一个简单php验证码程序代码-php手册-php.cn

一个简单php验证码程序代码

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Release： 2016-06-13 10:12:41

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网上生成php验证码程序用很多，下面我来给大家分享一款超不错的php验证码程序代码,有需要的朋友可参考。

验证码识别一般分为以下几个步骤：

1. 取出字模
2. 二值化
3. 计算特征
4. 对照样本

代码如下

复制代码

function _code($_code_length = 4, $_width = 75, $_height = 25){
    for($i=0;$i         $_nmsg .= dechex(mt_rand(0,15));
    }
    $_SESSION["code"] = $_nmsg;

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

$_white = imagecolorallocate($_img, 250, 250, 250);

imagefill($_img, 0, 0, $_white);

$_gray = imagecolorallocate($_img, 196, 196, 196);

imagerectangle($_img, 0, 0, $_width-1, $_height-1, $_gray);

    for ($i=0; $i         $_md_color = imagecolorallocate($_img, mt_rand(200,255), mt_rand(200,255), mt_rand(200,255));
        imageline($_img, mt_rand(0,$_width), mt_rand(0, $_height),mt_rand(0,$_width), mt_rand(0, $_height), $_md_color);
    }

    for ($i=0; $i         $_md_color = imagecolorallocate($_img, mt_rand(200,255), mt_rand(200,255), mt_rand(200,255));
        imagestring($_img, 1, mt_rand(1,$_width-5), mt_rand(1, $_height-5), "*", $_md_color);
    }

    for ($i=0; $i         $_md_color = imagecolorallocate($_img, mt_rand(0,102), mt_rand(0,102), mt_rand(0,102));
        imagestring($_img, 5, $i * $_width/$_code_length+ mt_rand(1, 10), mt_rand(1, $_height/2), $_SESSION["code"][$i], $_md_color);
    }

header("Content-Type:image/png");

imagepng($_img);

imagedestroy($_img);
}

验证码使用方法

代码如下

复制代码

$getcode = $_POST['code'];

if( $_SESSION["code"] = $getcode )
{
echo ' 验证合法，进入下一步';
unset( $_SESSION["code"] );
}
else
{
echo ' 验证码不正确';
header('location:vial.php');
}