php实现的支持imagemagick及gd库两种处理的缩略图生成类

php  /  管理员 发布于 7年前   288

本文实例讲述了php实现的支持imagemagick及gd库两种处理的缩略图生成类及其用法实例，非常具有实用价值。分享给大家供大家参考。具体如下：

一、功能:

1.按比例缩小/放大
2.填充背景色
3.按区域裁剪
4.添加水印，包括水印的位置，透明度等

使用imagemagick/GD库实现，imagemagick地址：www.imagemagick.org
需要安装imagemagick，安装方法如下：55528.htm

二、实现方法：

PicThumb.class.php类文件如下：

_log = $logfile;     }   }    // 设置参数   public function set_config($param=array()){     $this->_handler = $this->exists($param, 'handler')? strtolower($param['handler']) : null;     $this->_type = $this->exists($param, 'type')? strtolower($param['type']) : 'fit';     $this->_watermark = $this->exists($param, 'watermark')? $param['watermark'] : null;     $this->_opacity = $this->exists($param, 'opacity')? $param['opacity'] : 75;     $this->_gravity = $this->exists($param, 'gravity')? $param['gravity'] : 'SouthEast';     $this->_geometry = $this->exists($param, 'geometry')? $param['geometry'] : '+10+10';     $this->_croppos = $this->exists($param, 'croppos')? $param['croppos'] : 'TL';     $this->_bgcolor = $this->exists($param, 'bgcolor')? $param['bgcolor'] : null;     $this->_quality = $this->exists($param, 'quality')? $param['quality'] : 90;     $this->_width = $this->exists($param, 'width')? $param['width'] : null;     $this->_height = $this->exists($param, 'height')? $param['height'] : null;   }    /** 创建缩略图   * @param String $source 原图   * @param String $dest  目标图   * @return boolean   */   public function create_thumb($source, $dest){     // 检查使用的handler是否已安装     if(!$this->check_handler()){       $this->to_log('handler not installed');       return false;     }     // 判断区域宽高是否正确     if(!is_numeric($this->_width) || !is_numeric($this->_height) || $this->_width<=0 || $this->_height<=0){       $this->to_log('width or height invalid');       return false;     }      // 判断源文件是否存在     if(!file_exists($source)){       $this->to_log($source.' not exists');       return false;     }      // 创建目标文件路径     if(!$this->create_dirs($dest)){       $this->to_log(dirname($dest).' create fail');       return false;     }      $this->_source = $source;  // 源文件     $this->_dest = $dest;    // 目标文件      // 处理图片     switch($this->_type){       case 'fit':         if($this->_handler=='imagemagick'){           return $this->fit();         }else{           return $this->gd_fit();         }         break;        case 'crop':         if($this->_handler=='imagemagick'){           return $this->crop();         }else{           return $this->gd_crop();         }         break;        default:         $this->to_log($this->_type.' not fit and crop');         return false;     }   }    /** 按比例压缩或拉伸图片   * @return boolean   */   private function fit(){      // 判断是否填充背景     $bgcolor = ($this->_bgcolor!=null)?      sprintf(" -background '%s' -gravity center -extent '%sx%s' ", $this->_bgcolor, $this->_width, $this->_height) : "";      // 判断是否要转为RGB     $source_info = getimagesize($this->_source);     $colorspace = (!isset($source_info['channels']) || $source_info['channels']!=3)? ' -colorspace RGB ' : '';      // 命令行     $cmd = sprintf("convert -resize '%sx%s' '%s' %s -quality %s %s '%s'", $this->_width, $this->_height, $this->_source, $bgcolor, $this->_quality, $colorspace, $this->_dest);      // 记录执行的命令     $this->to_log($cmd);      // 执行命令     exec($cmd);      // 添加水印     $this->add_watermark($this->_dest);      return is_file($this->_dest)? true : false;   }    /** 裁剪图片   * @return boolean   */   private function crop(){     // 获取生成的图片尺寸     list($pic_w, $pic_h) = $this->get_size();      // 获取截图的偏移量     list($offset_w, $offset_h) = $this->get_crop_offset($pic_w, $pic_h);      // 判断是否要转为RGB     $source_info = getimagesize($this->_source);     $colorspace = (!isset($source_info['channels']) || $source_info['channels']!=3)? ' -colorspace RGB ' : '';      // 命令行     $cmd = sprintf("convert -resize '%sx%s' '%s' -quality %s %s -crop %sx%s+%s+%s +repage '%s'", $pic_w, $pic_h, $this->_source, $this->_quality, $colorspace, $this->_width, $this->_height, $offset_w, $offset_h, $this->_dest);      // 记录执行的命令     $this->to_log($cmd);      // 执行命令     exec($cmd);      // 添加水印     $this->add_watermark($this->_dest);      return is_file($this->_dest)? true : false;   }    /** GD库按比例压缩或拉伸图片   * @return boolean   */   private function gd_fit(){     // 获取生成的图片尺寸     list($pic_w, $pic_h) = $this->get_size();      list($owidth, $oheight, $otype) = getimagesize($this->_source);      switch($otype){       case 1: $source_img = imagecreatefromgif($this->_source); break;       case 2: $source_img = imagecreatefromjpeg($this->_source); break;       case 3: $source_img = imagecreatefrompng($this->_source); break;       default: return false;     }      // 按比例缩略/拉伸图片     $new_img = imagecreatetruecolor($pic_w, $pic_h);     imagecopyresampled($new_img, $source_img, 0, 0, 0, 0, $pic_w, $pic_h, $owidth, $oheight);      // 判断是否填充背景     if($this->_bgcolor!=null){       $bg_img = imagecreatetruecolor($this->_width, $this->_height);       $rgb = $this->hex2rgb($this->_bgcolor);       $bgcolor =imagecolorallocate($bg_img, $rgb['r'], $rgb['g'], $rgb['b']);       imagefill($bg_img, 0, 0, $bgcolor);       imagecopy($bg_img, $new_img, (int)(($this->_width-$pic_w)/2), (int)(($this->_height-$pic_h)/2), 0, 0, $pic_w, $pic_h);       $new_img = $bg_img;     }      // 获取目标图片的类型     $dest_ext = $this->get_file_ext($this->_dest);      // 生成图片     switch($dest_ext){       case 1: imagegif($new_img, $this->_dest, $this->_quality); break;       case 2: imagejpeg($new_img, $this->_dest, $this->_quality); break;       case 3: imagepng($new_img, $this->_dest, (int)(($this->_quality-1)/10)); break;     }      if(isset($source_img)){       imagedestroy($source_img);     }      if(isset($new_img)){       imagedestroy($new_img);     }      // 添加水印     $this->add_watermark($this->_dest);      return is_file($this->_dest)? true : false;   }    /** GD库裁剪图片   * @return boolean   */   private function gd_crop(){      // 获取生成的图片尺寸     list($pic_w, $pic_h) = $this->get_size();      // 获取截图的偏移量     list($offset_w, $offset_h) = $this->get_crop_offset($pic_w, $pic_h);      list($owidth, $oheight, $otype) = getimagesize($this->_source);      switch($otype){       case 1: $source_img = imagecreatefromgif($this->_source); break;       case 2: $source_img = imagecreatefromjpeg($this->_source); break;       case 3: $source_img = imagecreatefrompng($this->_source); break;       default: return false;     }      // 按比例缩略/拉伸图片     $tmp_img = imagecreatetruecolor($pic_w, $pic_h);     imagecopyresampled($tmp_img, $source_img, 0, 0, 0, 0, $pic_w, $pic_h, $owidth, $oheight);      // 裁剪图片     $new_img = imagecreatetruecolor($this->_width, $this->_height);     imagecopyresampled($new_img, $tmp_img, 0, 0, $offset_w, $offset_h, $this->_width, $this->_height, $this->_width, $this->_height);      // 获取目标图片的类型     $dest_ext = $this->get_file_ext($this->_dest);      // 生成图片     switch($dest_ext){       case 1: imagegif($new_img, $this->_dest, $this->_quality); break;       case 2: imagejpeg($new_img, $this->_dest, $this->_quality); break;       case 3: imagepng($new_img, $this->_dest, (int)(($this->_quality-1)/10)); break;     }      if(isset($source_img)){       imagedestroy($source_img);     }      if(isset($tmp_img)){       imagedestroy($tmp_img);     }      if(isset($new_img)){       imagedestroy($new_img);     }      // 添加水印     $this->add_watermark($this->_dest);      return is_file($this->_dest)? true : false;   }    /** 获取目标图生成的size   * @return Array $width, $height   */   private function get_size(){     list($owidth, $oheight) = getimagesize($this->_source);     $width = (int)($this->_width);     $height = (int)($this->_height);          switch($this->_type){       case 'fit':         $pic_w = $width;         $pic_h = (int)($pic_w*$oheight/$owidth);         if($pic_h>$height){           $pic_h = $height;           $pic_w = (int)($pic_h*$owidth/$oheight);         }         break;       case 'crop':         if($owidth>$oheight){           $pic_h = $height;           $pic_w = (int)($pic_h*$owidth/$oheight);         }else{           $pic_w = $width;           $pic_h = (int)($pic_w*$oheight/$owidth);         }         break;     }     return array($pic_w, $pic_h);   }    /** 获取截图的偏移量   * @param int $pic_w 图宽度   * @param int $pic_h 图高度   * @return Array $offset_w, $offset_h   */   private function get_crop_offset($pic_w, $pic_h){     $offset_w = 0;     $offset_h = 0;          switch(strtoupper($this->_croppos)){       case 'TL':         $offset_w = 0;         $offset_h = 0;         break;        case 'TM':         $offset_w = (int)(($pic_w-$this->_width)/2);         $offset_h = 0;         break;        case 'TR':         $offset_w = (int)($pic_w-$this->_width);         $offset_h = 0;         break;        case 'ML':         $offset_w = 0;         $offset_h = (int)(($pic_h-$this->_height)/2);         break;        case 'MM':         $offset_w = (int)(($pic_w-$this->_width)/2);         $offset_h = (int)(($pic_h-$this->_height)/2);         break;        case 'MR':         $offset_w = (int)($pic_w-$this->_width);         $offset_h = (int)(($pic_h-$this->_height)/2);         break;        case 'BL':         $offset_w = 0;         $offset_h = (int)($pic_h-$this->_height);         break;        case 'BM':         $offset_w = (int)(($pic_w-$this->_width)/2);         $offset_h = (int)($pic_h-$this->_height);         break;        case 'BR':         $offset_w = (int)($pic_w-$this->_width);         $offset_h = (int)($pic_h-$this->_height);         break;     }     return array($offset_w, $offset_h);   }    /** 添加水印   * @param String $dest 图片路径   */   private function add_watermark($dest){     if($this->_watermark!=null && file_exists($this->_watermark) && file_exists($dest)){       list($owidth, $oheight, $otype) = getimagesize($dest);       list($w, $h, $wtype) = getimagesize($this->_watermark);        // 水印图比原图要小才加水印       if($w<=$owidth && $h<=$oheight){          if($this->_handler=='imagemagick'){ // imagemagick 添加水印$cmd = sprintf("composite -gravity %s -geometry %s -dissolve %s '%s' %s %s", $this->_gravity, $this->_geometry, $this->_opacity, $this->_watermark, $dest, $dest);$this->to_log($cmd);exec($cmd);          }else{ // gd 添加水印switch($wtype){ case 1: $water_img = imagecreatefromgif($this->_watermark); break; case 2: $water_img = imagecreatefromjpeg($this->_watermark); break; case 3: $water_img = imagecreatefrompng($this->_watermark); break; default: return false;           }switch($otype){ case 1: $dest_img = imagecreatefromgif($dest); break; case 2: $dest_img = imagecreatefromjpeg($dest); break; case 3: $dest_img = imagecreatefrompng($dest); break; default: return false;           }// 水印位置           switch(strtolower($this->_gravity)){ case 'northwest':   $posX = 0;   $posY = 0;   break; case 'north':   $posX = ($owidth - $w) / 2;   $posY = 0;   break; case 'northeast':   $posX = $owidth - $w;   $posY = 0;   break; case 'west':   $posX = 0;   $posY = ($oheight - $h) / 2;   break; case 'center':   $posX = ($owidth - $w) / 2;   $posY = ($oheight - $h) / 2;   break; case 'east':   $posX = $owidth - $w;   $posY = ($oheight - $h) / 2;   break; case 'southwest':   $posX = 0;   $posY = $oheight - $h;   break; case 'south':   $posX = ($owidth - $w) / 2;   $posY = $oheight - $h;   break; case 'southeast':   $posX = $owidth - $w;   $posY = $oheight - $h;   break;           }imagealphablending($dest_img, true);           imagecopy($dest_img, $water_img, $posX, $posY, 0, 0, $w, $h);switch($otype){ case 1:imagegif($dest_img, $dest, $this->_quality); break; case 2:imagejpeg($dest_img, $dest, $this->_quality); break; case 3:imagepng($dest_img, $dest, (int)(($this->_quality-1)/10)); break;           }if(isset($water_img)){ imagedestroy($water_img);           }if(isset($dest_img)){ imagedestroy($dest_img);           }         }       }     }   }    /** 判断处理程序是否已安装   * @return boolean   */   private function check_handler(){      $handler = $this->_handler;      if(!in_array($handler, array('imagemagick', 'gd', null))){       return false;     }      // 检查是否有安装imagemagick     $imagemagick_installed = strstr(shell_exec('convert -version'),'Version: ImageMagick')!=''? true : false;      // 检查是否有安装gd库     $gd_installed = function_exists('gd_info')? true : false;      switch($handler){       case 'imagemagick':         return $imagemagick_installed;         break;        case 'gd':         return $gd_installed;         break;        case null:         if($imagemagick_installed){           $this->_handler = 'imagemagick';           return true;         }          if($gd_installed){           $this->_handler = 'gd';           return true;         }         break;     }     return false;   }    /** 创建图片目录   * @param String $path   * @return boolean   */   private function create_dirs($dest){     if(!is_dir(dirname($dest))){       return mkdir(dirname($dest), 0777, true);     }     return true;   }    /** 判断参数是否存在   * @param Array  $obj 数组对象   * @param String $key 要查找的key   * @return boolean   */   private function exists($obj,$key=''){     if($key==''){       return isset($obj) && !empty($obj);     }else{       $keys = explode('.',$key);       for($i=0,$max=count($keys); $i<$max; $i++){         if(isset($obj[$keys[$i]])){           $obj = $obj[$keys[$i]];         }else{           return false;         }       }       return isset($obj) && !empty($obj);     }   }    /** 记录log   * @param String $msg 要记录的log讯息   */   private function to_log($msg){     if($this->_log){       $msg = '['.date('Y-m-d H:i:s').']'.$msg."\r\n";       file_put_contents($this->_log, $msg, FILE_APPEND);     }   }    /** hex颜色转rgb颜色   * @param String $color hex颜色   * @return Array   */   private function hex2rgb($hexcolor){     $color = str_replace('#', '', $hexcolor);     if (strlen($color) > 3) {       $rgb = array(         'r' => hexdec(substr($color, 0, 2)),         'g' => hexdec(substr($color, 2, 2)),         'b' => hexdec(substr($color, 4, 2))       );     } else {       $r = substr($color, 0, 1) . substr($color, 0, 1);       $g = substr($color, 1, 1) . substr($color, 1, 1);       $b = substr($color, 2, 1) . substr($color, 2, 1);       $rgb = array(         'r' => hexdec($r),         'g' => hexdec($g),         'b' => hexdec($b)       );     }     return $rgb;   }    /** 获取图片类型   * @param String $file 图片路径   * @return int   */   private function get_file_ext($file){     $filename = basename($file);     list($name, $ext)= explode('.', $filename);      $ext_type = 0;      switch(strtolower($ext)){       case 'jpg':       case 'jpeg':         $ext_type = 2;         break;       case 'gif':         $ext_type = 1;         break;       case 'png':         $ext_type = 3;         break;     }     return $ext_type;   }  } // class end ?>

demo示例代码如下：

 'fit',   'width' => 100,   'height' => 100, );  $obj = new PicThumb($logfile); $obj->set_config($param); $flag = $obj->create_thumb($source1, $dest1);  if($flag){   echo ''; }else{   echo 'create thumb fail'; }  // 按比例生成缩略图,不足部分用#FF0000填充 $param = array(   'type' => 'fit',   'width' => 100,   'height' => 100,   'bgcolor' => '#FFFF00' );  $obj = new PicThumb($logfile); $obj->set_config($param); $flag = $obj->create_thumb($source1, $dest2);  if($flag){   echo ''; }else{   echo 'create thumb fail'; }  // 裁剪250x250的缩略图,裁剪位置是底部中间,水印位置西南,透明度50 $param = array(   'type' => 'crop',   'croppos' => 'BM',   'width' => 250,   'height' => 250,   'watermark' => $watermark,   'opacity' => 50,   'gravity' => 'SouthWest' );  $obj = new PicThumb($logfile); $obj->set_config($param); $flag = $obj->create_thumb($source1, $dest3);  if($flag){   echo ''; }else{   echo 'create thumb fail'; }  // 按比例生成缩略图 CMYK格式 $param = array(   'type' => 'fit',   'width' => 100,   'height' => 100, );  $obj = new PicThumb($logfile); $obj->set_config($param); $flag = $obj->create_thumb($source2, $dest4);  if($flag){   echo ''; }else{   echo 'create thumb fail'; }  // 按比例生成缩略图,不足部分用#FF0000填充 CMYK格式 $param = array(   'type' => 'fit',   'width' => 100,   'height' => 100,   'bgcolor' => '#FFFF00' );  $obj = new PicThumb($logfile); $obj->set_config($param); $flag = $obj->create_thumb($source2, $dest5);  if($flag){   echo ''; }else{   echo 'create thumb fail'; }  // 裁剪250x250的缩略图,裁剪位置是底部中间,水印位置西南,透明度50 CMYK格式 $param = array(   'type' => 'crop',   'croppos' => 'BM',   'width' => 250,   'height' => 250,   'watermark' => $watermark,   'opacity' => 50,   'gravity' => 'SouthWest' );  $obj = new PicThumb($logfile); $obj->set_config($param); $flag = $obj->create_thumb($source2, $dest6);  if($flag){   echo ''; }else{   echo 'create thumb fail'; } ?>

本文完整实例代码点击此处本站下载。

希望本文所述对大家的PHP程序设计有所帮助

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