往手机下发验证码功能如何实现？（最好有实例）
往手机上发验证码功能怎么实现？急（最好有实例）
现在订购或者注册，需要输入手机号，然后往手机上发验证码，用户输入验证码后才能订购或注册完成，这个功能怎么具体怎么实现，希望有实例，谢谢
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SESSION里存个验证码, 发个短信给你, 你输入验证码, 提交表单, 验证是否和SESSION里记录的一样.
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到网上找短信接口，他会给你php集成的类或者函数。你开发好了，就可以用了。
接口都是收费的。好点的接口，1毛一条短信。一般的接口能便宜点。
而且目前短信接口都有些问题，有的省份收不到短信。
也就是说：有一万个注册用户，你至少付出1000块钱的成本！
大公司都是直接和移动联通签的合同。小网站是不可能做到的。
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没人会耗费宝贵时间给你详细讲解实例的。
反正我是忙着赶工呢！查找技术问题，纯属路过，看到初学者，就大概解答下！
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首先你得去运营商申请一下，他们会提供API及API文档，功能实现相当简单，有些仅需要 CURL或者file_get_contents 请求一个带有规则 的参数即可发送
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