php实现的支持imagemagick及gd库两种处理的缩略图生成类

php实现的支持imagemagick及gd库两种处理的缩略图生成类 更新时间：2014年09月23日 11:34:15 投稿：shichen2014 我要评论这篇文章主要介绍了php实现的支持imagemagick及gd库两种处理的缩略图生成类,包含了用法的详细描述,非常实用,需要的朋友可以参考下本文实例讲述了php实现的支持imagemagick及gd库两种处理的缩略图生成类及其用

本文实例讲述了php实现的支持imagemagick及gd库两种处理的缩略图生成类及其用法实例，非常具有实用价值。分享给大家供大家参考。具体如下：

一、功能:

1.按比例缩小/放大 2.填充背景色 3.按区域裁剪 4.添加水印，包括水印的位置，透明度等

使用imagemagick/GD库实现，imagemagick地址：www.imagemagick.org 需要安装imagemagick，安装方法如下：//www.jb51.net/article/55528.htm

二、实现方法：

PicThumb.class.php类文件如下：

<?php 
/** 缩略图生成类,支持imagemagick及gd库两种处理 
* Date: 2013-07-15 
* Author: fdipzone 
* Ver: 1.2 
* 
* Func: 
* public set_config: 设置参数 
* public create_thumb: 生成缩略图 
* private fit: 缩略图片 
* private crop: 裁剪图片 
* private gd_fit: GD库缩略图片 
* private gd_crop: GD库裁剪图片 
* private get_size: 获取要转换的size 
* private get_crop_offset: 获取裁图的偏移量 
* private add_watermark: 添加水印 
* private check_handler: 判断处理程序是否已安装 
* private create_dirs: 创建目录 
* private exists: 判断参数是否存在 
* private to_log: 记录log 
* private hex2rgb: hex颜色转rgb颜色 
* private get_file_ext: 获取图片类型 
* 
* ver: 1.1 增加GD库处理 
* ver: 1.2 增加width,height错误参数处理 
* 增加当图片colorspace不为RGB时作转RGB处理 
* 修正使用crop保存为gif时出现透明无效区域问题，使用+repage参数，删除透明无效区域即可 
* 
* tips:建议使用imagemagick 
* GD库不支持透明度水印,如果必须使用透明水印,请将水印图片做成有透明度。 
* GD库输出gif如加透明水印，会有问题。 
*/ 
 
class PicThumb{ // class start 
 
 private $_log = null; // log file 
 private $_handler = null; // 进行图片处理的程序,imagemagick/gd库 
 private $_type = 'fit'; // fit or crop 
 private $_source = null; // 原图路径 
 private $_dest = null; // 缩略图路径 
 private $_watermark = null; // 水印图片 
 private $_opacity = 75; // 水印圖片透明度,gd库不支持 
 private $_gravity = 'SouthEast'; // 水印摆放位置 NorthWest, North, NorthEast, West, Center, East, SouthWest, South, SouthEast 
 private $_geometry = '+10+10'; // 水印定位,gd库不支持 
 private $_croppos = 'TL'; // 截图的位置 TL TM TR ML MM MR BL BM BR 
 private $_bgcolor = null; // 填充的背景色 
 private $_quality = 90; // 生成的图片质量 
 private $_width = null; // 指定区域宽度 
 private $_height = null; // 指定区域高度 
 
 // 初始化 
 public function __construct($logfile=''){ 
 if($logfile!=''){ 
 $this->_log = $logfile; 
 } 
 } 
 
 // 设置参数 
 public function set_config($param=array()){ 
 $this->_handler = $this->exists($param, 'handler')? strtolower($param['handler']) : null; 
 $this->_type = $this->exists($param, 'type')? strtolower($param['type']) : 'fit'; 
 $this->_watermark = $this->exists($param, 'watermark')? $param['watermark'] : null; 
 $this->_opacity = $this->exists($param, 'opacity')? $param['opacity'] : 75; 
 $this->_gravity = $this->exists($param, 'gravity')? $param['gravity'] : 'SouthEast'; 
 $this->_geometry = $this->exists($param, 'geometry')? $param['geometry'] : '+10+10'; 
 $this->_croppos = $this->exists($param, 'croppos')? $param['croppos'] : 'TL'; 
 $this->_bgcolor = $this->exists($param, 'bgcolor')? $param['bgcolor'] : null; 
 $this->_quality = $this->exists($param, 'quality')? $param['quality'] : 90; 
 $this->_width = $this->exists($param, 'width')? $param['width'] : null; 
 $this->_height = $this->exists($param, 'height')? $param['height'] : null; 
 } 
 
 /** 创建缩略图 
 * @param String $source 原图 
 * @param String $dest 目标图 
 * @return boolean 
 */ 
 public function create_thumb($source, $dest){ 
 // 检查使用的handler是否已安装 
 if(!$this->check_handler()){ 
 $this->to_log('handler not installed'); 
 return false; 
 } 
 // 判断区域宽高是否正确 
 if(!is_numeric($this->_width) || !is_numeric($this->_height) || $this->_width<=0 || $this->_height<=0){ 
 $this->to_log('width or height invalid'); 
 return false; 
 } 
 
 // 判断源文件是否存在 
 if(!file_exists($source)){ 
 $this->to_log($source.' not exists'); 
 return false; 
 } 
 
 // 创建目标文件路径 
 if(!$this->create_dirs($dest)){ 
 $this->to_log(dirname($dest).' create fail'); 
 return false; 
 } 
 
 $this->_source = $source; // 源文件 
 $this->_dest = $dest; // 目标文件 
 
 // 处理图片 
 switch($this->_type){ 
 case 'fit': 
 if($this->_handler=='imagemagick'){ 
 return $this->fit(); 
 }else{ 
 return $this->gd_fit(); 
 } 
 break; 
 
 case 'crop': 
 if($this->_handler=='imagemagick'){ 
 return $this->crop(); 
 }else{ 
 return $this->gd_crop(); 
 } 
 break; 
 
 default: 
 $this->to_log($this->_type.' not fit and crop'); 
 return false; 
 } 
 } 
 
 /** 按比例压缩或拉伸图片 
 * @return boolean 
 */ 
 private function fit(){ 
 
 // 判断是否填充背景 
 $bgcolor = ($this->_bgcolor!=null)? 
 sprintf(" -background '%s' -gravity center -extent '%sx%s' ", $this->_bgcolor, $this->_width, $this->_height) : ""; 
 
 // 判断是否要转为RGB 
 $source_info = getimagesize($this->_source); 
 $colorspace = (!isset($source_info['channels']) || $source_info['channels']!=3)? ' -colorspace RGB ' : ''; 
 
 // 命令行 
 $cmd = sprintf("convert -resize '%sx%s' '%s' %s -quality %s %s '%s'", $this->_width, $this->_height, $this->_source, $bgcolor, $this->_quality, $colorspace, $this->_dest); 
 
 // 记录执行的命令 
 $this->to_log($cmd); 
 
 // 执行命令 
 exec($cmd); 
 
 // 添加水印 
 $this->add_watermark($this->_dest); 
 
 return is_file($this->_dest)? true : false; 
 } 
 
 /** 裁剪图片 
 * @return boolean 
 */ 
 private function crop(){ 
 // 获取生成的图片尺寸 
 list($pic_w, $pic_h) = $this->get_size(); 
 
 // 获取截图的偏移量 
 list($offset_w, $offset_h) = $this->get_crop_offset($pic_w, $pic_h); 
 
 // 判断是否要转为RGB 
 $source_info = getimagesize($this->_source); 
 $colorspace = (!isset($source_info['channels']) || $source_info['channels']!=3)? ' -colorspace RGB ' : ''; 
 
 // 命令行 
 $cmd = sprintf("convert -resize '%sx%s' '%s' -quality %s %s -crop %sx%s+%s+%s +repage '%s'", $pic_w, $pic_h, $this->_source, $this->_quality, $colorspace, $this->_width, $this->_height, $offset_w, $offset_h, $this->_dest); 
 
 // 记录执行的命令 
 $this->to_log($cmd); 
 
 // 执行命令 
 exec($cmd); 
 
 // 添加水印 
 $this->add_watermark($this->_dest); 
 
 return is_file($this->_dest)? true : false; 
 } 
 
 /** GD库按比例压缩或拉伸图片 
 * @return boolean 
 */ 
 private function gd_fit(){ 
 // 获取生成的图片尺寸 
 list($pic_w, $pic_h) = $this->get_size(); 
 
 list($owidth, $oheight, $otype) = getimagesize($this->_source); 
 
 switch($otype){ 
 case 1: $source_img = imagecreatefromgif($this->_source); break; 
 case 2: $source_img = imagecreatefromjpeg($this->_source); break; 
 case 3: $source_img = imagecreatefrompng($this->_source); break; 
 default: return false; 
 } 
 
 // 按比例缩略/拉伸图片 
 $new_img = imagecreatetruecolor($pic_w, $pic_h); 
 imagecopyresampled($new_img, $source_img, 0, 0, 0, 0, $pic_w, $pic_h, $owidth, $oheight); 
 
 // 判断是否填充背景 
 if($this->_bgcolor!=null){ 
 $bg_img = imagecreatetruecolor($this->_width, $this->_height); 
 $rgb = $this->hex2rgb($this->_bgcolor); 
 $bgcolor =imagecolorallocate($bg_img, $rgb['r'], $rgb['g'], $rgb['b']); 
 imagefill($bg_img, 0, 0, $bgcolor); 
 imagecopy($bg_img, $new_img, (int)(($this->_width-$pic_w)/2), (int)(($this->_height-$pic_h)/2), 0, 0, $pic_w, $pic_h); 
 $new_img = $bg_img; 
 } 
 
 // 获取目标图片的类型 
 $dest_ext = $this->get_file_ext($this->_dest); 
 
 // 生成图片 
 switch($dest_ext){ 
 case 1: imagegif($new_img, $this->_dest, $this->_quality); break; 
 case 2: imagejpeg($new_img, $this->_dest, $this->_quality); break; 
 case 3: imagepng($new_img, $this->_dest, (int)(($this->_quality-1)/10)); break; 
 } 
 
 if(isset($source_img)){ 
 imagedestroy($source_img); 
 } 
 
 if(isset($new_img)){ 
 imagedestroy($new_img); 
 } 
 
 // 添加水印 
 $this->add_watermark($this->_dest); 
 
 return is_file($this->_dest)? true : false; 
 } 
 
 /** GD库裁剪图片 
 * @return boolean 
 */ 
 private function gd_crop(){ 
 
 // 获取生成的图片尺寸 
 list($pic_w, $pic_h) = $this->get_size(); 
 
 // 获取截图的偏移量 
 list($offset_w, $offset_h) = $this->get_crop_offset($pic_w, $pic_h); 
 
 list($owidth, $oheight, $otype) = getimagesize($this->_source); 
 
 switch($otype){ 
 case 1: $source_img = imagecreatefromgif($this->_source); break; 
 case 2: $source_img = imagecreatefromjpeg($this->_source); break; 
 case 3: $source_img = imagecreatefrompng($this->_source); break; 
 default: return false; 
 } 
 
 // 按比例缩略/拉伸图片 
 $tmp_img = imagecreatetruecolor($pic_w, $pic_h); 
 imagecopyresampled($tmp_img, $source_img, 0, 0, 0, 0, $pic_w, $pic_h, $owidth, $oheight); 
 
 // 裁剪图片 
 $new_img = imagecreatetruecolor($this->_width, $this->_height); 
 imagecopyresampled($new_img, $tmp_img, 0, 0, $offset_w, $offset_h, $this->_width, $this->_height, $this->_width, $this->_height); 
 
 // 获取目标图片的类型 
 $dest_ext = $this->get_file_ext($this->_dest); 
 
 // 生成图片 
 switch($dest_ext){ 
 case 1: imagegif($new_img, $this->_dest, $this->_quality); break; 
 case 2: imagejpeg($new_img, $this->_dest, $this->_quality); break; 
 case 3: imagepng($new_img, $this->_dest, (int)(($this->_quality-1)/10)); break; 
 } 
 
 if(isset($source_img)){ 
 imagedestroy($source_img); 
 } 
 
 if(isset($tmp_img)){ 
 imagedestroy($tmp_img); 
 } 
 
 if(isset($new_img)){ 
 imagedestroy($new_img); 
 } 
 
 // 添加水印 
 $this->add_watermark($this->_dest); 
 
 return is_file($this->_dest)? true : false; 
 } 
 
 /** 获取目标图生成的size 
 * @return Array $width, $height 
 */ 
 private function get_size(){ 
 list($owidth, $oheight) = getimagesize($this->_source); 
 $width = (int)($this->_width); 
 $height = (int)($this->_height); 
 
 switch($this->_type){ 
 case 'fit': 
 $pic_w = $width; 
 $pic_h = (int)($pic_w*$oheight/$owidth); 
 if($pic_h>$height){ 
 $pic_h = $height; 
 $pic_w = (int)($pic_h*$owidth/$oheight); 
 } 
 break; 
 case 'crop': 
 if($owidth>$oheight){ 
 $pic_h = $height; 
 $pic_w = (int)($pic_h*$owidth/$oheight); 
 }else{ 
 $pic_w = $width; 
 $pic_h = (int)($pic_w*$oheight/$owidth); 
 } 
 break; 
 } 
 return array($pic_w, $pic_h); 
 } 
 
 /** 获取截图的偏移量 
 * @param int $pic_w 图宽度 
 * @param int $pic_h 图高度 
 * @return Array $offset_w, $offset_h 
 */ 
 private function get_crop_offset($pic_w, $pic_h){ 
 $offset_w = 0; 
 $offset_h = 0; 
 
 switch(strtoupper($this->_croppos)){ 
 case 'TL': 
 $offset_w = 0; 
 $offset_h = 0; 
 break; 
 
 case 'TM': 
 $offset_w = (int)(($pic_w-$this->_width)/2); 
 $offset_h = 0; 
 break; 
 
 case 'TR': 
 $offset_w = (int)($pic_w-$this->_width); 
 $offset_h = 0; 
 break; 
 
 case 'ML': 
 $offset_w = 0; 
 $offset_h = (int)(($pic_h-$this->_height)/2); 
 break; 
 
 case 'MM': 
 $offset_w = (int)(($pic_w-$this->_width)/2); 
 $offset_h = (int)(($pic_h-$this->_height)/2); 
 break; 
 
 case 'MR': 
 $offset_w = (int)($pic_w-$this->_width); 
 $offset_h = (int)(($pic_h-$this->_height)/2); 
 break; 
 
 case 'BL': 
 $offset_w = 0; 
 $offset_h = (int)($pic_h-$this->_height); 
 break; 
 
 case 'BM': 
 $offset_w = (int)(($pic_w-$this->_width)/2); 
 $offset_h = (int)($pic_h-$this->_height); 
 break; 
 
 case 'BR': 
 $offset_w = (int)($pic_w-$this->_width); 
 $offset_h = (int)($pic_h-$this->_height); 
 break; 
 } 
 return array($offset_w, $offset_h); 
 } 
 
 /** 添加水印 
 * @param String $dest 图片路径 
 */ 
 private function add_watermark($dest){ 
 if($this->_watermark!=null && file_exists($this->_watermark) && file_exists($dest)){ 
 list($owidth, $oheight, $otype) = getimagesize($dest); 
 list($w, $h, $wtype) = getimagesize($this->_watermark); 
 
 // 水印图比原图要小才加水印 
 if($w<=$owidth && $h<=$oheight){ 
 
 if($this->_handler=='imagemagick'){ // imagemagick 添加水印 
 
 $cmd = sprintf("composite -gravity %s -geometry %s -dissolve %s '%s' %s %s", $this->_gravity, $this->_geometry, $this->_opacity, $this->_watermark, $dest, $dest); 
 
 $this->to_log($cmd); 
 
 exec($cmd); 
 
 }else{ // gd 添加水印 
 
 switch($wtype){ 
 case 1: $water_img = imagecreatefromgif($this->_watermark); break; 
 case 2: $water_img = imagecreatefromjpeg($this->_watermark); break; 
 case 3: $water_img = imagecreatefrompng($this->_watermark); break; 
 default: return false; 
 } 
 
 switch($otype){ 
 case 1: $dest_img = imagecreatefromgif($dest); break; 
 case 2: $dest_img = imagecreatefromjpeg($dest); break; 
 case 3: $dest_img = imagecreatefrompng($dest); break; 
 default: return false; 
 } 
 
 // 水印位置 
 switch(strtolower($this->_gravity)){ 
 case 'northwest': 
 $posX = 0; 
 $posY = 0; 
 break; 
 case 'north': 
 $posX = ($owidth - $w) / 2; 
 $posY = 0; 
 break; 
 case 'northeast': 
 $posX = $owidth - $w; 
 $posY = 0; 
 break; 
 case 'west': 
 $posX = 0; 
 $posY = ($oheight - $h) / 2; 
 break; 
 case 'center': 
 $posX = ($owidth - $w) / 2; 
 $posY = ($oheight - $h) / 2; 
 break; 
 case 'east': 
 $posX = $owidth - $w; 
 $posY = ($oheight - $h) / 2; 
 break; 
 case 'southwest': 
 $posX = 0; 
 $posY = $oheight - $h; 
 break; 
 case 'south': 
 $posX = ($owidth - $w) / 2; 
 $posY = $oheight - $h; 
 break; 
 case 'southeast': 
 $posX = $owidth - $w; 
 $posY = $oheight - $h; 
 break; 
 } 
 
 imagealphablending($dest_img, true); 
 imagecopy($dest_img, $water_img, $posX, $posY, 0, 0, $w, $h); 
 
 switch($otype){ 
 case 1:imagegif($dest_img, $dest, $this->_quality); break; 
 case 2:imagejpeg($dest_img, $dest, $this->_quality); break; 
 case 3:imagepng($dest_img, $dest, (int)(($this->_quality-1)/10)); break; 
 } 
 
 if(isset($water_img)){ 
 imagedestroy($water_img); 
 } 
 
 if(isset($dest_img)){ 
 imagedestroy($dest_img); 
 } 
 } 
 } 
 } 
 } 
 
 /** 判断处理程序是否已安装 
 * @return boolean 
 */ 
 private function check_handler(){ 
 
 $handler = $this->_handler; 
 
 if(!in_array($handler, array('imagemagick', 'gd', null))){ 
 return false; 
 } 
 
 // 检查是否有安装imagemagick 
 $imagemagick_installed = strstr(shell_exec('convert -version'),'Version: ImageMagick')!=''? true : false; 
 
 // 检查是否有安装gd库 
 $gd_installed = function_exists('gd_info')? true : false; 
 
 switch($handler){ 
 case 'imagemagick': 
 return $imagemagick_installed; 
 break; 
 
 case 'gd': 
 return $gd_installed; 
 break; 
 
 case null: 
 if($imagemagick_installed){ 
 $this->_handler = 'imagemagick'; 
 return true; 
 } 
 
 if($gd_installed){ 
 $this->_handler = 'gd'; 
 return true; 
 } 
 break; 
 } 
 return false; 
 } 
 
 /** 创建图片目录 
 * @param String $path 
 * @return boolean 
 */ 
 private function create_dirs($dest){ 
 if(!is_dir(dirname($dest))){ 
 return mkdir(dirname($dest), 0777, true); 
 } 
 return true; 
 } 
 
 /** 判断参数是否存在 
 * @param Array $obj 数组对象 
 * @param String $key 要查找的key 
 * @return boolean 
 */ 
 private function exists($obj,$key=''){ 
 if($key==''){ 
 return isset($obj) && !empty($obj); 
 }else{ 
 $keys = explode('.',$key); 
 for($i=0,$max=count($keys); $i<$max; $i++){ 
 if(isset($obj[$keys[$i]])){ 
 $obj = $obj[$keys[$i]]; 
 }else{ 
 return false; 
 } 
 } 
 return isset($obj) && !empty($obj); 
 } 
 } 
 
 /** 记录log 
 * @param String $msg 要记录的log讯息 
 */ 
 private function to_log($msg){ 
 if($this->_log){ 
 $msg = '['.date('Y-m-d H:i:s').']'.$msg."\r\n"; 
 file_put_contents($this->_log, $msg, FILE_APPEND); 
 } 
 } 
 
 /** hex颜色转rgb颜色 
 * @param String $color hex颜色 
 * @return Array 
 */ 
 private function hex2rgb($hexcolor){ 
 $color = str_replace('#', '', $hexcolor); 
 if (strlen($color) > 3) { 
 $rgb = array( 
 'r' => hexdec(substr($color, 0, 2)), 
 'g' => hexdec(substr($color, 2, 2)), 
 'b' => hexdec(substr($color, 4, 2)) 
 ); 
 } else { 
 $r = substr($color, 0, 1) . substr($color, 0, 1); 
 $g = substr($color, 1, 1) . substr($color, 1, 1); 
 $b = substr($color, 2, 1) . substr($color, 2, 1); 
 $rgb = array( 
 'r' => hexdec($r), 
 'g' => hexdec($g), 
 'b' => hexdec($b) 
 ); 
 } 
 return $rgb; 
 } 
 
 /** 获取图片类型 
 * @param String $file 图片路径 
 * @return int 
 */ 
 private function get_file_ext($file){ 
 $filename = basename($file); 
 list($name, $ext)= explode('.', $filename); 
 
 $ext_type = 0; 
 
 switch(strtolower($ext)){ 
 case 'jpg': 
 case 'jpeg': 
 $ext_type = 2; 
 break; 
 case 'gif': 
 $ext_type = 1; 
 break; 
 case 'png': 
 $ext_type = 3; 
 break; 
 } 
 return $ext_type; 
 } 
 
} // class end 
?>

demo示例代码如下：

<?php 
define('ROOT', dirname(__FILE__)); 
 
require(ROOT."/PicThumb.class.php"); 
 
$logfile = ROOT.'/PicThumb.log'; 
$source1 = ROOT.'/pic/source.jpg'; 
$dest1 = ROOT.'/pic/1.jpg'; 
$dest2 = ROOT.'/pic/2.gif'; 
$dest3 = ROOT.'/pic/3.png'; 
 
$source2 = ROOT.'/pic/source_cmyk.jpg'; 
$dest4 = ROOT.'/pic/4.jpg'; 
$dest5 = ROOT.'/pic/5.gif'; 
$dest6 = ROOT.'/pic/6.png'; 
 
$watermark = ROOT.'/pic/watermark.png'; 
 
// 按比例生成缩略图 
$param = array( 
 'type' => 'fit', 
 'width' => 100, 
 'height' => 100, 
); 
 
$obj = new PicThumb($logfile); 
$obj->set_config($param); 
$flag = $obj->create_thumb($source1, $dest1); 
 
if($flag){ 
 echo '<img src="pic/'.basename($dest1).'">'; 
}else{ 
 echo 'create thumb fail'; 
} 
 
// 按比例生成缩略图,不足部分用#FF0000填充 
$param = array( 
 'type' => 'fit', 
 'width' => 100, 
 'height' => 100, 
 'bgcolor' => '#FFFF00' 
); 
 
$obj = new PicThumb($logfile); 
$obj->set_config($param); 
$flag = $obj->create_thumb($source1, $dest2); 
 
if($flag){ 
 echo '<img src="pic/'.basename($dest2).'">'; 
}else{ 
 echo 'create thumb fail'; 
} 
 
// 裁剪250x250的缩略图,裁剪位置是底部中间,水印位置西南,透明度50 
$param = array( 
 'type' => 'crop', 
 'croppos' => 'BM', 
 'width' => 250, 
 'height' => 250, 
 'watermark' => $watermark, 
 'opacity' => 50, 
 'gravity' => 'SouthWest' 
); 
 
$obj = new PicThumb($logfile); 
$obj->set_config($param); 
$flag = $obj->create_thumb($source1, $dest3); 
 
if($flag){ 
 echo '<img src="pic/'.basename($dest3).'">'; 
}else{ 
 echo 'create thumb fail'; 
} 
 
// 按比例生成缩略图 CMYK格式 
$param = array( 
 'type' => 'fit', 
 'width' => 100, 
 'height' => 100, 
); 
 
$obj = new PicThumb($logfile); 
$obj->set_config($param); 
$flag = $obj->create_thumb($source2, $dest4); 
 
if($flag){ 
 echo '<img src="pic/'.basename($dest4).'">'; 
}else{ 
 echo 'create thumb fail'; 
} 
 
// 按比例生成缩略图,不足部分用#FF0000填充 CMYK格式 
$param = array( 
 'type' => 'fit', 
 'width' => 100, 
 'height' => 100, 
 'bgcolor' => '#FFFF00' 
); 
 
$obj = new PicThumb($logfile); 
$obj->set_config($param); 
$flag = $obj->create_thumb($source2, $dest5); 
 
if($flag){ 
 echo '<img src="pic/'.basename($dest5).'">'; 
}else{ 
 echo 'create thumb fail'; 
} 
 
// 裁剪250x250的缩略图,裁剪位置是底部中间,水印位置西南,透明度50 CMYK格式 
$param = array( 
 'type' => 'crop', 
 'croppos' => 'BM', 
 'width' => 250, 
 'height' => 250, 
 'watermark' => $watermark, 
 'opacity' => 50, 
 'gravity' => 'SouthWest' 
); 
 
$obj = new PicThumb($logfile); 
$obj->set_config($param); 
$flag = $obj->create_thumb($source2, $dest6); 
 
if($flag){ 
 echo '<img src="pic/'.basename($dest6).'">'; 
}else{ 
 echo 'create thumb fail'; 
} 
?>

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