How to disable the email confirmation link after few seconds in php - php

Question

Hi I am sending confirmation e-mail after signup.How can the link be expired after a few seconds can anyone suggest me.Because if i click on the link after few days also it is getting activated.That should not be happen.Here is my code:
<?php
session_start();
$sessionCaptcha = $_SESSION['vercode'];
$inputStream = file_get_contents("php://input");
$data = json_decode($inputStream);
$connection = mysql_connect("localhost", "enjoytax_account", "account") or die(mysql_error());
$db = mysql_select_db("enjoytax_accounting", $connection);
if($db)
{
$confirm_code=md5(uniqid(rand()));
$username = $data->username;
$email = $data->email;
$password = md5($data->password);
$confirmpassword = md5($data->confirmpassword);
$mobileno = $data->mobileno;
$captcha=$data->captcha;
$check=mysql_query("select email from register where email = '$email'");
$num_rows = mysql_num_rows($check);
if ($num_rows == 0)
{
if($captcha == $sessionCaptcha)
{
$query = mysql_query("insert into register(username,email, password, repassword,mobile,confirm_code) values ('$username','$email', '$password' , '$confirmpassword', '$mobileno','$confirm_code')");
if ($query)
{
$from .= 'info#mail.com' . "\r\n\r\n";
$to = $data->email;
$subject="Your confirmation link here";
$message.="Click on this link to activate your account \r\n";
$message.="http://www.example.com/model/confirmation.php?email=$email&passkey=$confirm_code";
$success = mail($to, $subject, $message);
$successJson='{"success":"We have sent a verification email ' .
'to your email id '.$email.', please check your ' .
'Inbox and verify your email in order to proceed further."}';
print_r($successJson);
}else{
$failureJson='{"error":"We are encountering some issue. Please try after some time."}';
print_r($failureJson);
}
}else{
$failureJson='{"error":"Please Enter Correct Captcha."}';
print_r($failureJson);
}
}else{
$failureJson='{"error":"Email-Id already Exists."}';
print_r($failureJson);
}
}
?>

Answer 1

I have not tested the code but this might help you.
session_start();
if ($query)
{
$from .= 'info#mail.com' . "\r\n\r\n";
$to = $data->email;
$subject="Your confirmation link here";
$message.="Click on this link to activate your account \r\n";
$message.="http://www.example.com/model/confirmation.php?email=$email&passkey=$confirm_code";
$success = mail($to, $subject, $message);
$successJson='{"success":"We have sent a verification email ' .
'to your email id '.$email.', please check your ' .
'Inbox and verify your email in order to proceed further."}';
$_SESSION['now'] = date('i:s');
$now =date('Y-m-d H:i:s');
$futureDate = $now+(60*5);
$formatDate = date("Y-m-d H:i:s", $futureDate);
if($_SESSION['now'] > $formatDate)
{
$failureJson='{"error":"We are encountering some issue. Please try after some time."}';
print_r($failureJson);
}
}
else
{
echo " Query Not Executed";
}