How can I write diagonal text in PHP - php

Question

I want to import some timestamps from a table and I want to write them diagonal under the graph. How can I do that?
here is my code, but not for the import data.
header("Content-type: image/png");
$img = imagecreate(100, 75);
$bg = imagecolorallocate($img, 255, 255, 0);
$black = imagecolorallocate($img, 0, 0, 0);
$roles = array('anoniem', 'ingelogd', 'leerling', 'docent', 'rector');
$left = 0;
foreach ($roles as $role) {
imagestring ($img, 2, 0, $left, $role, $black);
$left+= 15;
}
$img2 = imagerotate($img, 45, $bg);
imagedestroy($img);
imagepng($img2);

Answer 1

imagettftext() is used to write text to an image resource at any angle. This isn't quite a drop-in replacement for imagestring() but it's not difficult to get working. Modifying your code gives me this:
$img = imagecreate(100, 75);
$bg = imagecolorallocate($img, 255, 255, 0);
$black = imagecolorallocate($img, 0, 0, 0);
$roles = array('anoniem', 'ingelogd', 'leerling', 'docent', 'rector');
$left = 10;
foreach ($roles as $role) {
imagettftext($img, 10, 45, $left, 50, $black, 'arial.ttf', $role);
$left+= 15;
}
header("Content-type: image/png");
imagepng($img);
And this seems to be what you want.
Before:
After: