How to prevent PHP form from refreshing and submitting, PHP form refresh and submit_PHP tutorial

How to prevent refresh submission of PHP form, PHP form refresh submission

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

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When outputting the form page: (Give me an example, it’s not perfect)
$intFlag = md5(time());
$strFlag = 'flag_$intFlag';
$_SESSION["$strFlag"] = 1;


Then when accepting data:
$action_flag = trim($_POST["action_flag"]);
if ($action_flag!="" && $_SESSION["$action_flag"]==1)
{
$_SESSION["$action_flag"] = 2;
//Process data
}
else
{
die("Duplicate submission or other errors");
}

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