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Example code of lyhiving/mcaptcha

Informations about the package mcaptcha

mcaptcha

简单的php验证码库。

PHP生成验证码图片

PHP生成验证码的原理：使用PHP的GD库，生成一张带验证码的图片，并将验证码保存在Session中。PHP生成验证码的大致流程有：

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、产生指定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破解验证码；

7、输出图片；

8、释放图片所占内存。

图片实例

1 2 3 4 5 6

安装

使用 Composer

用法

直接输出图片：

保存图片到硬盘：

获取验证码文字：

All versions of mcaptcha with dependencies

PHP Build Version
Package Version
Requires php Version >=5.4
ext-gd Version *
Composer command for our command line client (download client) This client runs in each environment. You don't need a specific PHP version etc. The first 20 API calls are free. Standard composer command

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