PHP image resizing with fixed height and width

This function will resize images via php gd library.

<?
function Image($image, $maxWidth, $maxHeight, $padding = 0, $r = 255, $g = 255, $b = 255 )
{
    $image = ImageCreateFromString(file_get_contents($image));
    if (is_resource($image) === true)
    {
        $x = 0;
        $y = 0;
       
        $width = imagesx($image);
        $height = imagesy($image);
       
        $result = ImageCreateTrueColor($maxWidth, $maxHeight);
       
        $ratio = min( $maxWidth / $width, $maxHeight/ $height );
       
        $newWidth = $ratio * $width;
        $newHeight = $ratio * $height;
       
        $newWidth = $newWidth - $padding;
        $newHeight = $newHeight - $padding;
       
        $new_x = ($maxWidth - $newWidth) /2;
        $new_y = ($maxHeight - $newHeight) /2;
       
        ImageSaveAlpha($result, true);
        ImageAlphaBlending($result, true);
        ImageFill($result, 0, 0, ImageColorAllocate($result, $r, $g, $b));
        ImageCopyResampled($result, $image, $new_x, $new_y, $x, $y, $newWidth, $newHeight, $width, $height);
       
        ImageInterlace($result, true);
        ImageJPEG($result, null, 90);
    }
    
    return false;
}
header('Content-Type: image/jpeg');
Image('zzz.jpg', 500, 300, 5, 0, 0,0 );
?>