PHP forms prevent refresh and submission methods. php forms refresh and submission _ PHP Tutorial

PHP forms prevent refreshing and submission methods. php forms are refreshed and submitted. Certificate ------------------------------------------------------------------ PHP forms prevent refreshing and submitting php forms.

From http://bbs.chinaunix.net/thread-667547-1-1.html

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When outputting the form page: (for example, it is not perfect)
$ IntFlag = md5 (time ());
$ StrFlag = 'flag _ $ intFlag ';
$ _ SESSION ["$ strFlag"] = 1;


When receiving data:
$ Action_flag = trim ($ _ POST ["action_flag"]);
If ($ action_flag! = "" & $ _ SESSION ["$ action_flag"] = 1)
{
$ _ SESSION ["$ action_flag"] = 2;
// Process data
}
Else
{
Die ("repeated submission or other errors ");
}

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