为啥无法输出一张图片
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2022-06-12 18:54:49
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为什么无法输出一张图片
输出结果为
------解决方案--------------------
然后得：
仍然是不友好的“验证码”图片
------解决方案--------------------
将header注释掉，打开错误就可以看到错误。
session_start();
//随机码的个数
//$_rnd_code = 4;
//创建随机码
for($i=0;$i $_nmsg.=dechex(mt_rand(0,15));
}
//保存session
$_SESSION['code']=$_nmsg;
//长和高
$_width = 75;
$_height = 25;
//创建一张图像
$_img = imagecreatetruecolor($_width,$_height);
//输出图像
header('Content-Type:image/png');
imagepng($_img);
输出结果为
------解决方案--------------------
按错误信息修改
Notice: Undefined variable: _rnd_code in D:\AMP\web\ide_tmp.php on line 53
Warning: Division by zero in D:\AMP\web\ide_tmp.php on line 53
Notice: Undefined variable: _heght in D:\AMP\web\ide_tmp.php on line 53
Warning: mt_rand(): max(0) is smaller than min(1) in D:\AMP\web\ide_tmp.php on line 53
Notice: Undefined variable: _rnd_code in D:\AMP\web\ide_tmp.php on line 53
Warning: Division by zero in D:\AMP\web\ide_tmp.php on line 53
Notice: Undefined variable: _heght in D:\AMP\web\ide_tmp.php on line 53
Warning: mt_rand(): max(0) is smaller than min(1) in D:\AMP\web\ide_tmp.php on line 53
Notice: Undefined variable: _rnd_code in D:\AMP\web\ide_tmp.php on line 53
Warning: Division by zero in D:\AMP\web\ide_tmp.php on line 53
Notice: Undefined variable: _heght in D:\AMP\web\ide_tmp.php on line 53
Warning: mt_rand(): max(0) is smaller than min(1) in D:\AMP\web\ide_tmp.php on line 53
Notice: Undefined variable: _rnd_code in D:\AMP\web\ide_tmp.php on line 53
Warning: Division by zero in D:\AMP\web\ide_tmp.php on line 53
Notice: Undefined variable: _heght in D:\AMP\web\ide_tmp.php on line 53
Warning: mt_rand(): max(0) is smaller than min(1) in D:\AMP\web\ide_tmp.php on line 53
Notice: Undefined variable: _rnd_code in D:\AMP\web\ide_tmp.php on line 53
Warning: Division by zero in D:\AMP\web\ide_tmp.php on line 53
Notice: Undefined variable: _heght in D:\AMP\web\ide_tmp.php on line 53
Warning: mt_rand(): max(0) is smaller than min(1) in D:\AMP\web\ide_tmp.php on line 53
‰PNG
然后得：
仍然是不友好的“验证码”图片
------解决方案--------------------
将header注释掉，打开错误就可以看到错误。
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