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错误提示一般为： Problem 1 -
topthink/think-captcha v3.0.3 requires topthink/framework ^6.0.0 -> satisf iable by topthink/framework[6.0.x-dev,
v6.0.0, v6.0.0-rc2, v6.0.0-rc3, v6.0.0-rc 4, v6.0.0-rc5, v6.0.1, v6.0.2, v6.0.3] but
these conflict with your requirements or
minimum-stability. -
topthink/think-captcha v3.0.2 requires topthink/framework ^6.0.0 -> satisf iable by topthink/framework[6.0.x-dev,
v6.0.0, v6.0.0-rc2, v6.0.0-rc3, v6.0.0-rc 4, v6.0.0-rc5, v6.0.1, v6.0.2, v6.0.3] but
these conflict with your requirements or
minimum-stability. -
topthink/think-captcha v3.0.1 requires topthink/framework ^6.0.0 -> satisf iable by topthink/framework[6.0.x-dev,
v6.0.0, v6.0.0-rc2, v6.0.0-rc3, v6.0.0-rc 4, v6.0.0-rc5, v6.0.1, v6.0.2, v6.0.3] but
these conflict with your requirements or
minimum-stability. -
topthink/think-captcha v3.0.0 requires topthink/framework ^6.0.0 -> satisf iable by topthink/framework[6.0.x-dev,
v6.0.0, v6.0.0-rc2, v6.0.0-rc3, v6.0.0-rc 4, v6.0.0-rc5, v6.0.1, v6.0.2, v6.0.3] but
these conflict with your requirements or
minimum-stability. -
Installation request for topthink/think-captcha ^3.0 -> satisfiable by top think/think-captcha[v3.0.0, v3.0.1, v3.0.2,
v3.0.3].
Installation failed, reverting
./composer.json to its original content.
解决方法： Composer
安装 topthink/think-captcha 时报错 requires topthink/framework ^6.0.0 当我们使用命令 composer require topthink/think-captcha下载验证码库时，默认下载最新版本，当前最新版本是3.0， 3.0版本是为 ThinkPHP 6 准备的，所以我们需要下载 2.0 版本验证码库，2.0 版本的才是为 ThinkPHP5.1 准备的， 所以我们只要使用 composer 命令下载验证码库的时候指定版本号即可 composer
require topthink/think-captcha=2.* 如果你使用的是 TP 5.0.* 的版本，直接运行上面的安装命令还是会报错，最直接的方法就是去
packagist 网站查看该代码包对应的 tp 版本，然后安装对应的版本即可
我当前的 TP 版本为 5.0.24，则可以安装
think-captcha=1.*即安装命令为： composer require topthink/think-captcha=1.*
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发表于 2020-11-22 15:14:44