<?php
?
????header("Content-type:text/html;charset=utf-8");?
//創建畫布
//通過GD庫創建驗證碼
????$width?=?80;
????$height?=?28;
????$image?=?imagecreatetruecolor?(?$width,?$height?);
????$white?=?imagecolorallocate?(?$image,?255,?255,?255?);
????$black?=?imagecolorallocate?(?$image,?0,?0,?0?);
//填充矩形
????imagefilledrectangle?(?$image,?1,?1,?$width?-?2,?$height?-?2,?$white?);
????$length=4;
????$type=1;
????$chars?=?buildRandomString?(?$type,?$length?);
$sess_name="verify";
$_SESSION[$sess_name]=$chars;
$fontfile="msyhbd.ttc";
for($i=0;$i<$length;$i++){
????????$size?=?mt_rand?(?14,?18?);
????????$angle?=?mt_rand?(?-?15,?15?);
????????$x?=?5?+?$i?*?$size;
????????$y?=?mt_rand?(?20,?26?);
????????$color?=?imagecolorallocate?(?$image,?mt_rand?(?50,?90?),?mt_rand?(?80,?200?),?mt_rand?(?90,?180?)?);?
????????$text?=?substr?(?$chars,?$i,?1?);
????????imagettftext?(?$image,?$size,?$angle,?$x,?$y,?$color,?$fontfile,?$text?);
}
header("Cache-Control:?max-age=1,?s-maxage=1,?no-cache,?must-revalidate");
ob_clean();?
header("Content-type:?image/png;charset=utf8");
imagegif($image);
imagedestroy($image);


function?buildRandomString($type=1,$length=4){
????if($type==1){
????????$chars=join("",range(0,9));
????}elseif($type==2){
????????$chars=join("",array_merge(range("a","z"),range("A","Z")));
??????????
????}elseif($type==3){
????????$chars=join("",array_merge(range("a","z"),range("A","Z"),range(0,9)));
????}
????if($length>strlen($chars)){
????????exit("字符串長度不夠");
????}
????$chars=str_shuffle($chars);
????return?substr($chars,0,$length);
}
?>

我把他寫在一個文件中可以的，你難道沒有報錯嗎，只顯示一個數字的話