Something

<?php
// create a 100*30 image
$im = imagecreate(500, 30);

// white background and blue text
$bg = imagecolorallocate($im, 255, 255, 255);
$textcolor = imagecolorallocate($im, 0, 0, 255);
$textcolor2 = imagecolorallocate($im, 0, 0, 0);

// write the string at the top left
imagestring($im, 5, 0, 0, "Hello world!", $textcolor);
imagestring($im, 5, 120, 0, "i am hero :)", $textcolor2);

// output the image
header("Content-type: image/png");
imagepng($im);
?>