Уменьшение размера

$maxsize = 100; 
$image="img.jpg"; 
$size = GetImageSize($image);  
$width = $size[0];  
$height = $size[1];  
$x_ratio = $maxsize / $width;  
$y_ratio = $maxsize / $height;  
if ( ($width <= $maxsize) && ($height <= $maxsize) ) {  
  $tn_width = $width;        
  $tn_height = $height;  
}  
else if (($x_ratio * $height) < $maxsize) {  
  $tn_height = ceil($x_ratio * $height);  
  $tn_width = $maxsize;  
}  
else {  
  $tn_width = ceil($y_ratio * $width);  
  $tn_height = $maxsize;  
}  
$src = ImageCreateFromJpeg($image);  
$dst = ImageCreateTrueColor($tn_width,$tn_height);  
ImageCopyResized($dst, $src, 0, 0, 0, 0,  
    $tn_width,$tn_height,$width,$height);  
header("Content-type: image/jpeg");  
ImageJpeg ($dst, null, 40); 
ImageDestroy($src);  
ImageDestroy($dst); 

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