我正在搜索栏中的键，然后在session_start();中搜索其会话存储，现在我想在单击任何其他页面或链接或刷新此搜索会话未离开的任何页面时，然后如何使用在我的代码中销毁搜索键会话以及我应该将未设置的($_SESSION['search']);代码放在我的页面中的什么位置以销毁会话 这里是页面代码
<?php unset($_SESSION['search']);
require_once('inc/top.php');?>
<body>
<div id="wrapper">
<?php require_once('inc/header.php');?>
<?php
$total_num_page=1;
if(isset($_GET['page']))
{
$page_id=$_GET['page'];
}
else
{
$page_id=1;
}
if(isset($_POST['submitSearch']) || $_SESSION['search'])
{
session_start();
if($_POST['submitSearch']){
$_SESSION['search']=$_POST['search'];
}
$all_post_query= "select * from files where recieved_by like '%". $_SESSION["search"]. "%' or processed_by like '%".$_SESSION["search"]."%' or purpose like '%".$_SESSION["search"]."%' or file_name like '%".$_SESSION["search"]."%' order by date desc";
$all_post_run=mysqli_query($con,$all_post_query);
$all_post=mysqli_num_rows( $all_post_run);
$total_page=ceil($all_post/$total_num_page);
$page_start_from=($page_id-1)*$total_num_page;
}
else
{
$all_post_query="select * from files order by date desc";
$all_post_run=mysqli_query($con,$all_post_query);
$all_post=mysqli_num_rows($all_post_run);
$total_page=ceil($all_post/$total_num_page);
$page_start_from=($page_id-1)*$total_num_page;
}
?>
<div class="container-fluid body-section " style="margin-top:90px;margin-bottom:300px;">
<div class="row">
<div class="col-xs-12 col-sm-12 col-md-12">
<h1><i class="fa fa-hand-o-down" aria-hidden="true"> File List </i></h1>
<a href="letterfile.php"><button type="button" style=" margin-left:190px; margin-top:-70px;" class="btn btn-primary"><i class="fa fa-envelope-o" aria-hidden="true"> Case for Letter </i></button>
</a>
<a href="callfile.php"><button type="button" class="btn btn-default" style=" margin-left:210px; margin-top:-70px; background:#880E4F; "><i class="fa fa-phone-square"aria-hidden="true" style="color:white;"><font color="white"> Case for Call</font> </i></button>
</a>
<a href="dustbinfile.php"><button type="button" class="btn btn-danger" style=" margin-left:150px; margin-top:-70px;"><i class="fa fa-book" aria-hidden="true"> Filed Case</i></button>
</a>
<div class="col-md-4 col-md-offset-7 search-box">
<form action="index.php" class="search-form" method="post">
<div class="form-group has-feedbacck">
<label for="search" class="sr-only">Search:</label>
<input type="text" class="form-control" name="search" id="search" placeholder="Search Here" />
<input type="submit" class="Goform" name="submitSearch" value="Go!"/>
<span class="glyphicon glyphicon-search form-control-feedback"></span>
</div>
</form>
</div>
<hr>
<table class="table table-hover table-striped">
<thead>
<tr>
<th>Id</th>
<th>File-name</th>
<th>Purpose</th>
<th>Recieved-By </th>
<th>Processed-By</th>
<th>Adress</th>
<th>Contact-No</th>
<th>Date</th>
<th>Update</th>
</tr>
</thead>
<tbody>
<?php
if(isset($_POST['submitSearch']))
{
$search=$_POST['search'];
$p_query="select * from files where recieved_by like '%$search%' or processed_by like '%$search%' or purpose like '%$search%' or file_name like '%$search%' order by date desc limit $page_start_from, $total_num_page";
}
else
{
$p_query="select * from files order by date desc limit $page_start_from, $total_num_page";
}
$p_run=mysqli_query($con,$p_query);
if(mysqli_num_rows($p_run)){
while($row=mysqli_fetch_array($p_run))
{
$c_id=$row['id'];
$file=$row['file_name'];
$purpose=$row['purpose'];
$recieve=$row['recieved_by'];
$processed=$row['processed_by'];
$address=$row['address'];
$contact=$row['contact_no'];
$date=$row['date'];
?>
这是用于发送的分页代码
<ul class="pagination">
<?php
for($i=1;$i<=$total_page;$i++)
echo "<li class='".($page_id == $i? 'active' : '')."'><a href='index.php?page=".$i."'>$i</a></li>";
?>
</ul>
那么我应该在哪里写代码来取消设置会话，请帮帮我，我是php的新手，我知道这段代码容易受到SQL注入的影响
使用之后你想要摧毁你的会话
未设置($SESSION["键"](