note 71651 added to function.imagettfbbox

This code is not working i don't know why its give this prb Fatal error: Call to undefined function: imagettfbbox() in /home/mywebsite/public_html/tell/Contact/sec_image.php on line 31 the Code is that ! <?php /********************************************************* *********************************************************/ //Include configuration file and function file //(default location is in the same directory) include_once('config.php'); include_once('functions.php'); $te_co = hex2bin($_GET['code']); $textstr = RC4($te_co,$IMAGE_VER_CODE); //Show Image $im = imagecreatefrompng($IMAGE_VER_BACK); //Create random size, angle, and dark color $angle = rand(-5, 5); $color = imagecolorallocate($im, rand(0, 100), rand(0, 100), rand(0, 100)); //Determine text size, and use dimensions to generate x & y coordinates $textsize = imagettfbbox($IMAGE_VER_SIZE, $angle, $IMAGE_VER_FONT, $textstr); $twidth = abs($textsize[2]-$textsize[0]); $theight = abs($textsize[5]-$textsize[3]); $x = (imagesx($im)/2)-($twidth/2)+(rand(-20, 20)); $y = (imagesy($im))-($theight/2); //Add text to image imagettftext($im, $IMAGE_VER_SIZE, $angle, $x, $y, $color, $IMAGE_VER_FONT, $textstr); //Output PNG Image header("Content-Type: image/png"); imagepng($im); //Destroy the image to free memory imagedestroy($im); //End Output exit; ?> ---- Server IP: 193.27.201.10 (proxied: 193.27.201.10 1.0 www1.shellkonto.se:3128 (squid/2.5.STABLE4)) Probable Submitter: 212.138.64.179 (proxied: 87.109.144.215) ---- Manual Page -- http://www.php.net/manual/en/function.imagettfbbox.php Edit -- https://master.php.net/note/edit/71651 Del: integrated -- https://master.php.net/note/delete/71651/integrated Del: useless -- https://master.php.net/note/delete/71651/useless Del: bad code -- https://master.php.net/note/delete/71651/bad+code Del: spam -- https://master.php.net/note/delete/71651/spam Del: non-english -- https://master.php.net/note/delete/71651/non-english Del: in docs -- https://master.php.net/note/delete/71651/in+docs Del: other reasons-- https://master.php.net/note/delete/71651 Reject -- https://master.php.net/note/reject/71651 Search -- https://master.php.net/manage/user-notes.php