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Informations about the package php-captcha

php-captcha

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:

正在使用

SmartWiki文档管理系统


All versions of php-captcha 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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