PHP，如何生成图片缩略图，或裁剪一部分？

为你提供一个图片上传类吧<?php
class UPImages {
 var $annexFolder = "annex";//附件存放点，默认为：annex
 var $smallFolder = "smallimg";//缩略图存放路径，注：必须是放在 $annexFolder下的子目录，默认为：smallimg
 var $Folder = "";//水印图片存放处
 var $upFileType = "jpg gif png";//上传的类型，默认为：jpg gif png rar zip
 var $upFileMax = 1024;//上传大小限制，单位是“KB”，默认为：1024KB
 var $fontType;//字体
 var $maxWidth = 500; //图片最大宽度
 var $maxHeight = 600; //图片最大高度
 function UPImages($annexFolder,$smallFolder,$includeFolder) {
 $this->annexFolder = $annexFolder;
 $this->smallFolder = $smallFolder;
 $this->fontType = $includeFolder."/04B_08__.TTF";
 }
 function upLoad($inputName) {
 $imageName = time();//设定当前时间为图片名称
 if(@empty($_FILES[$inputName]["name"])) die("没有上传图片信息，请确认");
 $name = explode(".",$_FILES[$inputName]["name"]);//将上传前的文件以“.”分开取得文件类型
 $imgCount = count($name);//获得截取的数量
 $imgType = $name[$imgCount-1];//取得文件的类型
 if(strpos($this->upFileType,$imgType) === false) die("上传文件类型仅支持 ".$this->upFileType." 不支持 ".$imgType);
 $photo = $imageName.".".$imgType;//写入数据库的文件名
 $uploadFile = $this->annexFolder."/".$photo;//上传后的文件名称
 $upFileok = move_uploaded_file($_FILES[$inputName]["tmp_name"],$uploadFile);
 if($upFileok) {
 $imgSize = $_FILES[$inputName]["size"];
 $kSize = round($imgSize/1024);
 if($kSize > ($this->upFileMax*1024)) {
 @unlink($uploadFile);
 die("上传文件超过 ".$this->upFileMax."KB");
 }
 } else {
 die("上传图片失败，请确认你的上传文件不超过 $upFileMax KB 或上传时间超时");
 }
 return $photo;
 }
 function getInfo($photo) {
 $photo = $this->annexFolder."/".$photo;
 $imageInfo = getimagesize($photo);
 $imgInfo["width"] = $imageInfo[0];
 $imgInfo["height"] = $imageInfo[1];
 $imgInfo["type"] = $imageInfo[2];
 $imgInfo["name"] = basename($photo);
 return $imgInfo;
 }
 function smallImg($photo,$width=128,$height=128) {
 $imgInfo = $this->getInfo($photo);
 $photo = $this->annexFolder."/".$photo;//获得图片源
 $newName = substr($imgInfo["name"],0,strrpos($imgInfo["name"], "."))."_thumb.jpg";//新图片名称
 if($imgInfo["type"] == 1) {
 $img = imagecreatefromgif($photo);
 } elseif($imgInfo["type"] == 2) {
 $img = imagecreatefromjpeg($photo);
 } elseif($imgInfo["type"] == 3) {
 $img = imagecreatefrompng($photo);
 } else {
 $img = "";
 }
 if(empty($img)) return False;
 $width = ($width > $imgInfo["width"]) ? $imgInfo["width"] : $width;
 $height = ($height > $imgInfo["height"]) ? $imgInfo["height"] : $height;
 $srcW = $imgInfo["width"];
 $srcH = $imgInfo["height"];
 if ($srcW * $width > $srcH * $height) {
 $height = round($srcH * $width / $srcW);
 } else {
 $width = round($srcW * $height / $srcH);
 }
 if (function_exists("imagecreatetruecolor")) {
 $newImg = imagecreatetruecolor($width, $height);
 ImageCopyResampled($newImg, $img, 0, 0, 0, 0, $width, $height, $imgInfo["width"], $imgInfo["height"]);
 } else {
 $newImg = imagecreate($width, $height);
 ImageCopyResized($newImg, $img, 0, 0, 0, 0, $width, $height, $imgInfo["width"], $imgInfo["height"]);
 }
 if ($this->toFile) {
 if (file_exists($this->annexFolder."/".$this->smallFolder."/".$newName)) @unlink($this->annexFolder."/".$this->smallFolder."/".$newName);
 ImageJPEG($newImg,$this->annexFolder."/".$this->smallFolder."/".$newName);
 return $this->annexFolder."/".$this->smallFolder."/".$newName;
 } else {
 ImageJPEG($newImg);
 }
 ImageDestroy($newImg);
 ImageDestroy($img);
 return $newName;
 }
 function waterMark($photo,$text) {
 $imgInfo = $this->getInfo($photo);
 $photo = $this->annexFolder."/".$photo;
 $newName = substr($imgInfo["name"], 0, strrpos($imgInfo["name"], ".")) . "_.jpg";
 switch ($imgInfo["type"]) {
 case 1:
 $img = imagecreatefromgif($photo);
 break;
 case 2:
 $img = imagecreatefromjpeg($photo);
 break;
 case 3:
 $img = imagecreatefrompng($photo);
 break;
 default:
 return False;
 }
 if (empty($img)) return False;
 $width = ($this->maxWidth > $imgInfo["width"]) ? $imgInfo["width"] : $this->maxWidth;
 $height = ($this->maxHeight > $imgInfo["height"]) ? $imgInfo["height"] : $this->maxHeight;
 $srcW = $imgInfo["width"];
 $srcH = $imgInfo["height"];
 if ($srcW * $width > $srcH * $height) {
 $height = round($srcH * $width / $srcW);
 } else {
 $width = round($srcW * $height / $srcH);
 }
 if (function_exists("imagecreatetruecolor")) {
 $newImg = imagecreatetruecolor($width, $height);
 ImageCopyResampled($newImg, $img, 0, 0, 0, 0, $width, $height, $imgInfo["width"], $imgInfo["height"]);
 } else {
 $newImg = imagecreate($width, $height);
 ImageCopyResized($newImg, $img, 0, 0, 0, 0, $width, $height, $imgInfo["width"], $imgInfo["height"]);
 }

 $white = imageColorAllocate($newImg, 255, 255, 255);
 $black = imageColorAllocate($newImg, 0, 0, 0);
 $alpha = imageColorAllocateAlpha($newImg, 230, 230, 230, 40);
 ImageFilledRectangle($newImg, 0, $height-26, $width, $height, $alpha);
 ImageFilledRectangle($newImg, 13, $height-20, 15, $height-7, $black);
 ImageTTFText($newImg, 4.9, 0, 20, $height-14, $black, $this->fontType, $text[0]);
 ImageTTFText($newImg, 4.9, 0, 20, $height-6, $black, $this->fontType, $text[1]);
 if($this->toFile) {
 if (file_exists($this->annexFolder."/".$this->Folder."/".$newName)) @unlink($this->annexFolder."/".$this->Folder."/".$newName);
 ImageJPEG($newImg,$this->annexFolder."/".$this->Folder."/".$newName);
 return $this->annexFolder."/".$this->Folder."/".$newName;
 } else {
 ImageJPEG($newImg);
 }
 ImageDestroy($newImg);
 ImageDestroy($img);
 return $newName;
 }
}
?>

使用方法如下（可以解决你的问题）：<?php
$annexFolder = "annex";
$smallFolder = "smallimg";
$Folder = "";
$includeFolder = "include";
require("./".$includeFolder."/upfile.php");$img = new UPImages($annexFolder,$smallFolder,$includeFolder);
$text = array("www.dananwa.com.cn","all rights reserved");
$photo = $img->upLoad("upfile");
$img->maxWidth = $img->maxHeight = 500;//设置生成水印图的大小(单位像素，自动适应大小不会造成变形)
$img->toFile = true;
$newSmallImg = $img->smallImg($photo,300,200);
$newMark = $img->waterMark($photo,$text);
echo "小图预览： <img src='".$newSmallImg."' border='0'> ";
echo "水印图预览： <img src='".$newMark."' border='0'> ";
?>

楼主的要求是可以实现的../*
**裁切图片并生成新图片函数
*
*$orgpath——原图片路径images/upload/2006/2006-12/2006-12-27/IMG_0151.gif
$objpath——目标图片路径images/upload/2006/2006-12/2006-12-27/IMG_0153.gif
*$x——裁切的起点X坐标
*$y——裁切的起点Y坐标
*$width——裁切的宽度
*$height——裁切的高度
*/function createcutphoto($orgpath,$objpath,$x,$y,$width,$height)
{
   list($owidth,$oheight) = getimagesize($orgpath);
   $n_image = imagecreatetruecolor($width,$height);
   $image = imagecreatefromjpeg($orgpath);
   @imagecopyresampled($n_image,$image,0,0,$x,$y,$owidth,$oheight,$owidth,$oheight);
   @imagejpeg($n_image,$objpath,100);
}

有个叫thumb.class.php的类应该可以实现LZ的要求
这个类生成缩略图，给图片加边框，水印，裁减都可以实现。

调试易

PHP，如何生成图片缩略图，或裁剪一部分？

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