunc = function_exists("imagepng") ? "imagepng" : "";    break;  }//为空则匹配类型的函数不存在  $this->attach["size"] = empty($this->attach["size"]) ? @filesize($targetfile) : $this->attach["size"];  if($this->attachinfo["mime"] == "image/gif")  {   $fp = fopen($targetfile, "rb");   $targetfilecontent = fread($fp, $this->attach["size"]);   fclose($fp);   $this->animatedgif = strpos($targetfilecontent, "NETSCAPE2.0") === false ? 0 : 1;  } } /**  * 生成缩略图  *  * @access public  * @param  int $thumbwidth 图片宽度  * @param  int $thumbheight 图片高度  * @param  int $preview 是否预览  * @return void  */ function thumb($thumbwidth, $thumbheight, $preview = 0) {  $this->thumb_gd($thumbwidth, $thumbheight, $preview);   if($this->thumbstatus == 2 && $this->watermarkstatus)  {   $this->image($this->targetfile, $this->attach);   $this->attach["size"] = filesize($this->targetfile);  } } /**  * 图片水印  *  * @access public  * @param  int $preview 是否预览  * @return void  */ function watermark($preview = 0) {  if($this->watermarkminwidth && $this->attachinfo[0] <= $this->watermarkminwidth && $this->watermarkminheight && $this->attachinfo[1] <= $this->watermarkminheight)  {   return ;  }  $this->watermark_gd($preview); } /**  * 使用gd生成缩略图  *  * @access public  * @param  int $thumbwidth 图片宽度  * @param  int $thumbheight 图片高度  * @param  int $preview 是否预览  * @return void  */ function thumb_gd($thumbwidth, $thumbheight, $preview = 0) {  if($this->thumbstatus && function_exists("imagecreatetruecolor") && function_exists("imagecopyresampled") && function_exists("imagejpeg"))  {   $imagecreatefromfunc = $this->imagecreatefromfunc;   $imagefunc = $this->thumbstatus == 1 ? "imagejpeg" : $this->imagefunc;   list($imagewidth, $imageheight) = $this->attachinfo;   if(!$this->animatedgif && ($imagewidth >= $thumbwidth || $imageheight >= $thumbheight))   {    $attach_photo = $imagecreatefromfunc($this->targetfile);    $x_ratio = $thumbwidth / $imagewidth;    $y_ratio = $thumbheight / $imageheight;    if(($x_ratio * $imageheight) < $thumbheight)    {     $thumb["height"] = ceil($x_ratio * $imageheight);     $thumb["width"] = $thumbwidth;    }    else    {     $thumb["width"] = ceil($y_ratio * $imagewidth);     $thumb["height"] = $thumbheight;    }    $targetfile = !$preview ? ($this->thumbstatus == 1 ? $this->targetfile.".thumb.jpg" : $this->targetfile) : "./watermark_tmp.jpg";    $thumb_photo = imagecreatetruecolor($thumb["width"], $thumb["height"]);    imagecopyresampled($thumb_photo, $attach_photo, 0, 0, 0, 0, $thumb["width"], $thumb["height"], $imagewidth, $imageheight);    if($this->attachinfo["mime"] == "image/jpeg")    {     $imagefunc($thumb_photo, $targetfile, 100);    }    else    {     $imagefunc($thumb_photo, $targetfile);    }    $this->attach["thumb"] = $this->thumbstatus == 1 ? 1 : 0;   }  } } /**  * 使用gd进行水印  *  * @access public  * @param  int $preview 是否预览  * @return void  */ function watermark_gd($preview = 0) {  if($this->watermarkstatus && function_exists("imagecopy") && function_exists("imagealphablending") && function_exists("imagecopymerge"))  {   $imagecreatefunc = $this->imagecreatefromfunc;   $imagefunc = $this->imagefunc;   list($imagewidth, $imageheight) = $this->attachinfo;   if($this->watermarktype < 2)   {    $watermark_file = $this->watermarktype == 1 ? DEDEDATA."/mark/mark.png" : DEDEDATA."/mark/mark.gif";    $watermarkinfo = @getimagesize($watermark_file);    $watermark_logo = $this->watermarktype == 1 ? @imagecreatefrompng($watermark_file) : @imagecreatefromgif($watermark_file);    if(!$watermark_logo)    {     return ;    }    list($logowidth, $logoheight) = $watermarkinfo;   }   else   {    $box = @imagettfbbox($this->watermarktext["size"], $this->watermarktext["angle"], $this->watermarktext["fontpath"],$this->watermarktext["text"]);    $logowidth = max($box[2], $box[4]) - min($box[0], $box[6]);    $logoheight = max($box[1], $box[3]) - min($box[5], $box[7]);    $ax = min($box[0], $box[6]) * -1;    $ay = min($box[5], $box[7]) * -1;   }   $wmwidth = $imagewidth - $logowidth;   $wmheight = $imageheight - $logoheight;   if(($this->watermarktype < 2 && is_readable($watermark_file) || $this->watermarktype == 2) && $wmwidth > 10 && $wmheight > 10 && !$this->animatedgif)   {    switch($this->watermarkstatus)    {     case 1:       $x = +5;      $y = +5;      break;     case 2:      $x = ($imagewidth - $logowidth) / 2;      $y = +5;      break;     case 3:      $x = $imagewidth - $logowidth - 5;      $y = +5;      break;     case 4:      $x = +5;      $y = ($imageheight - $logoheight) / 2;      break;     case 5:      $x = ($imagewidth - $logowidth) / 2;      $y = ($imageheight - $logoheight) / 2;      break;     case 6:      $x = $imagewidth - $logowidth - 5;      $y = ($imageheight - $logoheight) / 2;      break;     case 7:      $x = +5;      $y = $imageheight - $logoheight - 5;      break;     case 8:      $x = ($imagewidth - $logowidth) / 2;      $y = $imageheight - $logoheight - 5;      break;     case 9:      $x = $imagewidth - $logowidth - 5;      $y = $imageheight - $logoheight -5;      break;    }    $dst_photo = @imagecreatetruecolor($imagewidth, $imageheight);    $target_photo = $imagecreatefunc($this->targetfile);    imagecopy($dst_photo, $target_photo, 0, 0, 0, 0, $imagewidth, $imageheight);    if($this->watermarktype == 1)    {     imagecopy($dst_photo, $watermark_logo, $x, $y, 0, 0, $logowidth, $logoheight);    }    elseif($this->watermarktype == 2)    {     if(($this->watermarktext["shadowx"] || $this->watermarktext["shadowy"]) && $this->watermarktext["shadowcolor"])     {      $shadowcolorrgb = explode(",", $this->watermarktext["shadowcolor"]);      $shadowcolor = imagecolorallocate($dst_photo, $shadowcolorrgb[0], $shadowcolorrgb[1], $shadowcolorrgb[2]);      imagettftext($dst_photo, $this->watermarktext["size"], $this->watermarktext["angle"],      $x + $ax + $this->watermarktext["shadowx"], $y + $ay + $this->watermarktext["shadowy"], $shadowcolor,      $this->watermarktext["fontpath"], $this->watermarktext["text"]);     }     $colorrgb = explode(",", $this->watermarktext["color"]);     $color = imagecolorallocate($dst_photo, $colorrgb[0], $colorrgb[1], $colorrgb[2]);     imagettftext($dst_photo, $this->watermarktext["size"], $this->watermarktext["angle"],     $x + $ax, $y + $ay, $color, $this->watermarktext["fontpath"], $this->watermarktext["text"]);    }    else    {     imagealphablending($watermark_logo, true);     imagecopymerge($dst_photo, $watermark_logo, $x, $y, 0, 0, $logowidth, $logoheight, $this->watermarktrans);    }    $targetfile = !$preview ? $this->targetfile : "./watermark_tmp.jpg";    if($this->attachinfo["mime"] == "image/jpeg")    {     $imagefunc($dst_photo, $targetfile, $this->watermarkquality);    }    else    {     $imagefunc($dst_photo, $targetfile);    }    $this->attach["size"] = filesize($this->targetfile);   }  } }}//End Class

希望本文所述对大家的php程序设计有所帮助。