PHP图片缩放

    /**      * 图片缩放      */     function resizeImage($p_w_picpath, $prefix = '', $width = 266, $compression = 0)     {         //判断操作系统转换图片名称编码         if(strtoupper(substr(PHP_OS, 0, 3)) === 'WIN')         {             $p_w_picpath = iconv('utf-8', 'gbk', $p_w_picpath);         }         //获取图片相关信息         $imgInfo = getp_w_picpathsize($p_w_picpath);         $imgInfo['width'] = $imgInfo[0];         $imgInfo['height'] = $imgInfo[1];         $width = $imgInfo['width'] < $width ? $imgInfo['width'] : $width;                  if(!empty($imgInfo['width']) && !empty($imgInfo['height']))         {                          switch ($imgInfo['mime'])             {                 case 'p_w_picpath/jpeg':                     $imgRes = p_w_picpathcreatefromjpeg($p_w_picpath);                     break;                 case 'p_w_picpath/gif':                     $imgRes = p_w_picpathcreatefromgif($p_w_picpath);                     break;                 case 'p_w_picpath/png':                     $imgRes = p_w_picpathcreatefrompng($p_w_picpath);                     break;                 case 'p_w_picpath/bmp':                     $imgRes = p_w_picpathcreatefromwbmp($p_w_picpath);                     break;             }                          if($imgRes)             {                 $proportion = $width / $imgInfo['width'];                 $height = $imgInfo['height'] * $proportion;                 $white = p_w_picpathcreatetruecolor($width, $height);                 //缩小图片                 p_w_picpathcopyresampled($white, $imgRes, 0, 0, 0, 0, $width, $height, $imgInfo['width'], $imgInfo['height']);                 $imgName = $prefix ? $prefix . $this->nameToChina($p_w_picpath) : $this->nameToChina($p_w_picpath);                 $p_w_picpathName = dirname($p_w_picpath) . DS . $imgName;                 if(file_exists($p_w_picpathName))                 {                     unlink($p_w_picpathName);                 }                                  if(!$compression)                 {                     p_w_picpathpng($white, $p_w_picpathName);                 }                 else                 {                     p_w_picpathjpeg($white,$p_w_picpathName);                 }                                  //销毁资源                 p_w_picpathdestroy($white);                 p_w_picpathdestroy($imgRes);             }         }     }