function getLogo($logo, $width, $height, $name) { 
   $fileArr = pathinfo($logo); 
   $dirname = $fileArr['dirname']; 
   $filename = $fileArr['filename']; 
   $extension = $fileArr['extension']; 
   $logo_rs = ""; 
   if ($width > 0  $height > 0) { 
     $name_thumb = $dirname . "/" . $filename . "_" . $width . "_" . $height . "." . $extension; 
     if (!file_exists($name_thumb)) { 
       if (file_exists($logo)) { 
         $image = new \Think\Image(); 
         $image->open($logo); 
         $image->thumb($width, $height)->save($name_thumb); 
       } else { 
         $name_thumb = ""; 
       } 
     } 
     if ($name_thumb) { 
       $logo_rs = $name_thumb; 
     } 
   } else { 
     $logo_rs = $logo; 
   } 
   if ($logo_rs) { 
     if ($name) { 
       return "img src='" . __APP__ . "/" . $logo_rs . "' alt='" . $name . "'/>"; 
     } else { 
       return __APP__ . "/" . $logo_rs; 
     } 
   } 
 }

img alt="350*350" src="{$logo|getLogo=###,350,350}" />