php将图片保存为不同规格的图片_PHP教程

1.图片处理类.imagecls.php

 $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);
			$
                  middle_url=get_spec_image($data['image'],120,120,0);
			$big_url=get_spec_image($data['image'],200,200,0);

http://www.bkjia.com/PHPjc/371838.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/371838.htmlTechArticle1.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_c...