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When I am making a timed appointment, there is a verification condition in the form that determines whether the current time has reached the set time point. If it has not arrived, it cannot be executed

<?php
ini_set('date.timezone','Asia/Shanghai');
$setTime = date("Y-m-d");
$setTime = strtotime("$setTime 10:30:00");
 if(time() < $setTime){
     exit("The appointment time has not arrived, please visit later");
 }
?>

<form>……</form>

According to logic, if the time is not up, the form content cannot be accessed and submitted
But through the plug-in record of the form verification code, I can see that around 10:29:40, there is already a user Completed the verification code verification in the form
When we tested it ourselves, we didn’t know how the user operated
(PS: We used Alibaba Cloud’s drag verification for verification, and each verification has a recorded value. , as shown below)
< /span>

Does anyone know where the loopholes in this logic are and how they should be restricted?