新手求

/**
* TestGuest Version1.0
* ================================================
* Copy 2010-2012 yc60
* Web: http://www.yc60.com
* ================================================
* Author: Lee
* Date: 2010-8-13
*/
session_start();
$_rnd_code = 4;
for ($i=0;$i $_nmsg .= dechex(mt_rand(0,15));
}
$_SESSION['code'] = $_nmsg;
$_width = 75;
$_height = 25;
$_img = imagecreatetruecolor($_width,$_height);
$_white = imagecolorallocate($_img,255,255,255);
imagefill($_img,0,0,$_white);
$_flag = false;
if ($_flag) {
$_black = imagecolorallocate($_img,0,0,0);
imagerectangle($_img,0,0,$_width-1,$_height-1,$_black);
}
for ($i=0;$i $_rnd_color = imagecolorallocate($_img,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255));
imageline($_img,mt_rand(0,$_width),mt_rand(0,$_height),mt_rand(0,$_width),mt_rand(0,$_height),$_rnd_color);
}
for ($i=0;$i $_rnd_color = imagecolorallocate($_img,mt_rand(200,255),mt_rand(200,255),mt_rand(200,255));
imagestring($_img,1,mt_rand(1,$_width),mt_rand(1,$_height),'*',$_rnd_color);
}
for ($i=0;$i $_rnd_color = imagecolorallocate($_img,mt_rand(0,100),mt_rand(0,150),mt_rand(0,200));
imagestring($_img,5,$i*$_width/$_rnd_code+mt_rand(1,10),mt_rand(1,$_height/2),$_SESSION['code'][$i],$_rnd_color);
}
header('Content-Type: image/png');
imagepng($_img);
imagedestroy($_img);
?>





我这显示不了验证码，哪里错了新手求指教

回复讨论(解决方案)

将这行 header('Content-Type: image/png'); 注释掉看报什么错了。

Notice: Undefined variable: _nmsg in ...

$_nmsg = ''; //加上这句
for ($i=0;$i $_nmsg .= dechex(mt_rand(0,15));
}

Fatal error: Call to undefined function imagecreatetruecolor() in D:\wamp\www\TestGuest0.9\code.php on line 29



这个报错

Notice: Undefined variable: _nmsg in ...

$_nmsg = ''; //加上这句
for ($i=0;$i $_nmsg .= dechex(mt_rand(0,15));
}

$_img = imagecreatetruecolor($_width,$_height);



说是这里的错误

打了代码就是不显示 我的是火狐浏览器

那你根本就没有加载 php_gd 扩展

Fatal error: Call to undefined function imagecreatetruecolor() in D:\wamp\www\TestGuest0.9\code.php on line 29



这个报错
这个错是没找到imagecreatetruecolor（）这个方法，你检查一下你的php扩展的php_gd2开启没？

没开 刚在百度查的 我都不知道这个，有学点知识

那你根本就没有加载 php_gd 扩展



Fatal error: Call to undefined function imagecreatetruecolor() in D:\wamp\www\TestGuest0.9\code.php on line 29



这个报错
这个错是没找到imagecreatetruecolor（）这个方法，你检查一下你的php扩展的php_gd2开启没？