Que faire si php gd est tronqué ?

$pic=imagecreate(250,30); 
$black=imagecolorallocate($pic,0,0,0); 
$white=imagecolorallocate($pic,255,255,255); 
$font="C://WINDOWS//Fonts//simhei.ttf";  //这里的路进需要注意下，必须是字符的路径
$str ='php'.iconv('gb2312','utf-8','面对对象')." www.phpobject.net"; 
imagettftext($pic,10,0,10,20,$white,$font,$str);

<?php 
$pic=imagecreate(250,30); 
$black=imagecolorallocate($pic,0,0,0); 
$white=imagecolorallocate($pic,255,255,255); 
$font="C://WINDOWS//Fonts//simhei.ttf";  
$str =&#39;php&#39;.iconv(&#39;gb2312&#39;,&#39;utf-8&#39;,&#39;面对对象&#39;)." www.phpobject.net"; 
imagettftext($pic,10,0,10,20,$white,$font,$str);
header("Content-type: image/jpeg");
$filename=&#39;../src/images/photo.jpg&#39;;
$im=imagecreatefromjpeg($filename);
imagecopymerge($im,$pic,0,0,0,0,250,30,50);
imagejpeg($im);
?>