我遇到了问题。我已经找到了解决方案但没有任何改变。
警告消息仍然显示：
信息 - 已经发送的标题（输出开始于 C：\ xampp \ htdocs \ PRFFWC \ edit.php：82）在C：\ xampp \ htdocs \ PRFFWC \ edit.php中 在线199
这是我收到此警告的行：
<input type="text" name="palali" value=<?php echo $row['palali']; ?>>
header('Location:index.php');}
任何人都可以帮我解决这个问题吗？
我的代码
<?php
include ('db.php');
include ('header.php');
$ID=$_GET['id'];
?>
<html>
<body>
<div class="container">
<div class="hero-unit-header">
<div class="container-con">
<!-- end banner & menunav -->
<div class="container">
<div class="row-fluid">
<div class="span12">
<div class="row-fluid">
<div class="span3"></div>
<div class="span6">
<div class="hero-unit-3">
<center>
<?php
$sql= "select * from rainfallstations_copy where id='$ID'" ;
$result = mysqli_query($con,$sql) or die('Error: ' . mysqli_error($con));
$row=mysqli_fetch_array($result);
?>
<form class="form-horizontal" method="post" enctype="multipart/form-data" style="float: right;">
<legend>
<h4>Edit</h4></legend>
<h4>PRFFWC Records</h4>
<hr>
<div class="control-group">
<label class="control-label" for="inputmunoz">Munoz:</label>
<div class="controls">
<input type="text" name="munoz" value=<?php echo $row[ 'munoz']; ?>>
</div>
</div>
<div class="control-group">
<label class="control-label" for="inputsapang_buho">Sapang Buho:</label>
<div class="controls">
<input type="text" name="sapang_buho" value=<?php echo $row[ 'sapang_buho']; ?>>
</div>
</div>
<div class="control-group">
<label class="control-label" for="inputgabaldon">Gabaldon:</label>
<div class="controls">
<input type="text" name="gabaldon" value=<?php echo $row[ 'gabaldon']; ?>>
</div>
</div>
<div class="control-group">
<label class="control-label" for="inputzaragoza">Zaragoza:</label>
<div class="controls">
<input type="text" name="zaragoza" value=<?php echo $row[ 'zaragoza']; ?>>
</div>
</div>
<div class="control-group">
<label class="control-label" for="inputmayapyap">Mayapyap</label>
<div class="controls">
<input type="text" name="mayapyap" value=<?php echo $row[ 'mayapyap']; ?>>
</div>
</div>
<div class="control-group">
<label class="control-label" for="inputpenaranda">Penaranda:</label>
<div class="controls">
<input type="text" name="penaranda" value=<?php echo $row[ 'penaranda']; ?>>
</div>
</div>
<div class="control-group">
<label class="control-label" for="inputcalaanan">Calaanan:</label>
<div class="controls">
<input type="text" name="calaanan" value=<?php echo $row[ 'calaanan']; ?>>
</div>
</div>
<div class="control-group">
<label class="control-label" for="inputpalali">Palali:</label>
<div class="controls">
<input type="text" name="palali" value=<?php ob_start() echo $row[ 'palali']; ?>>
</div>
</div>
<div class="control-group">
<label class="control-label" for="inputsan_isidro">San Isidro:</label>
<div class="controls">
<input type="text" name="san_isidro" value=<?php echo $row[ 'san_isidro']; ?>>
</div>
</div>
<div class="control-group">
<label class="control-label" for="inputarayat">Arayat:</label>
<div class="controls">
<input type="text" name="arayat" value=<?php echo $row[ 'arayat']; ?>>
</div>
</div>
<div class="control-group">
<label class="control-label" for="inputcandaba">Candaba:</label>
<div class="controls">
<input type="text" name="candaba" value=<?php echo $row[ 'candaba']; ?>>
</div>
</div>
<div class="control-group">
<label class="control-label" for="inputsibul_spring">Sibul Spring:</label>
<div class="controls">
<input type="text" name="sibul_spring" value=<?php echo $row[ 'sibul_spring']; ?>>
</div>
</div>
<div class="control-group">
<label class="control-label" for="inputsasmuan">Sasmuan:</label>
<div class="controls">
<input type="text" name="sasmuan" value=<?php echo $row[ 'sasmuan']; ?>>
</div>
</div>
<div class="control-group">
<label class="control-label" for="inputsulipan">Sulipan:</label>
<div class="controls">
<input type="text" name="sulipan" value=<?php echo $row[ 'sulipan']; ?>>
</div>
</div>
<div class="control-group">
<label class="control-label" for="inputmexico">Mexico:</label>
<div class="controls">
<input type="text" name="mexico" value=<?php echo $row[ 'mexico']; ?>>
</div>
</div>
<div class="control-group">
<label class="control-label" for="inputporac">Porac:</label>
<div class="controls">
<input type="text" name="porac" value=<?php echo $row[ 'porac']; ?>>
</div>
</div>
<div class="control-group">
<label class="control-label" for="inputsan_rafael">San Rafael:</label>
<div class="controls">
<input type="text" name="san_rafael" value=<?php echo $row[ 'san_rafael']; ?>>
</div>
</div>
<div class="control-group">
<div class="controls">
<button type="submit" name="update" class="btn btn-success" style="margin-right: 65px;">Save</button>
<a href="index.php" class="btn">Back</a>
</div>
</div>
</form>
<?php
$id=$_REQUEST['id'];
$sql= "select * from rainfallstations_copy where id='$ID'" ;
$result = mysqli_query($con,$sql) or die('Error: ' . mysqli_error($con));
$test = mysqli_fetch_array($result);
if (!$result)
{
die("Error: Data not found..");
}
else
{
$munoz= $test['munoz'];
$sapang_buho= $test['sapang_buho'];
$gabaldon= $test['gabaldon'];
$zaragoza= $test['zaragoza'];
$mayapyap= $test['mayapyap'];
$penaranda= $test['penaranda'];
$calaanan= $test['calaanan'];
$palali= $test['palali'];
$san_isidro= $test['san_isidro'];
$arayat= $test['arayat'];
$candaba= $test['candaba'];
$sibul_spring= $test['sibul_spring'];
$sasmuan= $test['sasmuan'];
$sulipan= $test['sulipan'];
$mexico= $test['mexico'];
$porac= $test['porac'];
$san_rafael= $test['san_rafael'];
if (isset($_POST['update'])) {
$munoz_save= $_POST['munoz'];
$sapang_buho_save= $_POST['sapang_buho'];
$gabaldon_save= $_POST['gabaldon'];
$zaragoza_save= $_POST['zaragoza'];
$mayapyap_save= $_POST['mayapyap'];
$penaranda_save= $_POST['penaranda'];
$calaanan_save= $_POST['calaanan'];
$palali_save= $_POST['palali'];
$san_isidro_save= $_POST['san_isidro'];
$arayat_save= $_POST['arayat'];
$candaba_save= $_POST['candaba'];
$sibul_spring_save= $_POST['sibul_spring'];
$sasmuan_save= $_POST['sasmuan'];
$sulipan_save= $_POST['sulipan'];
$mexico_save= $_POST['mexico'];
$porac_save= $_POST['porac'];
$san_rafael_save= $_POST['san_rafael'];
$sql= "UPDATE rainfallstations_copy SET munoz = '$munoz_save' , sapang_buho = '$sapang_buho_save' , gabaldon ='$gabaldon_save', zaragoza = '$zaragoza_save' , mayapyap ='$mayapyap_save',penaranda = '$penaranda_save' , calaanan = '$calaanan_save' , palali ='$palali_save',san_isidro = '$san_isidro_save' , arayat ='$arayat_save',candaba = '$candaba_save' , sibul_spring = '$sibul_spring_save' , sasmuan ='$sasmuan_save',sulipan = '$sulipan_save' , mexico ='$mexico_save',porac = '$porac_save' , san_rafael = '$san_rafael_save' WHERE id = '$id'" ;
$result = mysqli_query($con,$sql) or die('Error: ' . mysqli_error($con));
header('Location:index.php');}
}
?>
</center>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</body>
</html>
答案 0 :(得分：1)
问题是您要发送内容（请参阅<input type="text" name="palali" ...），之后您尝试发送标头（header('Location:index.php')。您必须在发送内容之前设置标头值。其他解决方案是使用ob_start函数打开输出缓冲。但是在将任何内容写入输出之前必须使用ob_start，所以在你的情况下你需要这个：
<?php ob_start();?>
<input type="text" name="palali" value=<?php echo $row['palali']; ?>>
header('Location:index.php');}
我想知道为什么在发送重定向标题时发送内容...
答案 1 :(得分：0)
headers already sent当您在标头之前首先发送内容时，通常会出现此错误。所以在发送标题之前没有输出！
必须在进行任何输出之前调用发送/修改HTTP标头的函数。
为避免此错误，请始终在ob_start之后添加<?php。
使用header永远不会忘记在标题后放置exit();或die()，还有一件事。