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php验证码的制作思路和实现方法

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Release： 2016-06-06 19:36:49
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这篇文章主要介绍了php验证码的制作思路和实现方法，我们不能盲目的去实现php生成验证码，更应该了解php验证码的基本原理，真正的掌握php验证码的实现方法，需要

由于注册的时候常常会用到注册码来防止机器恶意注册，这里我发表一个产生png图片验证码的基本图像，简单的思路分析：

1、产生一张png的图片
2、为图片设置背景色
3、设置字体颜色和样式
4、产生4位数的随机的验证码
5、把产生的每个字符调整旋转角度和位置画到png图片上
6、加入噪点和干扰线防止注册机器分析原图片来恶意注册
7、输出图片
8、释放图片所占内存

二、实现方法

authcode.php文件

效果图：

php验证码的制作思路和实现方法

以上就是php验证码的制作思路和实现方法，希望对大家的学习有所帮助。

Related labels：
php验证码的实现 php数字验证码 php实现手机验证码
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