<"img_x.jpg"代表小图,"img_m.jpg"代表中图,"img_l.jpg"代表大图) 
* @return  void 
*/ 
function thumb($img_name,$max_width,$max_height,$path,$new_name) 
{ 
  $img_infos = getimagesize($img_name); 
  $img_height = $img_infos[0];//图片高 
  $img_width = $img_infos[1]; //图片宽 
  $img_extension = '';    //图片后缀名 
 
  switch($img_infos[2]) 
  { 
    case 1: 
      $img_extension = 'gif'; 
      break; 
    case 2: 
      $img_extension = 'jpeg'; 
      break; 
    case 3: 
      $img_extension = 'png'; 
      break; 
    default: 
      $img_extension = 'jpeg'; 
      break; 
  } 
 
  $new_img_size = array(); 
  $new_img_size['width'] = $max_width; 
  $new_img_size['height'] = $max_height; 
   
  $img_func = '';   //函数名称 
  $img_handle = '';  //图片句柄 
  $thum_handle = ''; //略图图片句柄 
 
  switch($img_extension) 
  { 
    case 'jpg': 
      $img_handle = imagecreatefromjpeg($img_name); 
      $img_func = 'imagejpeg'; 
      break; 
    case 'jpeg': 
      $img_handle = imagecreatefromjpeg($img_name); 
      $img_func = 'imagejpeg'; 
      break; 
    case 'png': 
      $img_handle = imagecreatefrompng($img_name); 
      imagesavealpha($img_handle, true); 
      $img_func = 'imagepng'; 
      break; 
    case 'gif': 
      $img_handle = imagecreatefromgif($img_name); 
      $img_func = 'imagegif'; 
      break; 
    default: 
      $img_handle = imagecreatefromjpeg($img_name); 
      $img_func = 'imagejpeg'; 
      break; 
  } 
 
  $quality = 100;//图片质量 
  if($img_func == 'imagepng') 
  { 
    $quality = 9; 
  }  
 
  $thum_handle = imagecreatetruecolor($new_img_size['height'],$new_img_size['width']); 
  imagealphablending($thum_handle,false);//这里很重要,意思是不合并颜色,直接用$img图像颜色替换,包括透明色; 
  imagesavealpha($thum_handle,true);//这里很重要,意思是不要丢了$thumb图像的透明色; 
 
  if(function_exists('imagecopyresampled')) 
  { 
    imagecopyresampled($thum_handle,$img_handle, 0, 0, 0, 0,$new_img_size['height'],$new_img_size['width'],$img_height,$img_width); 
  }  
  else  
  { 
    imagecopyresized($thum_handle,$img_handle, 0, 0, 0, 0,$new_img_size['height'],$new_img_size['width'],$img_height,$img_width); 
  } 
 
  call_user_func_array($img_func,array($thum_handle,$path.'/'.$new_name,$quality)); 
  imagedestroy($thum_handle);//清除句柄 
  imagedestroy($img_handle);//清除句柄 
} 
 
 
$IconArray = array  
( 
  "IOS8" => array  
  ( 
    array("width" => 180,  "height"=> 180, "path"=>"ios8",   "name"=>"Icon-180.png"), 
    array("width" => 120,  "height"=> 120, "path"=>"ios8",   "name"=>"Icon-120.png"), 
    array("width" => 152,  "height"=> 152, "path"=>"ios8",   "name"=>"Icon-152.png"), 
    array("width" => 76,   "height"=> 76,    "path"=>"ios8",   "name"=>"Icon-76.png"),  
    array("width" => 144,  "height"=> 144, "path"=>"ios8",   "name"=>"Icon-144.png"), 
    array("width" => 72,   "height"=> 72,    "path"=>"ios8",   "name"=>"Icon-72.png"), 
    array("width" => 114,  "height"=> 114, "path"=>"ios8",   "name"=>"Icon-114.png"), 
    array("width" => 57,   "height"=> 57,    "path"=>"ios8",   "name"=>"Icon-57.png"),  
    array("width" => 100,  "height"=> 100, "path"=>"ios8",   "name"=>"Icon-100.png"), 
    array("width" => 50,   "height"=> 50,    "path"=>"ios8",   "name"=>"Icon-50.png"),  
    array("width" => 80,   "height"=> 80,    "path"=>"ios8",   "name"=>"Icon-80.png"), 
    array("width" => 40,   "height"=> 40,    "path"=>"ios8",   "name"=>"Icon-40.png"), 
    array("width" => 58,   "height"=> 58,    "path"=>"ios8",   "name"=>"Icon-58.png"), 
    array("width" => 29,   "height"=> 29,    "path"=>"ios8",   "name"=>"Icon-29.png"), 
  ), 
  "IOS" => array  
  ( 
    array("width" => 180,  "height"=> 180, "path"=>"ios",    "name"=>"Icon-60@3x.png"), 
    array("width" => 120,  "height"=> 120, "path"=>"ios",    "name"=>"Icon-60@2x.png"), 
    array("width" => 152,  "height"=> 152, "path"=>"ios",    "name"=>"Icon-76@2x.png"), 
    array("width" => 76,   "height"=> 76,    "path"=>"ios",    "name"=>"Icon-76.png"),  
    array("width" => 144,  "height"=> 144, "path"=>"ios",    "name"=>"Icon-72@2x.png"), 
    array("width" => 72,   "height"=> 72,    "path"=>"ios",    "name"=>"Icon-72.png"), 
    array("width" => 114,  "height"=> 114, "path"=>"ios",    "name"=>"Icon-57@2x.png"), 
    array("width" => 57,   "height"=> 57,    "path"=>"ios",    "name"=>"Icon-57.png"),  
    array("width" => 100,  "height"=> 100, "path"=>"ios",    "name"=>"Icon-50@2x.png"), 
    array("width" => 50,   "height"=> 50,    "path"=>"ios",    "name"=>"Icon-50.png"),  
    array("width" => 80,   "height"=> 80,    "path"=>"ios",    "name"=>"Icon-40@2x.png"), 
    array("width" => 40,   "height"=> 40,    "path"=>"ios",    "name"=>"Icon-40.png"), 
    array("width" => 58,   "height"=> 58,    "path"=>"ios",    "name"=>"Icon-29@2x.png"), 
    array("width" => 29,   "height"=> 29,    "path"=>"ios",    "name"=>"Icon-29.png"), 
  ) 
  , 
  "ANDROID" => array 
  ( 
    array("width" => 144,  "height" => 144,   "path" => "android/drawable",      "name"=>"icon.png"), 
    array("width" => 144,  "height" => 144,   "path" => "android/drawable-xhdpi", "name"=>"icon.png"), 
    array("width" => 72,   "height" => 72, "path" => "android/drawable-hdpi",    "name"=>"icon.png"), 
    array("width" => 48,   "height" => 48, "path" => "android/drawable-mdpi",    "name"=>"icon.png"), 
    array("width" => 32,   "height" => 32, "path" => "android/drawable-ldpi",    "name"=>"icon.png") 
  ) 
); 
 
 
foreach ($IconArray["IOS8"] as $key => $IconType)  
{ 
  thumb("icon.png",$IconType['width'],$IconType['height'],$IconType['path'],$IconType['name']); 
} 
 
foreach ($IconArray["IOS"] as $key => $IconType)  
{ 
  thumb("icon.png",$IconType['width'],$IconType['height'],$IconType['path'],$IconType['name']); 
} 
 
foreach ($IconArray["ANDROID"] as $key => $IconType)  
{ 
  thumb("icon.png",$IconType['width'],$IconType['height'],$IconType['path'],$IconType['name']); 
} 
 
?>