为什么编号为1的数据删不掉？别的都能删
这是主页面的代码
<?php
header('content-type:text/html;charset=utf-8');
date_default_timezone_set('PRC');
$filename="msg.txt";
$msgs=[];
//检测文件是否存在
if(file_exists($filename)){
//读取文件中的内容
$string=file_get_contents($filename);
if(strlen($string)>0){
$msgs=unserialize($string);//反序列化
}
}
//检测用户是否点击了提交按钮
if(isset($_POST['pubMsg'])){
$username=$_POST['username'];
$title=strip_tags($_POST['title']);//从字符串中去除 HTML 和 PHP 标记
$content=strip_tags($_POST['content']);
$time=time();
//将其组成关联数组
$data=compact('username','title','content','time');
//判断是编辑留言还是添加留言
if(isset($_POST['editkey'])){
$key=$_POST['editkey'];
$msgs[$key]=$data;
}
else{
array_push($msgs,$data);}
$msgs=serialize($msgs);
if(file_put_contents($filename,$msgs)) { //将一个字符串写入文件
if (isset($_POST['editkey'])) {
echo "<script>alert('编辑成功！');location.href='index.php';</script>";
} else {
echo "<script>alert('留言成功！');location.href='index.php';</script>";
}
}
else{
if(isset($_POST['editkey'])) {
echo "<script>alert('编辑失败，请重试！');location.href='index.php';</script>";
}else{
echo "<script>alert('留言失败，请重试！');location.href='index.php';</script>";
}
}
}
/*
$msgs=[
[...],
[...]
]；
file_get_contents($filename);得到文件中的内容，返回的是字符串
file_put_contents($filename,$data);向指定文件写内容，如果文件不存在，会创建
serialize($str);序列化字符串
unserialize($str);反序列化
*/
//print_r($msgs);
?>
<!DOCTYPE html>
<html>
<head>
<script type="text/javascript" src="http://www.francescomalagrino.com/BootstrapPageGenerator/3/js/jquery-2.0.0.min.js"></script>
<script type="text/javascript" src="http://www.francescomalagrino.com/BootstrapPageGenerator/3/js/jquery-ui"></script>
<link href="http://www.francescomalagrino.com/BootstrapPageGenerator/3/css/bootstrap-combined.min.css" rel="stylesheet" media="screen">
<script type="text/javascript" src="http://www.francescomalagrino.com/BootstrapPageGenerator/3/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container-fluid">
<div class="row-fluid">
<div class="span12">
<div class="page-header">
<h1>
留言板-<small>V1.0</small>
</h1>
</div>
<div class="hero-unit">
<h1>
Hello
</h1>
<p>
来了就说二句吧~~~
</p>
</div>
<?php if(is_array($msgs)&&count($msgs)>0):?>
<table class="table">
<thead>
<tr>
<th>
编号
</th>
<th>
用户
</th>
<th>
标题
</th>
<th>
时间
</th>
<th>
内容
</th>
<th>
操作
</th>
</tr>
</thead>
<body>
<?php $i=1;foreach($msgs as $key=>$val):?>
<tr class="success">
<td>
<?php echo $key+1;?>
</td>
<td>
<?php echo $val['username'];?>
</td>
<td>
<?php echo $val['title'];?>
</td>
<td>
<?php echo date("m/d/Y H:i:s",$val['time']);?>
</td>
<td>
<?php echo $val['content'];?>
</td>
<td>
<a href="edit.php?editkey=<?php echo $key?>">编辑</a>|
<a href="delete.php?delkey=<?php echo $key?>">删除</a>
</td>
</tr>
<?php endforeach;?>
</body>
</table>
<?php endif;?>
<input type="submit" class="btn btn-primary btn-lg" value="我要留言" onclick="window.location.href='add.php'"/>
<hr/>
</div>
</div>
</div>
</body>
</html>这是删除的代码
<?php
header('content-type:text/html;charset=utf-8');
date_default_timezone_set('PRC');
$filename='msg.txt';
$msgs=array();
if(isset($_GET['delkey'])&&!empty($_GET['delkey'])){
$delkey=$_GET['delkey'];
}
if(file_exists($filename)) {
$string = file_get_contents($filename);//获取文本内容
if (strlen($string) > 0) {
$msgs = unserialize($string);//反序列化赋值
}
}
else{
echo '文件不存在';
}
if(!isset($msgs[$delkey])){
echo "<script>alert('数据出错,请重试！');location.href='index.php';</script>";
}
unset($msgs[$delkey]);//销毁指定的变量
$msgs=serialize($msgs);
if(file_put_contents($filename,$msgs)){//将一个字符串写入文件
echo "<script>alert('删除成功！');location.href='index.php';</script>";
}else{
echo "<script>alert('删除失败,请重试！');location.href='index.php';</script>";
}
?107
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4回答
你好，老师删除时没有尝试删除第一条操作，没有发现错误抱歉，正确的代码如下：
首页修改部分为：
<?php $i=1;foreach($msgs as $key=>$val):?>
<tr class="success">
<td>
<?php echo $key++;?>//修改留言id值的显示
</td>
<td>
<?php echo $val['username'];?>
</td>
<td>
<?php echo $val['title'];?>
</td>
<td>
<?php echo date("m/d/Y H:i:s",$val['time']);?>
</td>
<td>
<?php echo $val['content'];?>
</td>
<td>
<a href="edit.php?editkey=<?php echo $key?>">编辑</a>|
<a href="delete.php?delkey=<?php echo $key?>">删除</a>
</td>
</tr>
<?php endforeach;?>删除页面修改部分为：
if(isset($_GET['delkey'])&&!empty($_GET['delkey'])){
$delkey=$_GET['delkey']-1;//根据id值减一
}如果解决了您的问题请采纳，祝学习愉快！
发呆发呆
2017-08-22 17:26:31
添加留言的代码
<?php
header('content-type:text/html;charset=utf-8');
date_default_timezone_set('PRC');
?>
<!DOCTYPE html>
<html>
<head>
<script type="text/javascript" src="http://www.francescomalagrino.com/BootstrapPageGenerator/3/js/jquery-2.0.0.min.js"></script>
<script type="text/javascript" src="http://www.francescomalagrino.com/BootstrapPageGenerator/3/js/jquery-ui"></script>
<link href="http://www.francescomalagrino.com/BootstrapPageGenerator/3/css/bootstrap-combined.min.css" rel="stylesheet" media="screen">
<script type="text/javascript" src="http://www.francescomalagrino.com/BootstrapPageGenerator/3/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container-fluid">
<div class="row-fluid">
<div class="span12">
<div class="page-header">
<h1>
留言板-<small>V1.0</small>
</h1>
</div>
<div class="hero-unit">
<h1>
Hello
</h1>
<p>
来了就说二句吧~~~
</p>
</div>
<div style="width: 100%;text-align:center">
<form class="form-horizontal center-block" action="index.php" method="post">
<fieldset>
<legend>请留言</legend>
<label>用户名</label><input style="" type="text" name="username" required/>
<label>标题</label><input style="" type="text" name="title" required/>
<label>内容</label><textarea name="content" rows="10" cols="30"></textarea>
<hr/>
<input type="submit" class="btn btn-primary btn-lg" name="pubMsg" value="发布留言" />
<input type="submit" class="btn btn-default btn-lg" value="查看留言" onclick="window.location.href='index.php'"/>
</fieldset>
</form>
</div>
</div>
</div>
</div>
</body>
</html>
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