php判断如何执行一次？？？

Question

例如if(到期){
$sql = "update~~~~";
}怎么在到期以后执行一次sql语句呢？

Answer 1

http://blog.csdn.net/xiunai78/article/details/7391524
http://www.jb51.net/article/29135.htm
http://blog.csdn.net/yanlaizhishi/article/details/8564586