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To complete the background Management system login function, by looking at the login page, we can learn that we need to write a CAPTCHA image acquisition interface and login processing interface, and then write Ajax on the login page HTML.Before the

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9 Powerful, free PHP libraries ? 1. ReCAPTCHA ReCAPTCHA?? Allow your site to integrate with an advanced CAPTCHA system that can help you block some spam messages. The visual Captcha also has a useful sound function. In addition, in the reCAPTCHA

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Apache Shiro is a powerful and easy-to-integrate open-source rights framework that enables authentication, authorization, encryption, session management, and more. Authentication and authorization are the core of authority control, simply,

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Modified a very good php verification code (supporting Chinese ). Php captcha. class. php copy code :? PhpclassCaptcha {private $ width; private $ height; private $ codeNum; private $ code; private $ im; function _ const Php verification codeCaptcha.