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:点击查看
PicThumb.class.php
<?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":
$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;
}
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."
";
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:
<?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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