The image output of GD library and Echo related problems

GD library image output and echo problem

Header ("Content-type:image/png"); Notifies the browser that an image formatted as PNG will be output
$im = Imagecreatetruecolor (400, 30); Create a 400x300 pixel-sized canvas

$white = Imagecolorallocate ($im, 255, 255, 255); Create White
$grey = Imagecolorallocate ($im, 128, 128, 128); Create Gray
$black = imagecolorallocate ($im, 0, 0, 0); Create Black
Imagefilledrectangle ($im, 0, 0, 399, $black); Output a rectangle with white fill as the background

If there is a Chinese output, it needs to be transcoded and converted to a UTF-8 string to be passed directly
$text =iconv ("GB2312", "UTF-8", "lamp brother Lian--no brother, no programming!") ");
$font = ' SIMSUN.TTC '; Specifies the font to copy the font corresponding to the SIMSUM.TTC in the system to the current directory
Imagettftext ($im, 0, $grey, $font, $text); Output a gray string as a shadow
Imagettftext ($im, 0, $black, $font, $text); Output a black string on top of the shadow


Imagepng ($im); Export images in PNG format to the browser
Imagedestroy ($im); Destroying resources, freeing up memory footprint
echo "AAAAAAAAAAAAAAA";

?>

The Echo statement from the last line of the above code is out of the print, why?


------Solution--------------------
The output! I don't believe you. Using binary editing software to open the resulting picture, ensure that there is aaaaaaaaaaaaaaa at the end of the file

Since the header ("Content-type:image/png"); Notifies the browser that an image formatted as PNG will be output
Then that AAAAAAAAAAAAAAA is part of the picture.
------Solution--------------------
Two different data streams cannot be output at the same time
------Solution--------------------
Wood has a way. You want to output a picture, and you want to display a paragraph of text. The HTML page is not the only line. The link to the image is changed to create a link to the image
------Solution--------------------
There should be no mistake

