向高手php post提交有关问题
向高手求教：php post提交问题
小虾做了一个程序：通过Ajax 技术调用后台PHP的执行过程 向Mysql写数据库，功能是实现了。
后来发现有用户通过 url直接拼凑参数手工通过网址输入方式调用php的执行过程。
问题1： 有什么好的办法可以禁止直接手工通过网址向后台提交呢？
我查了一些帮助，大意是提交前：通过时间t向后台提交获得相对应的加密键值k1,
在正式提交时，将t与k1都提交，后台通过t重新加密得出k2，如果k1与k2相同，则执行写入数据库过程。
问题2：这种方式，增加了获取键值k1这个过程，肯定比不获取k1多费时间。 有什么办法规避呢？
问题3：获取加密键值k1这个过程又如何保证不被别人直接手工通过网址向后台调用呢？
恳请高人指点！
谢谢先！
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