PHP script to generate Icon of various sizes with one click

<?php
/**
* @name	thumb 	缩略图函数
* @param	sting	$img_name	图片路径
* @param	int		$max_width	略图最大宽度
* @param	int		$max_height	略图最大高度
* @param	sting	$suffix 略图后缀(如"img_x.jpg"代表小图,"img_m.jpg"代表中图,"img_l.jpg"代表大图)
* @return	void
*/
function thumb($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 = &#39;&#39;;		//图片后缀名

	switch($img_infos[2])
	{
		case 1:
			$img_extension = &#39;gif&#39;;
			break;
		case 2:
			$img_extension = &#39;jpeg&#39;;
			break;
		case 3:
			$img_extension = &#39;png&#39;;
			break;
		default:
			$img_extension = &#39;jpeg&#39;;
			break;
	}

	$new_img_size = array();
	$new_img_size[&#39;width&#39;] = $max_width;
	$new_img_size[&#39;height&#39;] = $max_height;
	
	$img_func = &#39;&#39;;		//函数名称
	$img_handle = &#39;&#39;;	//图片句柄
	$thum_handle = &#39;&#39;;	//略图图片句柄

	switch($img_extension)
	{
		case &#39;jpg&#39;:
			$img_handle = imagecreatefromjpeg($img_name);
			$img_func = &#39;imagejpeg&#39;;
			break;
		case &#39;jpeg&#39;:
			$img_handle = imagecreatefromjpeg($img_name);
			$img_func = &#39;imagejpeg&#39;;
			break;
		case &#39;png&#39;:
			$img_handle = imagecreatefrompng($img_name);
			imagesavealpha($img_handle, true);
			$img_func = &#39;imagepng&#39;;
			break;
		case &#39;gif&#39;:
		 	$img_handle = imagecreatefromgif($img_name);
			$img_func = &#39;imagegif&#39;;
			break;
		default:
			$img_handle = imagecreatefromjpeg($img_name);
			$img_func = &#39;imagejpeg&#39;;
			break;
	}

	$quality = 100;//图片质量
	if($img_func == &#39;imagepng&#39;)
	{
		$quality = 9;
	} 

	$thum_handle = imagecreatetruecolor($new_img_size[&#39;height&#39;],$new_img_size[&#39;width&#39;]);
	imagealphablending($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(&#39;imagecopyresampled&#39;))
	{
		imagecopyresampled($thum_handle,$img_handle, 0, 0, 0, 0,$new_img_size[&#39;height&#39;],$new_img_size[&#39;width&#39;],$img_height,$img_width);
	} 
	else 
	{
		imagecopyresized($thum_handle,$img_handle, 0, 0, 0, 0,$new_img_size[&#39;height&#39;],$new_img_size[&#39;width&#39;],$img_height,$img_width);
	}

    call_user_func_array($img_func,array($thum_handle,$path.&#39;/&#39;.$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']);
}

?>