Using image create function - php

Question

I'm using Creating image function to create an image with exact text message using the following code
<?PHP
header ("Content-type: image/gif");
$image=imagecreatefromgif("myimage.gif"); // will be background img
$black = imagecolorallocate($image, 0,0,0);
$message = "Hello Egypt";
imagestring($image, 4, 25, 10, $message, $black);
imagegif($image);
imagedestroy($image);
?>
The output should be like this
Now my question is there any way i can write image over it not only text
so that if i've flag image at same path (flag.gif ) and i would like to write it just after my $message to be like this
so is this possible and how could be ! ~ thanks a lot
Update
based on #MarcB idea of using imagecopy function
<?PHP
header ("Content-type: image/gif");
$image=imagecreatefromgif("myimage.gif"); // will be background img
$src = imagecreatefromjpeg('flag.jpg');// new image will add
imagecopy($image, $src, 120, 10, 0, 0, 32, 20);
$black = imagecolorallocate($image, 0,0,0);
$message = "Hello Egypt";
imagestring($image, 4, 25, 10, $message, $black);
imagegif($image);
imagedestroy($image);
?>
the output is not true color WHY :(
ANY help about this new problem ~ thanks

Answer 1

With the help of Surreal Dreams and Marc B
This one works fine
<?PHP
header ("Content-type: image/gif");
$image=imagecreatefromjpeg("myimage.jpg"); // will be background img
$src = imagecreatefromjpeg('flag.jpg');// new image will add
imagecopy($image, $src, 120, 10, 0, 0, 32, 20);
$black = imagecolorallocate($image, 0,0,0);
$message = "Hello Egypt";
imagestring($image, 4, 25, 10, $message, $black);
imagegif($image);
imagedestroy($image);
?>
Output
I've should have learned the following functions
imagecopy
imagecreatefromjpeg
imagecreatefromgif

Answer 2

imagecopy() should properly deal with differences between images' palettes; however, the GIF format does not support more than 256 colors, and neither does GD when it works with palette-based images. If 256 palette entries already exist when GD tries to use a new color, GD will pick the closest match, which can produce the results you see.
To avoid this problem, you should use imagecreatetruecolor() to create a 24-bit true-color image in memory. You can then use imagecopy() to insert each GIF image (including the background) and imagepng() to generate PNG output, which is better for line art than JPEG, offers better compression than GIF, and can support more than 256 colors.