嘗試獲取非對象的屬性

此腳本很好。我把它稱爲我的腳本之上。但是，如果沒有被禁止用戶進入該網站，他們得到：嘗試獲取非對象的屬性

Notice: Trying to get property of non-object in index.php on line 20

功能：

// Check if conecting user is banned. If ban has expired delete row. 
function check_bans() 
{ 

// IP address 
$user_ip = $_SERVER['REMOTE_ADDR']; 

$query = mysql_query("SELECT ip, expire FROM bans WHERE ip = '$user_ip'"); 
$row = mysql_fetch_object($query); 

$expire = $row->expire ? date('M d Y H:i', $row->expire) : 'Never'; 

// Did we find a match? 
if (mysql_num_rows($query)) { 

    // Has this ban expired? Then delete and let user inside. 
    if ($row->expire != '' && $row->expire <= time()) 
     mysql_query("DELETE FROM bans WHERE ip = '$user_ip'") or die (mysql_error()); 
    else 
     die("<h1 align=\"center\" style=\"color:maroon\">You have been IP banished. Ban will be lifted: $expire</h1>"); 

} 

}

來源

2010-07-22 Damjan Krowalka

因爲如果用戶沒有被禁止，查詢產量爲零結果和$row分配gets assigned false （並且不是的一個對象）。所以，這個錯誤發生是因爲你試圖調用一個布爾方法。請嘗試：

function check_bans() { 

    // IP address 
    $user_ip = $_SERVER['REMOTE_ADDR']; 

    $query = mysql_query("SELECT ip, expire FROM bans WHERE ip = '$user_ip'"); 
    $row = mysql_fetch_object($query); 
    if($row) { 

     $expire = $row->expire ? date('M d Y H:i', $row->expire) : 'Never'; 

     // Has this ban expired? Then delete and let user inside. 
     if ($row->expire != '' && $row->expire <= time()) 
      mysql_query("DELETE FROM bans WHERE ip = '$user_ip'") or die (mysql_error()); 
     else 
      die("<h1 align=\"center\" style=\"color:maroon\">You have been IP banished. Ban will be lifted: $expire</h1>"); 

    } 
}

來源

2010-07-22 00:26:19 karim79

其實我覺得'if（mysql_num_rows（$ query））'是多餘的。 – 2010-07-22 00:33:56

@Felix - 你是對的，它看起來如此。將刪除。 – karim79 2010-07-22 00:36:53

如果沒有匹配的行，則$row將爲FALSE。你應該在mysql_fetch_object之後加上if ($row)。

來源

2010-07-22 00:27:50

嘗試獲取非對象的屬性

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