此页面在没有运行验证过程的情况下进行重定向，如果我注释掉标头重定向，则所有进程都会正常工作，当页面加载时，只要我取消注释标头标记，它就会自动重定向，此页面是根据我创建的成员注册页面建模的，该页面运行良好，没有此问题，所以我看不到问题，请有人好心帮我解决这个问题好吗。
以下是标题标签注释掉的页面代码
<?php
include_once 'functions.php';
//Start session
sec_session_start();
//Check whether the session variable SESS_MEMBER_ID is present or not
if(!isset($_SESSION['sess_user_id']) || (trim($_SESSION['sess_user_id']) == '')) {
header("location: login.php");
exit();
}
if(!isset($_SESSION['login']) == '1') {
header("location: admin_login.php");
exit();
}
?>
<?php
//display users info with checkbox to delete
$sql = "SELECT * FROM `links` LIMIT 0, 30 ";
$result = mysqli_query($mysqli, $sql);
?>
<?php
// define variables and set to empty values
$link_titleErr = $type_of_linkErr = $web_linkErr = "";
$link_title = $type_of_link = $web_link = "";
if ($_SERVER["REQUEST_METHOD"] == "POST") {
$link_title = test_input($_POST["link_title"]);
$type_of_link = test_input($_POST["select"]);
$web_link = test_input($_POST["web_link"]);
}
function test_input($data) {
$data = trim($data);
$data = stripslashes($data);
return $data;
}
if ($_SERVER["REQUEST_METHOD"] == "POST") {
if (empty($_POST["link_title"])) {
$link_titleErr = "**Link Title is required**";
} else {
$link_title = test_input($_POST["link_title"]);
if (!preg_match("/^[a-zA-Z ]*$/",$link_title)) {
$link_titleErr = "**Only letters and white space allowed**";
}
}
if (empty($_POST["web_link"])) {
$web_linkErr = "**Web Link is required**";
} else {
// do nothing
}
if($_POST['select'] == "") {
$type_of_linkErr = "**Type of Link is required**";
}
else {
// do nothing
}
}
if ($link_titleErr == '' && $web_linkErr == '' && $type_of_linkErr == '') {
$_SESSION['data'] = array($_POST['link_title'],$_POST['web_link'],$_POST['type_of_link']);
//header("Location: add_link.inc.php");
}
?>
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Add Links</title>
<link href="../styles/main.css" rel="stylesheet" type="text/css">
</head>
<div class="nav"><table width="100%" border="0" align="center" cellpadding="2" cellspacing="2">
<tr>
<td width="20%" bgcolor="#980002"><div align="center"><a href="https://www.thamesvalleycoalition.co.uk/includes/admin_login.php" title="About Us" target="_self">ADMIN</a></div></td>
<td width="20%" bgcolor="#980002"><div align="center"><a href="https://www.thamesvalleycoalition.co.uk/includes/forum.php" title="Event Diary" target="_self">FORUM</a></div></td>
<td width="20%" bgcolor="#980002"><div align="center"><a href="https://www.thamesvalleycoalition.co.uk/includes/add_pictures.php" title="Photo Gallery" target="_self">ADD PICTURES</a></div></td>
<td width="20%" bgcolor="#980002"><div align="center"><a href="https://www.thamesvalleycoalition.co.uk/includes/add_links.php" title="Biker Friendly" target="_self">ADD LINKS</a></div></td>
<td width="%" bgcolor="#980002"><div align="center"><a href="https://www.thamesvalleycoalition.co.uk/includes/add_events.php" title="Links" target="_self">ADD EVENTS</a></div></td>
</tr>
<td height="4"></tr>
</table>
</div>
<div class="subheader">ADD LINKS</div>
<div class="header"><a href="https://thamesvalleycoalition.co.uk/includes/logout.php">logout</a></div>
<div class="content">
<div id="links_form">
<form action="add_link.inc.php" method="post" id="links_form">
<fieldset>
<legend>Add Link</legend>
<table width="100%">
<tbody>
<tr>
<td width="33%"><div>
<div align="right">Link Title:</div>
</div></td>
<td width="33%"><div id="form_box">
<input name="link_title" type="text" id="link_title" value="<?php echo $link_title;?>" size="40">
</div></td>
<td width="33%"><div align="left"><span class="error" style="color: red"><?php echo $link_titleErr;?></span></div></td>
</tr>
<tr>
<td width="33%"><div align="right">Website Link:</div></td>
<td width="33%"><div id="form_box">
<input name="web_link" type="text" id="web_link" value="<?php echo $web_link;?>" size="40">
</div></td>
<td width="33%"><div align="left"><span class="error" style="color: red" ><?php echo $web_linkErr;?></span></div></td>
</tr>
<tr>
<td width="33%"><div align="right">Type of Business or Service:</div></td>
<td width="33%"><div id="form_box">
<select name="select" id="select">
<option value="">SELECT TYPE OF LINK</option>
<option value="Pub/Restaurant">Pub/Restaurant</option>
<option value="Shop/Store">Shop/Store</option>
<option value="Motorcycle/Car">Motorcycle/Car</option>
<option value="Other">Other</option>
</select>
</div></td>
<td width="33%"><div align="left"><span class="error" style="color: red"><?php echo $type_of_linkErr;?></span></div></td>
</tr>
<tr>
<td> </td>
<td><div align="center">
<input type="submit" name="submit" id="submit" value="Add Link" formaction="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>" formmethod="post">
</div></td>
<td> </td>
</tr>
</tbody>
</table>
</fieldset>
</form>
</div>
<p> </p>
<div id="delete_link"><form><fieldset><legend>Delete Link</legend>
<?php while($row = mysqli_fetch_array($result)): ?>
<label>
<input type="checkbox" value="<?php echo $row['linkid']; ?>" name="delete[]" />
<?php echo $row['linkid']; ?> - <?php echo $row['link_title']; ?> - <?php echo $row['type_of_link']?> - <?php echo $row['web_link']?> <?php echo '<br/>'?>
</label>
<?php endwhile; ?>
<br>
<input name="submit" type="submit" value="Delete Link" formmethod="post" formaction="delete_link.inc.php"/>
</p>
<p> </p>
</form>
</form></div>
</div>
<div class="footer" >All contents on this site are Copyright of the TVC.</div>
</body>
</html>
更改此行：
if(!isset($_SESSION['login']) == '1') {
至
if(isset($_SESSION['login']) && $_SESSION['login'] == '1') {