缩略图生成-php手册-php.cn

自动生成缩略图，支持裁切。调用方法简单：thumb.php?url=/yovae/data/userface/000/00/00/41_middle_face.jpg?1247718988&w=20&h=20
<?php /* * 自动缩略图参数 url|w|h|type="cut/full"|mark="text/image|r" * thumb.php?url=/yovae/data/userface/000/00/00/41_middle_face.jpg?1247718988&w=20&h=20 */ error_reporting(0); set_time_limit(30); $biggest_memory_limit = 256; //单位M，后缀不要加M //全局定义文件 //require 'define.inc.php'; //临时目录 $tempDir = "./data/thumb_temp/"; checkDir($tempDir); //分析URL $url = urldecode($_GET['url']); $url = preg_replace('/(.*)\?(.*)$/','$1',$url); //XSS脚本攻击探测 //include THINK_PATH.'/Vendor/xss.php'; //DetectXSS($url); //2009-10-7 修改将本地图片修改成相对地址，避免file_get_contents不能读取远程文件时出错（可修改php.ini 设置 allow_fopen_url 为 true） //$url = str_ireplace(SITE_URL,'.',$url); if(file_exists($url)){ $url = $url; }elseif($result = GrabImage($url,$tempDir)){ $url = $result; $grab_temp_file = $result; }else{ $url = "./Public/images/nopic.jpg"; } //解析参数 $w = $_GET['w']?intval($_GET['w']):'100'; //宽度 $h = $_GET['h']?intval($_GET['h']):'100'; //高度 $t = $_GET['t']=='f'?'f':'c'; //是否切割 $r = $_GET['r']?1:0; //是否覆盖 //目录名hash $fileHash = md5($url.$w.$h); $hashPath = substr($fileHash,0,2).'/'.substr($fileHash,2,2).'/'; //缩图目录 $thumbDir = "./data/thumb/".$hashPath; checkDir($thumbDir); if(!$sourceInfo['type']) $sourceInfo['type'] == 'jpg'; $tempFile = $tempDir.$fileHash.'.'.$sourceInfo['type']; $thumbFile = $thumbDir.$fileHash."_".$w."_".$h."_".$t.'.'.$sourceInfo['type']; $img = new Image(); //判断是否替换，存在则跳转，不存在继续进行 if(!$r && file_exists($thumbFile)){ //这里有2种方法，第一种多一次跳转，多一个http连接数，第二种，要进行一次php处理，多占用一部分内存。 //header('location:'.$thumbFile); $img->showImg($thumbFile); } //不存在输出 if(copy($url,$tempFile)){ //判断图片大小如果图片宽和高都小于要缩放的比例直接输出 $info = getimagesize($tempFile); //判断处理图片大约需要的内存 $need_memory = (($info[0]*$info[1])/100000); $memory_limit = ini_get('memory_limit'); if( ($need_memory > $memory_limit) && ($need_memory ini_set('memory_limit',$need_memory.'M'); } if($info[0] copy($tempFile,$thumbFile); $img->showImg($thumbFile,'',$info[0],$info[1]); unlink($tempFile); unlink($grab_temp_file); exit; }else{ //生成缩图 if($t=='c'){ $thumb = $img->cutThumb($tempFile,$thumbFile,$w,$h); }elseif($t=='f'){ $thumb = $img->thumb($tempFile,'',$thumbFile,$w,$h); } //输出缩图 $img->showImg($thumb,'',$w,$h); unlink($tempFile); unlink($grab_temp_file); exit; } } //获取远程图片 function GrabImage($url,$thumbDir) { if($url=="") return false; $filename = md5($url).strrchr($url,"."); $img = file_get_contents($url); if(!$img) return false; $filepath = $thumbDir.$filename; $result = file_put_contents($filepath,$img); if($result){ return $filepath; }else{ return false; } } //检查并创建多级目录 function checkDir($path){ $pathArray = explode('/',$path); $nowPath = ''; array_pop($pathArray); foreach ($pathArray as $key=>$value){ if ( ''==$value ){ unset($pathArray[$key]); }else{ if ( $key == 0 ) $nowPath .= $value; else $nowPath .= '/'.$value; if ( !is_dir($nowPath) ){ if ( !mkdir($nowPath, 0777) ) return false; } } } return true; } function imagecreatefrombmp($fname) { $buf=@file_get_contents($fname); if(strlen($buf) $file_header=unpack("sbfType/LbfSize/sbfReserved1/sbfReserved2/LbfOffBits",substr($buf,0,14)); if($file_header["bfType"]!=19778) return false; $info_header=unpack("LbiSize/lbiWidth/lbiHeight/sbiPlanes/sbiBitCountLbiCompression/LbiSizeImage/lbiXPelsPerMeter/lbiYPelsPerMeter/LbiClrUsed/LbiClrImportant",substr($buf,14,40)); if($info_header["biBitCountLbiCompression"]==2) return false; $line_len=round($info_header["biWidth"]*$info_header["biBitCountLbiCompression"]/8); $x=$line_len%4; if($x>0) $line_len+=4-$x; $img=imagecreatetruecolor($info_header["biWidth"],$info_header["biHeight"]); switch($info_header["biBitCountLbiCompression"]){ case 4: $colorset=unpack("L*",substr($buf,54,64)); for($y=0;$y $colors=array(); $y_pos=$y*$line_len+$file_header["bfOffBits"]; for($x=0;$x if($x%2) $colors[]=$colorset[(ord($buf[$y_pos+($x+1)/2])&0xf)+1]; else $colors[]=$colorset[((ord($buf[$y_pos+$x/2+1])>>4)&0xf)+1]; } imagesetstyle($img,$colors); imageline($img,0,$info_header["biHeight"]-$y-1,$info_header["biWidth"],$info_header["biHeight"]-$y-1,IMG_COLOR_STYLED); } break; case 8: $colorset=unpack("L*",substr($buf,54,1024)); for($y=0;$y $colors=array(); $y_pos=$y*$line_len+$file_header["bfOffBits"]; for($x=0;$x $colors[]=$colorset[ord($buf[$y_pos+$x])+1]; } imagesetstyle($img,$colors); imageline($img,0,$info_header["biHeight"]-$y-1,$info_header["biWidth"],$info_header["biHeight"]-$y-1,IMG_COLOR_STYLED); } break; case 16: for($y=0;$y $colors=array(); $y_pos=$y*$line_len+$file_header["bfOffBits"]; for($x=0;$x $i=$x*2; $color=ord($buf[$y_pos+$i])|(ord($buf[$y_pos+$i+1]) $colors[]=imagecolorallocate($img,(($color>>10)&0x1f)*0xff/0x1f,(($color>>5)&0x1f)*0xff/0x1f,($color&0x1f)*0xff/0x1f); } imagesetstyle($img,$colors); imageline($img,0,$info_header["biHeight"]-$y-1,$info_header["biWidth"],$info_header["biHeight"]-$y-1,IMG_COLOR_STYLED); } break; case 24: for($y=0;$y $colors=array(); $y_pos=$y*$line_len+$file_header["bfOffBits"]; for($x=0;$x $i=$x*3; $colors[]=imagecolorallocate($img,ord($buf[$y_pos+$i+2]),ord($buf[$y_pos+$i+1]),ord($buf[$y_pos+$i])); } imagesetstyle($img,$colors); imageline($img,0,$info_header["biHeight"]-$y-1,$info_header["biWidth"],$info_header["biHeight"]-$y-1,IMG_COLOR_STYLED); } break; default: return false; break; } return $img; } function imagebmp(&$im, $filename = '', $bit = 8, $compression = 0) { if (!in_array($bit, array(1, 4, 8, 16, 24, 32))) { $bit = 8; } else if ($bit == 32) // todo:32 bit { $bit = 24; } $bits = pow(2, $bit); // 调整调色板 imagetruecolortopalette($im, true, $bits); $width = imagesx($im); $height = imagesy($im); $colors_num = imagecolorstotal($im); if ($bit { // 颜色索引 $rgb_quad = ''; for ($i = 0; $i { $colors = imagecolorsforindex($im, $i); $rgb_quad .= chr($colors['blue']) . chr($colors['green']) . chr($colors['red']) . "\0"; } // 位图数据 $bmp_data = ''; // 非压缩 if ($compression == 0 || $bit { if (!in_array($bit, array(1, 4, 8))) { $bit = 8; } $compression = 0; // 每行字节数必须为4的倍数，补齐。 $extra = ''; $padding = 4 - ceil($width / (8 / $bit)) % 4; if ($padding % 4 != 0) { $extra = str_repeat("\0", $padding); } for ($j = $height - 1; $j >= 0; $j --) { $i = 0; while ($i { $bin = 0; $limit = $width - $i for ($k = 8 - $bit; $k >= $limit; $k -= $bit) { $index = imagecolorat($im, $i, $j); $bin |= $index $i ++; } $bmp_data .= chr($bin); } $bmp_data .= $extra; } } // RLE8 压缩 else if ($compression == 1 && $bit == 8) { for ($j = $height - 1; $j >= 0; $j --) { $last_index = "\0"; $same_num = 0; for ($i = 0; $i { $index = imagecolorat($im, $i, $j); if ($index !== $last_index || $same_num > 255) { if ($same_num != 0) { $bmp_data .= chr($same_num) . chr($last_index); } $last_index = $index; $same_num = 1; } else { $same_num ++; } } $bmp_data .= "\0\0"; } $bmp_data .= "\0\1"; } $size_quad = strlen($rgb_quad); $size_data = strlen($bmp_data); } else { // 每行字节数必须为4的倍数，补齐。 $extra = ''; $padding = 4 - ($width * ($bit / 8)) % 4; if ($padding % 4 != 0) { $extra = str_repeat("\0", $padding); } // 位图数据 $bmp_data = ''; for ($j = $height - 1; $j >= 0; $j --) { for ($i = 0; $i { $index = imagecolorat($im, $i, $j); $colors = imagecolorsforindex($im, $index); if ($bit == 16) { $bin = 0 $bin |= ($colors['red'] >> 3) $bin |= ($colors['green'] >> 3) $bin |= $colors['blue'] >> 3; $bmp_data .= pack("v", $bin); } else { $bmp_data .= pack("c*", $colors['blue'], $colors['green'], $colors['red']); } // todo: 32bit; } $bmp_data .= $extra; } $size_quad = 0; $size_data = strlen($bmp_data); $colors_num = 0; } // 位图文件头 $file_header = "BM" . pack("V3", 54 + $size_quad + $size_data, 0, 54 + $size_quad); // 位图信息头 $info_header = pack("V3v2V*", 0x28, $width, $height, 1, $bit, $compression, $size_data, 0, 0, $colors_num, 0); // 写入文件 if ($filename != '') { $fp = fopen("test.bmp", "wb"); fwrite($fp, $file_header); fwrite($fp, $info_header); fwrite($fp, $rgb_quad); fwrite($fp, $bmp_data); fclose($fp); return 1; } // 浏览器输出 header("Content-Type: image/bmp"); echo $file_header . $info_header; echo $rgb_quad; echo $bmp_data; return 1; } class Image {//类定义开始 /** +---------------------------------------------------------- * 架构函数 * +---------------------------------------------------------- * @access public +---------------------------------------------------------- */ function __construct() { } /** +---------------------------------------------------------- * 取得图像信息 * +---------------------------------------------------------- * @static * @access public +---------------------------------------------------------- * @param string $image 图像文件名 +---------------------------------------------------------- * @return mixed +---------------------------------------------------------- */ function getImageInfo($img) { $imageInfo = getimagesize($img); if( $imageInfo!== false) { if(function_exists(image_type_to_extension)){ $imageType = strtolower(substr(image_type_to_extension($imageInfo[2]),1)); }else{ $imageType = strtolower(substr($img,strrpos($img,'.')+1)); } $imageSize = filesize($img); $info = array( "width"=>$imageInfo[0], "height"=>$imageInfo[1], "type"=>$imageType, "size"=>$imageSize, "mime"=>$imageInfo['mime'] ); return $info; }else { return false; } } /** +---------------------------------------------------------- * 显示服务器图像文件 * 支持URL方式 +---------------------------------------------------------- * @static * @access public +---------------------------------------------------------- * @param string $imgFile 图像文件名 * @param string $text 文字字符串 * @param string $width 图像宽度 * @param string $height 图像高度 +---------------------------------------------------------- * @return void +---------------------------------------------------------- */ function showImg($imgFile,$text='',$width=80,$height=30) { //获取图像文件信息 //2007/6/26 增加图片水印输出，$text为图片的完整路径即可 $info = Image::getImageInfo($imgFile); if($info !== false) { $createFun = str_replace('/','createfrom',$info['mime']); $im = $createFun($imgFile); if($im) { $ImageFun= str_replace('/','',$info['mime']); //水印开始 if(!empty($text)) { $tc = imagecolorallocate($im, 0, 0, 0); if(is_file($text)&&file_exists($text)){ // 取得水印信息 $textInfo = Image::getImageInfo($text); $createFun2= str_replace('/','createfrom',$textInfo['mime']); $waterMark = $createFun2($text); $imgW = $info["width"]; $imgH = $info["width"]*$textInfo["height"]/$textInfo["width"]; $y = ($info["height"]-$textInfo["height"])/2; if(function_exists("ImageCopyResampled")) ImageCopyResampled($im,$waterMark,0,$y,0,0, $imgW,$imgH, $textInfo["width"],$textInfo["height"]); else ImageCopyResized($im,$waterMark,0,$y,0,0,$imgW,$imgH, $textInfo["width"],$textInfo["height"]); }else{ imagestring($im, 3, 5, 5, $text, $tc); } //ImageDestroy($tc); } //水印结束 if($info['type']=='png' || $info['type']=='gif') { imagealphablending($im, FALSE);//取消默认的混色模式 imagesavealpha($im,TRUE);//设定保存完整的 alpha 通道信息 } Header("Content-type: ".$info['mime']); $ImageFun($im); @ImageDestroy($im); return ; } } //获取或者创建图像文件失败则生成空白PNG图片 $im = imagecreatetruecolor($width, $height); $bgc = imagecolorallocate($im, 255, 255, 255); $tc = imagecolorallocate($im, 0, 0, 0); imagefilledrectangle($im, 0, 0, 150, 30, $bgc); imagestring($im, 4, 5, 5, "no pic", $tc); Image::output($im); return ; } // 切割缩图cutThumb // 2007/6/15 function cutThumb($image,$filename='',$maxWidth='200',$maxHeight='50',$warterMark='',$type='',$interlace=true,$suffix='_thumb') { // 获取原图信息 $info = Image::getImageInfo($image); if($info !== false) { $srcWidth = $info['width']; $srcHeight = $info['height']; $pathinfo = pathinfo($image); $type = $pathinfo['extension']; $type = empty($type)?$info['type']:$type; $type = strtolower($type); $interlace = $interlace? 1:0; unset($info); // 载入原图 $createFun = 'ImageCreateFrom'.($type=='jpg'?'jpeg':$type); $srcImg = $createFun($image); //创建缩略图 if($type!='gif' && function_exists('imagecreatetruecolor')) $thumbImg = imagecreatetruecolor($maxWidth, $maxHeight); else $thumbImg = imagecreate($maxWidth, $maxHeight); // 新建PNG缩略图通道透明处理 if('png'==$type) { imagealphablending($thumbImg, false);//取消默认的混色模式 imagesavealpha($thumbImg,true);//设定保存完整的 alpha 通道信息 }elseif('gif'==$type) { // 新建GIF缩略图预处理，保证透明效果不失效 $background_color = imagecolorallocate($thumbImg, 0,255,0); // 指派一个绿色 imagecolortransparent($thumbImg,$background_color); // 设置为透明色，若注释掉该行则输出绿色的图 } // 计算缩放比例 if(($maxWidth/$maxHeight)>=($srcWidth/$srcHeight)){ //宽不变,截高，从中间截取 y= $width = $srcWidth; $height = $srcWidth*($maxHeight/$maxWidth); $x = 0; $y = ($srcHeight-$height)*0.5; }else{ //高不变,截宽，从中间截取，x= $width = $srcHeight*($maxWidth/$maxHeight); $height = $srcHeight; $x = ($srcWidth-$width)*0.5; $y = 0; } // 复制图片 if(function_exists("ImageCopyResampled")){ ImageCopyResampled($thumbImg, $srcImg, 0, 0, $x, $y, $maxWidth, $maxHeight, $width,$height); }else{ ImageCopyResized($thumbImg, $srcImg, 0, 0, $x, $y, $maxWidth, $maxHeight, $width,$height); } ImageDestroy($srcImg); /*水印开始* / if($warterMark){ //计算水印的位置,默认居中 $textInfo = Image::getImageInfo($warterMark); $textW = $textInfo["width"]; $textH = $textInfo["height"]; unset($textInfo); $mark = imagecreatefrompng($warterMark); $imgW = $width; $imgH = $width*$textH/$textW; $y = ($height-$textH)/2; if(function_exists("ImageCopyResampled")){ ImageCopyResampled($thumbImg,$mark,0,$y,0,0, $imgW,$imgH, $textW,$textH); }else{ ImageCopyResized($thumbImg,$mark,0,$y,0,0,$imgW,$imgH, $textW,$textH); } ImageDestroy($mark); } /*水印结束*/ /*if('gif'==$type || 'png'==$type) { //imagealphablending($thumbImg, FALSE);//取消默认的混色模式 //imagesavealpha($thumbImg,TRUE);//设定保存完整的 alpha 通道信息 $background_color = ImageColorAllocate($thumbImg, 0,255,0); // 指派一个绿色 imagecolortransparent($thumbImg,$background_color); // 设置为透明色，若注释掉该行则输出绿色的图 }*/ // 对jpeg图形设置隔行扫描 if('jpg'==$type || 'jpeg'==$type) imageinterlace($thumbImg,$interlace); // 生成图片 //$imageFun = 'image'.($type=='jpg'?'jpeg':$type); $imageFun = 'imagepng'; $filename = empty($filename)? substr($image,0,strrpos($image, '.')).$suffix.'.'.$type : $filename; $imageFun($thumbImg,$filename); ImageDestroy($thumbImg); return $filename; } return false; } /** +---------------------------------------------------------- * 生成缩略图 * +---------------------------------------------------------- * @static * @access public +---------------------------------------------------------- * @param string $image 原图 * @param string $type 图像格式 * @param string $filename 缩略图文件名 * @param string $maxWidth 宽度 * @param string $maxHeight 高度 * @param string $position 缩略图保存目录 * @param boolean $interlace 启用隔行扫描 +---------------------------------------------------------- * @return void +---------------------------------------------------------- * @throws ThinkExecption +---------------------------------------------------------- */ //2007/7/18 添加水印缩略图 function thumb($image,$type='',$filename='',$maxWidth=200,$maxHeight=50,$warterMark='',$interlace=true,$suffix='_thumb') { // 获取原图信息 $info = Image::getImageInfo($image); if($info !== false) { $srcWidth = $info['width']; $srcHeight = $info['height']; $pathinfo = pathinfo($image); $type = $pathinfo['extension']; $type = empty($type)?$info['type']:$type; $type = strtolower($type); $interlace = $interlace? 1:0; unset($info); $scale = min($maxWidth/$srcWidth, $maxHeight/$srcHeight); // 计算缩放比例 // 缩略图尺寸 $width = (int)($srcWidth*$scale); $height = (int)($srcHeight*$scale); // 载入原图 $createFun = 'ImageCreateFrom'.($type=='jpg'?'jpeg':$type); $srcImg = $createFun($image); //创建缩略图 if($type!='gif' && function_exists('imagecreatetruecolor')) $thumbImg = imagecreatetruecolor($width, $height); else $thumbImg = imagecreate($width, $height); // 新建PNG缩略图通道透明处理 if('png'==$type) { imagealphablending($thumbImg, false);//取消默认的混色模式 imagesavealpha($thumbImg,true);//设定保存完整的 alpha 通道信息 }elseif('gif'==$type) { // 新建GIF缩略图预处理，保证透明效果不失效 $background_color = imagecolorallocate($thumbImg, 0,255,0); // 指派一个绿色 imagecolortransparent($thumbImg,$background_color); // 设置为透明色，若注释掉该行则输出绿色的图 } // 复制图片 if(function_exists("ImageCopyResampled")) ImageCopyResampled($thumbImg, $srcImg, 0, 0, 0, 0, $width, $height, $srcWidth,$srcHeight); else ImageCopyResized($thumbImg, $srcImg, 0, 0, 0, 0, $width, $height, $srcWidth,$srcHeight); ImageDestroy($srcImg); /* //水印开始 //计算水印的位置,默认居中 $textInfo = Image::getImageInfo($warterMark); $textW = $textInfo["width"]; $textH = $textInfo["height"]; unset($textInfo); $mark = imagecreatefrompng($warterMark); $imgW = $width; $imgH = $width*$textH/$textW; $y = ($height-$textH)/2; if(function_exists("ImageCopyResampled")){ ImageCopyResampled($thumbImg,$mark,0,$y,0,0, $imgW,$imgH, $textW,$textH); }else{ ImageCopyResized($thumbImg,$mark,0,$y,0,0,$imgW,$imgH, $textW,$textH); } ImageDestroy($mark); //水印结束 */ /*if('gif'==$type || 'png'==$type) { imagealphablending($thumbImg, FALSE);//取消默认的混色模式 imagesavealpha($thumbImg,TRUE);//设定保存完整的 alpha 通道信息 $background_color = ImageColorAllocate($thumbImg, 0,255,0);// 指派一个绿色 imagecolortransparent($thumbImg,$background_color);// 设置为透明色，若注释掉该行则输出绿色的图 }*/ if('jpg'==$type || 'jpeg'==$type) { imageinterlace($thumbImg,$interlace);// 对jpeg图形设置隔行扫描 } //&nbs