经典的PHP缩略图生成程式,基于GD库,可指定生成路径及生成目标的宽高细节 使用方法: 在支持GD库的PHP环境中,将以下代码另存为resize.php测试 


经典的PHP缩略图生成程式,基于GD库,可指定生成路径及生成目标的宽高细节 

使用方法: 在支持GD库的PHP环境中,将以下代码另存为resize.php测试  

<?  

$FILENAME="image_name";  

// 生成图片的宽度  
$RESIZEWIDTH=400;  

// 生成图片的高度  
$RESIZEHEIGHT=400;  

//生成图片的路径  
$uploaddir="c:/winnt/temp";  

function ResizeImage($im,$maxwidth,$maxheight,$name){  
global $uploaddir;  
$width = imagesx($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,$uploaddir.$name . ".jpg");  
ImageDestroy ($newim);  
}else{  
ImageJpeg ($im,$uploaddir.$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);  
}  
}  
?>  

<img src="<? echo($FILENAME.".jpg?reload=".rand(0,999999)); ?>"><br><br>  

<form enctype="multipart/form-data" method="post">  
<br>  
<input type="file" name="image" size="50" value="浏览"><p>  
<input type="submit" value="上传图片">  
</form>   

</body>  
</html>