我收到警告：session_start()[function.session-start]：无法发送会话缓存限制器 – 已发送的标头(输出在错误时启动)
如果我将表单数据提交到不同的文件进行处理,则可以正常工作.但是,如果我将表单数据提交到同一页面,则会出现此错误.
请提出
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<Meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<link href="style.css" rel="stylesheet" type="text/css" />
<title>Welcome</title>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript">
$(document).ready(function () {
$('#nav li').hover(
function () {
//show its submenu
$('ul', this).slideDown(100);
},
function () {
//hide its submenu
$('ul', this).slideUp(100);
}
);
});
</script>
</head>
<body>
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td class="header"> </td>
</tr>
<tr>
<td class="menu"><table align="center" cellpadding="0" cellspacing="0" width="80%">
<tr>
<td>
<ul id="nav">
<li><a href="#">Catalog</a>
<ul><li><a href="#">Products</a></li>
<li><a href="#">Bulk Upload</a></li>
</ul>
<div class="clear"></div>
</li>
<li><a href="#">Purchase </a>
</li>
<li><a href="#">Customer Service</a>
<ul>
<li><a href="#">Contact Us</a></li>
<li><a href="#">CS Panel</a></li>
</ul>
<div class="clear"></div>
</li>
<li><a href="#">All Reports</a></li>
<li><a href="#">Configuration</a>
<ul> <li><a href="#">Look and Feel </a></li>
<li><a href="#">Business Details</a></li>
<li><a href="#">CS Details</a></li>
<li><a href="#">Emaqil Template</a></li>
<li><a href="#">Domain and Analytics</a></li>
<li><a href="#">Courier</a></li>
</ul>
<div class="clear"></div>
</li>
<li><a href="#">Accounts</a>
<ul><li><a href="#">Ledgers</a></li>
<li><a href="#">Account Details</a></li>
</ul>
<div class="clear"></div></li>
</ul></td></tr></table></td>
</tr>
<tr>
<td valign="top"><table width="80%" border="0" align="center" cellpadding="0" cellspacing="0">
<tr>
<td valign="top"><table width="100%" border="0" cellspacing="0" cellpadding="2">
<tr>
<td width="22%" height="327" valign="top"><table width="100%" border="0" cellspacing="0" cellpadding="2">
<tr>
<td> </td>
</tr>
<tr>
<td height="45"><strong>-> Products</strong></td>
</tr>
<tr>
<td height="61"><strong>-> Categories</strong></td>
</tr>
<tr>
<td height="48"><strong>-> Sub Categories</strong></td>
</tr>
</table></td>
<td width="78%" valign="top"><table width="100%" border="0" cellpadding="0" cellspacing="0">
<tr>
<td> </td>
</tr>
<tr>
<td>
<table width="90%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td width="26%"> </td>
<td width="74%"><h2>Manage Categories</h2></td>
</tr>
</table></td>
</tr>
<tr>
<td height="30">
</td>
</tr>
<tr>
<td>
</td>
</tr>
<tr>
<td>
<table width="49%" align="center" cellpadding="0" cellspacing="0">
<tr><td>
<?PHP
if (isset($_SESSION['error']))
{
echo "<span id=\"error\"><p>" . $_SESSION['error'] . "</p></span>";
unset($_SESSION['error']);
}
?>
<form action="<?PHP echo $_SERVER['PHP_SELF']; ?>" method="post" enctype="multipart/form-data">
<p>
<label class="style4">Category Name</label>
<input type="text" name="categoryname" /><br /><br />
<label class="style4">Category Image</label>
<input type="file" name="image" /><br />
<input type="hidden" name="MAX_FILE_SIZE" value="100000" />
<br />
<br />
<input type="submit" id="submit" value="UPLOAD" />
</p>
</form>
<?PHP
session_start();
require("includes/conn.PHP");
function is_valid_type($file)
{
$valid_types = array("image/jpg", "image/jpeg", "image/bmp", "image/gif", "image/png");
if (in_array($file['type'], $valid_types))
return 1;
return 0;
}
function showContents($array)
{
echo "<pre>";
print_r($array);
echo "</pre>";
}
$TARGET_PATH = "images/category";
$cname = $_POST['categoryname'];
$image = $_FILES['image'];
$cname = MysqL_real_escape_string($cname);
$image['name'] = MysqL_real_escape_string($image['name']);
$TARGET_PATH .= $image['name'];
if ( $cname == "" || $image['name'] == "" )
{
$_SESSION['error'] = "All fields are required";
header("Location: managecategories.PHP");
exit;
}
if (!is_valid_type($image))
{
$_SESSION['error'] = "You must upload a jpeg, gif, or bmp";
header("Location: managecategories.PHP");
exit;
}
if (file_exists($TARGET_PATH))
{
$_SESSION['error'] = "A file with that name already exists";
header("Location: managecategories.PHP");
exit;
}
if (move_uploaded_file($image['tmp_name'], $TARGET_PATH))
{
$sql = "insert into Categories (CategoryName, FileName) values ('$cname', '" . $image['name'] . "')";
$result = MysqL_query($sql) or die ("Could not insert data into DB: " . MysqL_error());
header("Location: mangaecategories.PHP");
exit;
}
else
{
$_SESSION['error'] = "Could not upload file. Check read/write persmissions on the directory";
header("Location: mangagecategories.PHP");
exit;
}
?>
<?PHP
require("includes/conn.PHP");
$sql = "select CategoryID, CategoryName, FileName, Status from Categories";
$result = MysqL_query($sql) or die ("Could not access DB: " . MysqL_error());
while ($row = MysqL_fetch_assoc($result))
{
echo "<table border='0' cellpadding='10'>";
echo "<tr><td> </td><td>Category ID</td><td>Category Name</td><td>Status</td><td>Edit</td><td>Delete</td></tr>";
echo "<tr><td> <img src=\"images/" . $row['FileName'] . "\" alt=\"\" /> </td>";
echo "<td>". $row['CategoryID'] . "</td>";
echo "<td>". $row['CategoryName'] . "</td>";
echo "<td>". $row['Status']. "</td>";
echo "<td> <a href= 'edit.PHP?CategoryID=" .$row['id']. "'> Edit </a></td>";
echo "<td> <a href= 'delete.PHP?CategoryID=" .$row['id']. "'> Edit </a></td>";
echo "</tr> </table>";
}
?>
这里什么都没发生.请建议
解决方法:
你会发现我在页面的最顶部添加了session_start().我还在页面后面删除了session_start()调用.这个页面应该工作正常.
<?PHP
session_start();
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<Meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<link href="style.css" rel="stylesheet" type="text/css" />
<title>Welcome</title>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript">
$(document).ready(function () {
$('#nav li').hover(
function () {
//show its submenu
$('ul', this).slideDown(100);
},
function () {
//hide its submenu
$('ul', this).slideUp(100);
}
);
});
</script>
</head>
<body>
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td class="header"> </td>
</tr>
<tr>
<td class="menu"><table align="center" cellpadding="0" cellspacing="0" width="80%">
<tr>
<td>
<ul id="nav">
<li><a href="#">Catalog</a>
<ul><li><a href="#">Products</a></li>
<li><a href="#">Bulk Upload</a></li>
</ul>
<div class="clear"></div>
</li>
<li><a href="#">Purchase </a>
</li>
<li><a href="#">Customer Service</a>
<ul>
<li><a href="#">Contact Us</a></li>
<li><a href="#">CS Panel</a></li>
</ul>
<div class="clear"></div>
</li>
<li><a href="#">All Reports</a></li>
<li><a href="#">Configuration</a>
<ul> <li><a href="#">Look and Feel </a></li>
<li><a href="#">Business Details</a></li>
<li><a href="#">CS Details</a></li>
<li><a href="#">Emaqil Template</a></li>
<li><a href="#">Domain and Analytics</a></li>
<li><a href="#">Courier</a></li>
</ul>
<div class="clear"></div>
</li>
<li><a href="#">Accounts</a>
<ul><li><a href="#">Ledgers</a></li>
<li><a href="#">Account Details</a></li>
</ul>
<div class="clear"></div></li>
</ul></td></tr></table></td>
</tr>
<tr>
<td valign="top"><table width="80%" border="0" align="center" cellpadding="0" cellspacing="0">
<tr>
<td valign="top"><table width="100%" border="0" cellspacing="0" cellpadding="2">
<tr>
<td width="22%" height="327" valign="top"><table width="100%" border="0" cellspacing="0" cellpadding="2">
<tr>
<td> </td>
</tr>
<tr>
<td height="45"><strong>-> Products</strong></td>
</tr>
<tr>
<td height="61"><strong>-> Categories</strong></td>
</tr>
<tr>
<td height="48"><strong>-> Sub Categories</strong></td>
</tr>
</table></td>
<td width="78%" valign="top"><table width="100%" border="0" cellpadding="0" cellspacing="0">
<tr>
<td> </td>
</tr>
<tr>
<td>
<table width="90%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td width="26%"> </td>
<td width="74%"><h2>Manage Categories</h2></td>
</tr>
</table></td>
</tr>
<tr>
<td height="30">
</td>
</tr>
<tr>
<td>
</td>
</tr>
<tr>
<td>
<table width="49%" align="center" cellpadding="0" cellspacing="0">
<tr><td>
<?PHP
if (isset($_SESSION['error']))
{
echo "<span id=\"error\"><p>" . $_SESSION['error'] . "</p></span>";
unset($_SESSION['error']);
}
?>
<form action="<?PHP echo $_SERVER['PHP_SELF']; ?>" method="post" enctype="multipart/form-data">
<p>
<label class="style4">Category Name</label>
<input type="text" name="categoryname" /><br /><br />
<label class="style4">Category Image</label>
<input type="file" name="image" /><br />
<input type="hidden" name="MAX_FILE_SIZE" value="100000" />
<br />
<br />
<input type="submit" id="submit" value="UPLOAD" />
</p>
</form>
<?PHP
require("includes/conn.PHP");
function is_valid_type($file)
{
$valid_types = array("image/jpg", "image/jpeg", "image/bmp", "image/gif", "image/png");
if (in_array($file['type'], $valid_types))
return 1;
return 0;
}
function showContents($array)
{
echo "<pre>";
print_r($array);
echo "</pre>";
}
$TARGET_PATH = "images/category";
$cname = $_POST['categoryname'];
$image = $_FILES['image'];
$cname = MysqL_real_escape_string($cname);
$image['name'] = MysqL_real_escape_string($image['name']);
$TARGET_PATH .= $image['name'];
if ( $cname == "" || $image['name'] == "" )
{
$_SESSION['error'] = "All fields are required";
header("Location: managecategories.PHP");
exit;
}
if (!is_valid_type($image))
{
$_SESSION['error'] = "You must upload a jpeg, gif, or bmp";
header("Location: managecategories.PHP");
exit;
}
if (file_exists($TARGET_PATH))
{
$_SESSION['error'] = "A file with that name already exists";
header("Location: managecategories.PHP");
exit;
}
if (move_uploaded_file($image['tmp_name'], $TARGET_PATH))
{
$sql = "insert into Categories (CategoryName, FileName) values ('$cname', '" . $image['name'] . "')";
$result = MysqL_query($sql) or die ("Could not insert data into DB: " . MysqL_error());
header("Location: mangaecategories.PHP");
exit;
}
else
{
$_SESSION['error'] = "Could not upload file. Check read/write persmissions on the directory";
header("Location: mangagecategories.PHP");
exit;
}
?>
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