wd and cc

一个自动生成缩略图的程序

$FILENAME="image_name";


// 生成图片的宽度

$RESIZEWIDTH=400;


// 生成图片的高度

$RESIZEHEIGHT=400;



function ResizeImage($im,$maxwidth,$maxheight,$name){

	$width = imagesx($im);

	$height = imagesy($im);

	

	if(($maxwidth && $width > $maxwidth) || ($maxheight && $height > $maxheight)){

		if($maxwidth && $width > $maxwidth){

			$widthratio = $maxwidth/$width;

			$RESIZEWIDTH=true;

		}


		if($maxheight && $height > $maxheight){

			$heightratio = $maxheight/$height;

			$RESIZEHEIGHT=true;

		}


		if($RESIZEWIDTH && $RESIZEHEIGHT){

			if($widthratio < $heightratio){

				$ratio = $widthratio;

			}else{

				$ratio = $heightratio;

			}

		}elseif($RESIZEWIDTH){

			$ratio = $widthratio;

		}elseif($RESIZEHEIGHT){

			$ratio = $heightratio;

		}

		

		$newwidth = $width * $ratio;

		$newheight = $height * $ratio;

		

		if(function_exists("imagecopyresampled")){

			$newim = imagecreatetruecolor($newwidth, $newheight);

			imagecopyresampled($newim, $im, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);

		}else{

			$newim = imagecreate($newwidth, $newheight);

			imagecopyresized($newim, $im, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);

		}

		

		ImageJpeg ($newim,$name . ".jpg");

		ImageDestroy ($newim);

	}else{

		ImageJpeg ($im,$name . ".jpg");

	}

}




if($_FILES['image']['size']){

	if($_FILES['image']['type'] == "image/pjpeg"){

		$im = imagecreatefromjpeg($_FILES['image']['tmp_name']);

	}elseif($_FILES['image']['type'] == "image/x-png"){

		$im = imagecreatefrompng($_FILES['image']['tmp_name']);

	}elseif($_FILES['image']['type'] == "image/gif"){

		$im = imagecreatefromgif($_FILES['image']['tmp_name']);

	}

	

	if($im){

		if(file_exists("$FILENAME.jpg")){

			unlink("$FILENAME.jpg");

		}

		ResizeImage($im,$RESIZEWIDTH,$RESIZEHEIGHT,$FILENAME);

		ImageDestroy ($im);

	}

}


?>

自动