我的问题是我的 html/php 表单在发布时没有“刷新”。我一直在通过“元刷新”来解决这个问题，但最近在我想要回显某些内容时遇到了一个问题，并且由于“元刷新”而从未出现过，我尝试了一些没有运气的事情，在这里是代码。
<?php //SESSION START
session_start();
if ($_SESSION['username']){
//grant access
}else{
header('Location: login.html');
}
if(session_is_registered(username)){
$username = $_SESSION['username'];
if ($username!==Administrator){
//grant access
}else{
header('Location: index.php');
}
}
?>
<html>
<head>
<meta charset=UTF-8 />
<link rel="stylesheet" type="text/css" href="css/main_style.css" />
<title>XYZ Car Rental - Rent a Car</title>
<link rel="icon" href="favicon.ico" />
</head>
<body>
<div id="container">
<div id="header">
<span style="color:#38C0CC;">XYZ</span> Car Rental
</div>
<div id="banner"><?php echo "Welcome ".$_SESSION['username'].". "?></div>
<!--Greets user with "Welcome 'username'"-->
<div id="navbar">
<?php //navigation bar privaledges
if(session_is_registered(username)){//if logged in
$username = $_SESSION['username'];//creates variable: username
if ($username==Administrator){//if the username is equal to 'Administrator' show the following navigation
?>
<a href="index.php"><div class="button"><img src="images/home.jpg" /></div></a>
<a href="add_car.php"><div class="button"><img src="images/insert_car.jpg" /></div></a>
<a href="remove_car.php"><div class="button"><img src="images/remove_car.jpg" /></div></a>
<a href="update_car.php"><div class="button"><img src="images/update_car.jpg" /></div></a>
<a href="view_car.php"><div class="button"><img src="images/view_cars.jpg" /></div></a>
<div class="seperator"></div>
<a href="add_user.php"><div class="button"><img src="images/add_user.jpg" /></div></a>
<a href="remove_user.php"><div class="button"><img src="images/remove_user.jpg" /></div></a>
<a href="update_user.php"><div class="button"><img src="images/update_user.jpg" /></div></a>
<a href="view_user.php"><div class="button"><img src="images/view_users.jpg" /></div></a>
<div class="seperator"></div>
<a href="logout.php"><div class="button"><img src="images/logout.jpg" /></div></a>
<?php }else{ //else, show the navigation bar for a user ?>
<a href="index.php"><div class="button"><img src="images/home.jpg" /></div></a>
<a href="rent_car.php"><div class="button"><img src="images/rent_car_s.jpg" /></div></a>
<a href="return_car.php"><div class="button"><img src="images/return_car.jpg" /></div></a>
<a href="view_car.php"><div class="button"><img src="images/view_cars.jpg" /></div></a>
<div class="seperator"></div>
<a href="logout.php"><div class="button"><img src="images/logout.jpg" /></div></a>
<?php
}
}
//close if's
?>
</div>
<div id="content">
<span style="font-size:28px;">Rent Cars</span>
<hr />
<?php
$link = mysql_connect ("localhost", "root", "password");//connect to database
mysql_select_db ("cardatabase");//select database
$query = "SELECT * from cars";//select all from table, cars
$result = mysql_query ($query, $link);//result = query
$available = $_POST[available];
//$available = the posted available
if (isset($_POST['submit'])){//if submit is pressed, execute
if($available>0){//if there is a car avaialble of that type
//add one of those cars to the table, rentedcars
//include the name of the users session for extra purposes
mysql_query("INSERT INTO rentedcars(REAL_ID,ID,CARMAKE,CARMODEL,FUELTYPE,TRANSMISSION,ENGINESIZE,DOORS,DATEADDED,USERNAME) SELECT '',id,carmake,carmodel,fueltype,transmission,enginesize,doors,dateadded,'$username' FROM cars WHERE id='$_POST[hidden]'");
//after it has been added, run another query to reduce the 'available' by 1
//available = available - 1
mysql_query ("UPDATE cars SET available=available-1 WHERE id='$_POST[hidden]'");
//echo "<meta http-equiv='refresh' content='0;url=rent_car.php'/>";
//refresh the page after it is complete
$success = "Car Rented.";
}else{//if the 'available' == 0
$error = "There is no more cars of that type available.";
//creates a variable, to be printed in a different div
//all of that type are no longer available
//stops renting cars below 0
}
}
//echos the table & titles
echo "<table cellspacing=3 border=1 style='font-size:13px;background-color:white;'>
<tr style='background-color:#38C0CC;'>
<td>ID</td>
<td>Make</td>
<td>Model</td>
<td>Fuel Type</td>
<td>Transmission</td>
<td>Engine Size</td>
<td>Doors</td>
<td>Amount</td>
<td>Available</td>
<td>Date Added</td>
<td></td>
<td>Rent</td>
</tr>";
//while loop to display data from the database into a form
while($row = mysql_fetch_array($result))
{
echo "<form action=rent_car.php method=post>";
echo "<tr>";
echo "<td>"."<input type=text name=id value=".$row['ID'].">"." </td>";//value = database value
echo "<td>"."<input type=text name=carmake value=".$row['CARMAKE'].">"." </td>";//value = database value
echo "<td>"."<input type=text name=carmodel value=".$row['CARMODEL'].">"." </td>";//value = database value
echo "<td>"."<input type=text name=fueltype value=".$row['FUELTYPE'].">"." </td>";//value = database value
echo "<td>"."<input type=text name=transmission value=".$row['TRANSMISSION'].">" . " </td>";//value = database value
echo "<td>"."<input type=text name=enginesize value=".$row['ENGINESIZE'].">" . " </td>";//value = database value
echo "<td>"."<input type=text name=doors value=".$row['DOORS'].">"." </td>";//value = database value
echo "<td>"."<input type=text name=amount value=".$row['AMOUNT'].">"." </td>";//value = database value
echo "<td>"."<input type=text name=available value=".$row['AVAILABLE'].">"." </td>";//value = database value
echo "<td>"."<input type=text name=dateadded value=".$row['DATEADDED'].">"." </td>";//value = database value
echo "<td>"."<input type=hidden name=hidden value=".$row['ID'].">"." </td>";//hidden value
//hidden value helps target the ID value when it is not available
echo "<td>"."<input type=submit name=submit value=Rent>"." </td>";//submit
echo "</tr>";
echo "</form>";
}
//close while loop
echo "</table>";
//close table
?>
<div id="errorbox">
<?php echo $error; ?>
<!--echos the error-->
<!--no more cars available-->
</div>
<div id="successbox">
<?php echo $success; ?>
<!--echos the success-->
<!car has been rented-->
</div>
</div>
<br style="clear:both;" />
<!--clears the float-->
<div id="footer">
XYZ Car Rental™
</div>
</div>
</body>
</html>
我知道代码有点让人头疼，任何帮助都会很棒！