我一直坚持以下问题。
我一直收到以下错误：
Warning: Invalid argument supplied for foreach() in
/home/content/50/10835750/html/dogdays/game/table.class.php on line 32
Warning: Cannot modify header information - headers already sent by (output started at
/home/content/50/10835750/html/dogdays/game/table.class.php:32) in
/home/content/50/10835750/html/dogdays/game/loadplayer.php on line 77
Redirecting to /game/locations/
我的代码如下：
<?php
// First we execute our common code to connection to the database and start the session
define('MyConst', TRUE);
include('database.class.php');
include('table.class.php');
include('user.class.php');
include('characters.class.php');
include('pc/player.class.php');
include('pc/human.class.php');
include('loginattempts.class.php');
include('timer.class.php');
include('functions.php');
include('loginf.php');
$dbo = database::getInstance();
$dbo -> connect("*****************", "***********", "*********", "********",
array(PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES utf8'));
secSessionStart();
$_SESSION['page'] = "loadplayer.php";
// At the top of the page we check to see whether the user is logged in or not
if(empty($_SESSION['user']))
{
// If they are not, we redirect them to the login page.
header("Location: login.php");
// Remember that this die statement is absolutely critical. Without it,
// people can view your members-only content without logging in.
die("Redirecting to login.php");
}
// Everything below this point in the file is secured by the login system
// We can display the user's username to them by reading it from the session array.
Remember that because
// a username is user submitted content we must use htmlentities on it before
displaying it to the user.
?>
<?php
// if(empty($_SESSION['playercharacter'])) {
$character_id = "";
$queryString = $_SERVER['QUERY_STRING'];
$queryString = explode("&", $queryString);
if(strcmp(substr($queryString[0],0,2),"c=") == 0) {
$character_id = substr($queryString[0],2);
}
$c = new characters();
$c -> load($character_id);
$playercharacterobject = new human($c, null);
$_SESSION['playercharacter'] = $playercharacterobject;
try {
$stmt = $dbo->getConnection()->prepare("SELECT * FROM location WHERE
location_id = :location_id");
$query_params = array(':location_id'=>$playercharacterobject->location_id);
// Execute the prepared query.
$result = $stmt->execute($query_params);
}
catch(PDOException $ex) {
// Note: On a production website, you should not output $ex->getMessage().
// It may provide an attacker with helpful information about your code.
die("Failed to run query1: " . $ex->getMessage());
}
$rows = $stmt->fetch(PDO::FETCH_ASSOC);
$_SESSION['currentlocation'] = $rows['url'];
$validAccess = array("babelfloor.php");
$_SESSION['validAccess'] = $validAccess;
$_SESSION['prevlocation'] = "loadplayer.php";
// }
// echo $_SESSION['currentlocation'];
// echo $rows['url'];
// THIS IS LINE 77. THE ONE THAT IS CAUSING PROBLEMS
header("Location: /game/locations/".$_SESSION['currentlocation']);
die("Redirecting to /game/locations/".$_SESSION['currentlocation']);
// header("Location: combat.php");
// die("Redirecting to combat.php");
?>
和
<?php
/**
* @author Alvin Tung
* @copyright 2013
*/
if(!defined('MyConst')) {
die('Direct access not premitted');
}
class table {
protected $id = null;
protected $table = null;
function __construct() {
}
function bind($data) {
foreach ($data as $key=>$value) {
$this -> $key = $value;
}
}
function load($id) {
$this->id = $id;
$dbo = database::getInstance();
$sql = $this->buildQuery('load');
$row = $dbo->query($sql, array(':'.$this->table.'_id'=> $id));
// THIS IS LINE 32
foreach ($row as $key=>$value) {
if($key == "user_id()") {
continue;
}
$this->$key = $value;
}
}
// write database object contents to database
function store() {
$dbo = database::getInstance();
$array = array();
$classVars = get_object_vars($this);
if($this->id =="") {
foreach ($classVars as $key=>$value) {
if ($key == "id" || $key == "table") {
continue;
}
$array[":{$key}"] = $value;
}
}
else {
$array[':'.$this->table.'_id'] = $this->id;
}
$sql = $this -> buildQuery('store');
$dbo -> query($sql, $array);
}
function buildQuery($task) {
$sql = "";
if ($task == "store") {
// if no id value has been store in this object yet,
// add new record to the database, else just update the record.
if ($this->id == "") {
$keys = "";
$values = "";
$classVars = get_class_vars(get_class($this));
$sql .= "INSERT INTO {$this->table}";
foreach ($classVars as $key=>$value) {
if ($key == "id" || $key == "table") {
continue;
}
$keys .= "$key,";
$values .= ":$key,";
}
// NOTE: all substr($keys, 0, -1) does is gets rid of the comma
// at the on the last array element.
$sql .= "(".substr($keys, 0, -1).") Values (".substr($values, 0,
-1).")";
}
else {
$classVars = get_class_vars(get_class($this));
$sql .= "UPDATE {$this->table} SET ";
foreach ($classVars as $key=>$value) {
if ($key == "id" || $key == "table") {
continue;
}
$sql .= "{$key} = '{$this->$key}',";
}
$sql = substr($sql, 0, -1)." WHERE {$this->table}_id = :{$this-
>table}_id";
}
}
elseif ($task == "load") {
$sql = "SELECT * FROM {$this->table} WHERE {$this->table}_id = :
{$this->table}_id";
}
return $sql;
}
}
?>
我已经尝试将ob_start（）添加到loadplayer.php的顶部，正如大多数答案所建议的那样，但它只是输出一个空白页面。非常感谢您的见解。
答案 0 :(得分：1)
错误消息Invalid argument supplied for foreach()表示foreach的某些内容不是数组，也不是Traversable个对象。
鉴于这段代码：
$dbo = database::getInstance();
$sql = $this->buildQuery('load');
$row = $dbo->query($sql, array(':'.$this->table.'_id'=> $id));
// THIS IS LINE 32
foreach ($row as $key=>$value) {
很明显$row不是你所期望的。也许查询包含无效的sql或数据库中不存在id。您应该进行更多错误检查以正确处理这些情况。
消息headers already sent在这里并不重要。如果您解决了第一个问题，第二个问题也将消失。