Código:
<?php if(!isset($_GET['txt'])) { exit(); } header ("Content-type: image/png"); $string = $_GET['txt']; $font = 4; $width = ImageFontWidth($font) * strlen($string); $height = ImageFontHeight($font); $im = @imagecreate ($width,$height); $background_color = imagecolorallocate ($im, 255, 255, 255); //white background $text_color = imagecolorallocate ($im, 0, 0,0);//black text imagestring ($im, $font, 0, 0, $string, $text_color); imagepng ($im); ?>