php将图片保存为不同尺寸图片的图片类实例


            本文实例讲述了php将图片保存为不同规格的图片类。分享给大家供大家参考。具体如下：

图片处理类.imagecls.php如下：





<?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;

    }

  }

}

?>



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







//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);



希望本文所述对大家的php程序设计有所帮助。