php 将图片保存为不同规格的图片

 1.图片处理类.imagecls.php

<?php
/**
    图片处理类
 */
class imagecls
{
    /**
     * 文件信息
     */
    var $file = array();
    /**
     * 保存目录
     */
    var $dir = '';
    /**
     * 错误代码
     */
    var $error_code = 0;
    /**
     * 文件上传最大KB
     */
    var $max_size = -1;

    function es_imagecls()
    {

    }

    private function checkSize($size)
    {
        return !($size > $this->max_size) || (-1 == $this->max_size);
    }

    /**
     * 处理上传文件
     * @param array $file 上传的文件
     * @param string $dir 保存的目录
     * @return bool
     */
    function init($file, $dir = 'temp')
    {
        if(!is_array($file) || empty($file)
   || !$this->isUploadFile($file['tmp_name']) || trim($file['name']) == '' || $file['size'] == 0)
        {
            $this->file = array();
            $this->error_code = -1;
            return false;
        }
        else
{
$file['size'] = intval($file['size']);
$file['name'] =  trim($file['name']);
$file['thumb'] = '';
$file['ext'] = $this->fileExt($file['name']);
$file['name'] =  htmlspecialchars($file['name'], ENT_QUOTES);
$file['is_image'] = $this->isImageExt($file['ext']);
$file['file_dir'] = $this->getTargetDir($dir);
$file['prefix'] = md5(microtime(true)).rand(10,99);
$file['target'] = "./public/".$file['file_dir'].'/'.$file['prefix'].'.jpg';  //相对
$file['local_target'] = APP_ROOT_PATH."public/".$file['file_dir'].'/'.$file['prefix'].'.jpg';//物理
    $this->file = &$file;

            $this->error_code = 0;
            return true;
        }

    }

    /**
     * 保存文件
     * @return bool
     */
    function save()
    {
        if(empty($this->file) || empty($this->file['tmp_name']))
            $this->error_code = -101;
        elseif(!$this->checkSize($this->file['size']))
            $this->error_code = -105;
        elseif(!$this->file['is_image'])
            $this->error_code = -102;
        elseif(!$this->saveFile($this->file['tmp_name'], $this->file['local_target']))
            $this->error_code = -103;
                  elseif($this->file['is_image'] &&
          (!$this->file['image_info'] = $this->getImageInfo($this->file['local_target'], true)))
        {
            $this->error_code = -104;
            @unlink($this->file['local_target']);
        }
        else
        {
            $this->error_code = 0;
            return true;
        }
        return false;
    }

    /**
     * 获取错误代码
     * @return number
     */
    function error()
    {
        return $this->error_code;
    }

    /**
     * 获取文件扩展名
     * @return string
     */
    function fileExt($file_name)
    {
        return addslashes(strtolower(substr(strrchr($file_name, '.'), 1, 10)));
    }

    /**
     * 根据扩展名判断文件是否为图像
     * @param string $ext 扩展名
     * @return bool
     */
    function isImageExt($ext)
    {
        static $img_ext  = array('jpg', 'jpeg', 'png', 'bmp','gif','giff');
        return in_array($ext, $img_ext) ? 1 : 0;
    }

    /**
     * 获取图像信息
     * @param string $target 文件路径
     * @return mixed
     */
    function getImageInfo($target)
    {
        $ext = es_imagecls::fileExt($target);
        $is_image = es_imagecls::isImageExt($ext);

        if(!$is_image)
            return false;
        elseif(!is_readable($target))
            return false;
        elseif($image_info = @getimagesize($target))
        {
            list($width, $height, $type) = !empty($image_info) ? $image_info :
                           array('', '', '');
            $size = $width * $height;
            if($is_image && !in_array($type, array(1,2,3,6,13)))
                return false;

            $image_info['type'] =
                       strtolower (substr(image_type_to_extension($image_info[2]),1));
            return $image_info;
        }
        else
            return false;
    }

    /**
     * 获取是否充许上传文件
     * @param string $source 文件路径
     * @return bool
     */
    function isUploadFile($source)
    {
        return $source && ($source != 'none') &&
          (is_uploaded_file($source) || is_uploaded_file(str_replace('', '', $source)));
    }

    /**
     * 获取保存的路径
     * @param string $dir 指定的保存目录
     * @return string
     */
    function getTargetDir($dir)
    {
        if (!is_dir(APP_ROOT_PATH."public/".$dir)) {
             @mkdir(APP_ROOT_PATH."public/".$dir);
             @chmod(APP_ROOT_PATH."public/".$dir, 0777);
        }
        return $dir;
    }

    /**
     * 保存文件
     * @param string $source 源文件路径
     * @param string $target 目录文件路径
     * @return bool
     */
    private function saveFile($source, $target)
    {
        if(!es_imagecls::isUploadFile($source))
            $succeed = false;
        elseif(@copy($source, $target))
            $succeed = true;
        elseif(function_exists('move_uploaded_file') &&
                     @move_uploaded_file($source, $target))
            $succeed = true;
        elseif (@is_readable($source) &&
                   (@$fp_s = fopen($source, 'rb')) && (@$fp_t = fopen($target, 'wb')))
        {
            while (!feof($fp_s))
            {
                $s = @fread($fp_s, 1024 * 512);
                @fwrite($fp_t, $s);
            }
            fclose($fp_s);
            fclose($fp_t);
            $succeed = true;
        }

        if($succeed)
        {
            $this->error_code = 0;
            @chmod($target, 0644);
            @unlink($source);
        }
        else
        {
            $this->error_code = 0;
        }

        return $succeed;
    }

    public function thumb($image,$maxWidth=200,$maxHeight=50,$gen = 0,
          $interlace=true,$filepath = '',$is_preview = true)
    {
        $info  = es_imagecls::getImageInfo($image);

        if($info !== false)
        {
            $srcWidth  = $info[0];
            $srcHeight = $info[1];
            $type = $info['type'];

            $interlace  =  $interlace? 1:0;
            unset($info);

            if($maxWidth > 0 && $maxHeight > 0)
            $scale = min($maxWidth/$srcWidth, $maxHeight/$srcHeight);
                                // 计算缩放比例
            elseif($maxWidth == 0)
                $scale = $maxHeight/$srcHeight;
            elseif($maxHeight == 0)
                $scale = $maxWidth/$srcWidth;


            $paths = pathinfo($image);
            $paths['filename'] = trim(strtolower($paths['basename']),
                            ".".strtolower($paths['extension']));
            $basefilename = explode("_",$paths['filename']);
            $basefilename = $basefilename[0];
            if(empty($filepath))
            {
                if($is_preview)
                $thumbname = $paths['dirname'].'/'.$basefilename.
                                     '_'.$maxWidth.'x'.$maxHeight.'.jpg';
                else
                $thumbname = $paths['dirname'].'/'.$basefilename.
                                     'o_'.$maxWidth.'x'.$maxHeight.'.jpg';
            }
            else
                $thumbname = $filepath;

            $thumburl = str_replace(APP_ROOT_PATH,'./',$thumbname);

            if($scale >= 1)
            {
                // 超过原图大小不再缩略
                $width   =  $srcWidth;
                $height  =  $srcHeight;
                if(!$is_preview)
                {
                    //非预览模式写入原图
                    file_put_contents($thumbname,file_get_contents($image));    //用原图写入
                    return array('url'=>$thumburl,'path'=>$thumbname);
                }
            }
            else
            {
                // 缩略图尺寸
                $width  = (int)($srcWidth*$scale);
                $height = (int)($srcHeight*$scale);
            }

            if($gen == 1)
            {
                $width = $maxWidth;
                $height = $maxHeight;
            }

            // 载入原图
            $createFun = 'imagecreatefrom'.($type=='jpg'?'jpeg':$type);
            if(!function_exists($createFun))
                $createFun = 'imagecreatefromjpeg';

            $srcImg = $createFun($image);

            //创建缩略图
            if($type!='gif' && function_exists('imagecreatetruecolor'))
                $thumbImg = imagecreatetruecolor($width, $height);
            else
                $thumbImg = imagecreate($width, $height);

            $x = 0;
            $y = 0;

            if($gen == 1 && $maxWidth > 0 && $maxHeight > 0)
            {
                $resize_ratio = $maxWidth/$maxHeight;
                $src_ratio = $srcWidth/$srcHeight;
                if($src_ratio >= $resize_ratio)
                {
                $x = ($srcWidth - ($resize_ratio * $srcHeight)) / 2;
                $width = ($height * $srcWidth) / $srcHeight;
                }
                else
                {
                $y = ($srcHeight - ( (1 / $resize_ratio) * $srcWidth)) / 2;
                $height = ($width * $srcHeight) / $srcWidth;
                }
            }

            // 复制图片
            if(function_exists("imagecopyresampled"))
                imagecopyresampled($thumbImg, $srcImg, 0, 0, $x, $y, $width, $height,
               $srcWidth,$srcHeight);
            else
                imagecopyresized($thumbImg, $srcImg, 0, 0, $x, $y, $width, $height,
             $srcWidth,$srcHeight);
            if('gif'==$type || 'png'==$type) {
                $background_color  =  imagecolorallocate($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
            imagejpeg($thumbImg,$thumbname,100);
            imagedestroy($thumbImg);
            imagedestroy($srcImg);

            return array('url'=>$thumburl,'path'=>$thumbname);
         }
         return false;
    }

    public function make_thumb($srcImg,$srcWidth,$srcHeight,$type,$maxWidth=200,
         $maxHeight=50,$gen = 0)
    {

            $interlace  =  $interlace? 1:0;

            if($maxWidth > 0 && $maxHeight > 0)
                $scale = min($maxWidth/$srcWidth, $maxHeight/$srcHeight);
                                       // 计算缩放比例
            elseif($maxWidth == 0)
                $scale = $maxHeight/$srcHeight;
            elseif($maxHeight == 0)
                $scale = $maxWidth/$srcWidth;

            if($scale >= 1)
            {
                // 超过原图大小不再缩略
                $width   =  $srcWidth;
                $height  =  $srcHeight;
            }
            else
            {
                // 缩略图尺寸
                $width  = (int)($srcWidth*$scale);
                $height = (int)($srcHeight*$scale);
            }

            if($gen == 1)
            {
                $width = $maxWidth;
                $height = $maxHeight;
            }


            //创建缩略图
            if($type!='gif' && function_exists('imagecreatetruecolor'))
                $thumbImg = imagecreatetruecolor($width, $height);
            else
                $thumbImg = imagecreatetruecolor($width, $height);

            $x = 0;
            $y = 0;

            if($gen == 1 && $maxWidth > 0 && $maxHeight > 0)
            {
                $resize_ratio = $maxWidth/$maxHeight;
                $src_ratio = $srcWidth/$srcHeight;
                if($src_ratio >= $resize_ratio)
                {
                $x = ($srcWidth - ($resize_ratio * $srcHeight)) / 2;
                $width = ($height * $srcWidth) / $srcHeight;
                }
                else
                {
                $y = ($srcHeight - ( (1 / $resize_ratio) * $srcWidth)) / 2;
                $height = ($width * $srcHeight) / $srcWidth;
                }
            }

            // 复制图片
            if(function_exists("imagecopyresampled"))
                imagecopyresampled($thumbImg, $srcImg, 0, 0, $x, $y, $width, $height,
                    $srcWidth,$srcHeight);
            else
                imagecopyresized($thumbImg, $srcImg, 0, 0, $x, $y, $width, $height,
                  $srcWidth,$srcHeight);
            if('gif'==$type || 'png'==$type) {
                $background_color  =  imagecolorallocate($thumbImg,  255,255,255);
                //  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);

           return $thumbImg;


    }

    public function water($source,$water,$alpha=80,$position="0")
    {
        //检查文件是否存在
        if(!file_exists($source)||!file_exists($water))
            return false;

        //图片信息
        $sInfo = es_imagecls::getImageInfo($source);
        $wInfo = es_imagecls::getImageInfo($water);

        //如果图片小于水印图片，不生成图片
        if($sInfo["0"] < $wInfo["0"] || $sInfo['1'] < $wInfo['1'])
            return false;



        if(is_animated_gif($source))
        {
            require_once APP_ROOT_PATH."system/utils/gif_encoder.php";
            require_once APP_ROOT_PATH."system/utils/gif_reader.php";

            $gif = new GIFReader();
            $gif->load($source);
            foreach($gif->IMGS['frames'] as $k=>$img)
            {
                $im = imagecreatefromstring($gif->getgif($k));
                //为im加水印
                $sImage=$im;
                $wCreateFun="imagecreatefrom".$wInfo['type'];
                if(!function_exists($wCreateFun))
                    $wCreateFun = 'imagecreatefromjpeg';
                $wImage=$wCreateFun($water);

                //设定图像的混色模式
                imagealphablending($wImage, true);
                switch (intval($position))
                {
                    case 0: break;
                    //左上
                    case 1:
                        $posY=0;
                        $posX=0;
                        //生成混合图像
    imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
                        break;
                    //右上
                    case 2:
                        $posY=0;
                        $posX=$sInfo[0]-$wInfo[0];
                        //生成混合图像
    imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
                        break;
                    //左下
                    case 3:
                        $posY=$sInfo[1]-$wInfo[1];
                        $posX=0;
                        //生成混合图像
    imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
                        break;
                    //右下
                    case 4:
                        $posY=$sInfo[1]-$wInfo[1];
                        $posX=$sInfo[0]-$wInfo[0];
                        //生成混合图像
    imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
                        break;
                    //居中
                    case 5:
                        $posY=$sInfo[1]/2-$wInfo[1]/2;
                        $posX=$sInfo[0]/2-$wInfo[0]/2;
                        //生成混合图像
    imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
                        break;
                }
                //end im加水印


                ob_start();
                imagegif($sImage);
                $content = ob_get_contents();
                ob_end_clean();
                $frames [ ] = $content;
                $framed [ ] = $img['frameDelay'];
            }


            $gif_maker = new GIFEncoder (
                   $frames,
                   $framed,
                   0,
                   2,
                   0, 0, 0,
                   "bin"   //bin为二进制   url为地址
              );
            $image_rs = $gif_maker->GetAnimation ( );

            //如果没有给出保存文件名，默认为原图像名
            @unlink($source);
            //保存图像
            file_put_contents($source,$image_rs);
            return true;
        }

        //建立图像
        $sCreateFun="imagecreatefrom".$sInfo['type'];
        if(!function_exists($sCreateFun))
            $sCreateFun = 'imagecreatefromjpeg';
        $sImage=$sCreateFun($source);

        $wCreateFun="imagecreatefrom".$wInfo['type'];
        if(!function_exists($wCreateFun))
            $wCreateFun = 'imagecreatefromjpeg';
        $wImage=$wCreateFun($water);

        //设定图像的混色模式
        imagealphablending($wImage, true);

        switch (intval($position))
        {
            case 0: break;
            //左上
            case 1:
                $posY=0;
                $posX=0;
                //生成混合图像
    imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
                break;
            //右上
            case 2:
                $posY=0;
                $posX=$sInfo[0]-$wInfo[0];
                //生成混合图像
    imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
                break;
            //左下
            case 3:
                $posY=$sInfo[1]-$wInfo[1];
                $posX=0;
                //生成混合图像
    imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
                break;
            //右下
            case 4:
                $posY=$sInfo[1]-$wInfo[1];
                $posX=$sInfo[0]-$wInfo[0];
                //生成混合图像
    imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
                break;
            //居中
            case 5:
                $posY=$sInfo[1]/2-$wInfo[1]/2;
                $posX=$sInfo[0]/2-$wInfo[0]/2;
                //生成混合图像
     imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
                break;
        }

        //如果没有给出保存文件名，默认为原图像名
        @unlink($source);
        //保存图像
        imagejpeg($sImage,$source,100);
        imagedestroy($sImage);
    }
}

if(!function_exists('image_type_to_extension'))
{
    function image_type_to_extension($imagetype)
    {
        if(empty($imagetype))
            return false;

        switch($imagetype)
        {
            case IMAGETYPE_GIF    : return '.gif';
            case IMAGETYPE_JPEG   : return '.jpeg';
            case IMAGETYPE_PNG    : return '.png';
            case IMAGETYPE_SWF    : return '.swf';
            case IMAGETYPE_PSD    : return '.psd';
            case IMAGETYPE_BMP    : return '.bmp';
            case IMAGETYPE_TIFF_II : return '.tiff';
            case IMAGETYPE_TIFF_MM : return '.tiff';
            case IMAGETYPE_JPC    : return '.jpc';
            case IMAGETYPE_JP2    : return '.jp2';
            case IMAGETYPE_JPX    : return '.jpf';
            case IMAGETYPE_JB2    : return '.jb2';
            case IMAGETYPE_SWC    : return '.swc';
            case IMAGETYPE_IFF    : return '.aiff';
            case IMAGETYPE_WBMP   : return '.wbmp';
            case IMAGETYPE_XBM    : return '.xbm';
            default               : return false;
        }
    }
}
?>
<p>2.get_spec_img()调用图片类,然后再用下面的方法保存不同规格的图片并返回图片连接</p><pre class="code">
//获取相应规格的图片地址
//gen=0:保持比例缩放，不剪裁,如高为0，则保证宽度按比例缩放  gen=1：保证长宽，剪裁
function get_spec_image($img_path,$width=0,$height=0,$gen=0,$is_preview=true)
{
    if($width==0)
        $new_path = $img_path;
    else
    {
        $img_name = substr($img_path,0,-4);
        $img_ext = substr($img_path,-3);
        if($is_preview)
        $new_path = $img_name."_".$width."x".$height.".jpg";
        else
        $new_path = $img_name."o_".$width."x".$height.".jpg";
        if(!file_exists($new_path))
        {
            require_once "imagecls.php";
            $imagec = new imagecls();
            $thumb = $imagec->thumb($img_path,$width,$height,$gen,true,"
                           ",$is_preview);

            if(app_conf("PUBLIC_DOMAIN_ROOT")!='')
            {
                $paths = pathinfo($new_path);
                $path = str_replace("./","",$paths['dirname']);
                $filename = $paths['basename'];
                $pathwithoupublic = str_replace("public/","",$path);

                        $file_data = @file_get_contents($path.$file);
　 　                   $img = @imagecreatefromstring($file_data);
　 　                   if($img!==false)
　 　                   {
　 　  　                  $save_path = "public/".$path;
　 　  　                  if(!is_dir($save_path))
　 　  　                  {
　 　  　  　                   @mk_dir($save_path);
　 　  　                  }
　 　  　                  @file_put_contents($save_path.$name,$file_data);
　 　                   }
            }

        }
    }
    return $new_path;
}

3.使用方法:

//im:将店铺图片保存为3种规格:小图:48x48,中图120x120,大图200x200
            $small_url=get_spec_image($data['image'],48,48,0);
            $<span id="result_box" class="short_text" lang="en">
                  <span>middle_url</span></span>=get_spec_image($data['image'],120,120,0);
            $big_url=get_spec_image($data['image'],200,200,0);