PHP和MySQL - 比較存儲的IP

Question

我正在嘗試創建一個系統來存儲最后登錄的IP，並將其與當前的IP進行比較，然后在以后的某些功能中執行某些功能，但是目前，我無法在不進行最后一個else語句的情況下對它們進行比較。 這是代碼。

<?php

$userToPull = $session->userinfo['username'];

$query = "SELECT * FROM users WHERE username='$userToPull'";
            $result = mysql_query($query);      

            while($row = mysql_fetch_row($result)){

                    $userToShow = $row[25];
                    $IPtoVerify = $row[26];

                    }

$lastActivity = RelativeTime($userToShow);
$currIP = $_SERVER['REMOTE_ADDR'];

/*

Shows Partner Stuff

}elseif(!$session->isAdmin()){

echo "<div style='text-align:right;' id='homebox'";
echo "<b>Partner Total:</b> ".$database->getNumMembers()."<br>";
echo $database->num_active_users." partners logged in and ";
echo $database->num_active_guests." guests viewing the site.<br><br>";
echo "</div>";

*/


if(!$IPtoVerify == $currIP){

echo "<div style='text-align:right; background-color: #FAAAB3' id='homebox_partner'";
echo "<b>You are logged on from an unrecognized location.</b><br>";
echo "You will be sent a notification for security purposes.";
echo "<br>This location will automatically be remembered.";
echo "</div><br>";

}elseif($IPtoVerify == $currIP){

echo "<div style='text-align:right;' id='homebox_partner'";
echo "<b>You are logged on from a recognized location.</b><br>";
echo "Your IP is ".$_SERVER['REMOTE_ADDR'];
echo "<br>Your last login was approximately ".$lastActivity;
echo "</div><br>";

}else{

echo "<div style='text-align:right;' id='homebox_partner'";
echo "<b>An error has occurred.</b><br>";
echo "</div><br>";


}

?>

唯一不起作用的是if(!$IPtoVerify == $currIP){ if語句。

IP以正常方式存儲，回聲類似於：100.100.100.100。 （正常時尚）

也許我沒有比較正確，但它在過去對我有用。

Answer 1

此代碼不符合您的想法：

if (!$IPtoVerify == $currIP) {

PHP將其解釋為：

if ((!$IPtoVerify) == $currIP) {

你會想把它寫成：

if ($IPtoVerify != $currIP) {

Answer 2

嘗試($IPtoVerify !== $currIP)而不是(!$IPtoVerify == $currIP)

Answer 3

!$IPtoVerify == $currIP

手段

0==$currIP, 

因為它首先驗證

`!$IPtoVerify` 

除非$ IPtoVerify為1，否則它總是返回0。

添加額外的括號，如

if(!($IPtoVerify == $currIP))...

解決問題。