我有一个包含基本HTML的PHP网页，其中包含表单，用户可以在其中输入一些数据。表单可以由用户直接填写，也可以通过GET方法自动填写，该方法由原始PHP网页调用的操作之一返回。
问题是，在表单自动填充后，如果在网页上调用了其他任何操作（外部php页面；这些操作中的任何一个都不导致离开网页），则表单数据将被删除，并且用户空白字段。
我希望保存表单中的数据，并在输入后始终显示。在变量通过$_SESSION方法到达后，我尝试使用GET来保存值数组，但它对我不起作用：
<?php if (isset($_GET['decrypted'])) : ?>
<?php session_start();
$_SESSION['saved'] = array();
// Add items based on item ID
$_SESSION['saved'][$decrypt_data] = array('s_id' => $_GET['s_id'],'u_id' => $_GET['u_id'],'l_id' => $_GET['l_id'],'cu_id' => $_GET['cu_id']);
?>
...
<form action="./encrypt.php">
<p>2) Select options:</p>
<input type="radio" name="mode" value="one">one<br>
<input type="radio" name="mode" value="two">two<br>
<p></p>
s ID: <br><input type="text" name="s_id" value="<?php echo $_SESSION['saved'][decrypt_data]['s_id'] ?>"><br>
u ID: <br><input type="text" name="u_id" value="<?php echo $_SESSION['saved'][decrypt_data]['u_id'] ?>"><br>
l ID: <br><input type="text" name="l_id" value="<?php echo $_SESSION['saved'][decrypt_data]['l_id'] ?>"><br>
cu ID: <br><input type="text" name="cu_id" value="<?php echo $_SESSION['saved'][decrypt_data]['cu_id'] ?>"><br>
<p></p>
<input type="submit" value="Do it!">
</form>
完整代码：
<html lang="en">
<head>
<Title>WEBPAGE</Title>
</head>
<body>
<h1>DECRYPT</h1>
<form action="webpage.php" method="post" enctype="multipart/form-data">
<p>
<label for="my_upload">1) Select a file to upload:</label>
<input id="my_upload" name="my_upload" type="file">
</p>
<input type="submit" value="Upload">
</form>
<?php if (isset($_GET['uploaded'])) : ?>
<span style="background-color:#29a329"> <font color="white">File successfully uploaded!</font></span>
<?php endif; ?>
<form action="./decrypt.php">
<p>2) Select decrypt mode:</p>
<input type="radio" name="mode" value="one">one<br>
<input type="radio" name="mode" value="two">two<br>
<p></p>
<input type="submit" value="Decrypt">
</form>
<?php if (isset($_GET['decrypted'])) : ?>
<?php session_start();
$_SESSION['saved'] = array();
// Add items based on item ID
$_SESSION['saved'][$decrypt_data] = array('s_id' => $_GET['s_id'],'cu_id' => $_GET['cu_id']);
?>
<span style="background-color:#29a329"> <font color="white">File successfully decrypted!</font></span>
<p></p>
<form method="get" action="/decrypted_downloaded/<?php echo $_GET['final_name'] ?>">
<button type="submit">Download decrypted file</button>
</form>
<?php endif; ?>
<hr>
<h1>ENCRYPT normal file</h1>
<form action="webpage.php" method="post" enctype="multipart/form-data">
<p>
<label for="my_upload2">1) Select a file to upload:</label>
<input id="my_upload2" name="my_upload2" type="file">
</p>
<input type="submit" value="Upload">
</form>
<?php if (isset($_GET['uploaded_bin'])) : ?>
<span style="background-color:#29a329"> <font color="white">File successfully uploaded!</font></span>
<?php endif; ?>
<form action="./encrypt.php">
<p>2) Select encrypt options:</p>
<input type="radio" name="mode" value="one">one<br>
<input type="radio" name="mode" value="two">two<br>
<p></p>
s ID: <br><input type="text" name="s_id" value="<?php echo $_SESSION['saved'][decrypt_data]['s_id'] ?>"><br>
u ID: <br><input type="text" name="u_id" value="<?php echo $_SESSION['saved'][decrypt_data]['u_id'] ?>"><br>
l ID: <br><input type="text" name="l_id" value="<?php echo $_SESSION['saved'][decrypt_data]['l_id'] ?>"><br>
cu ID: <br><input type="text" name="cu_id" value="<?php echo $_SESSION['saved'][decrypt_data]['cu_id'] ?>"><br>
<p></p>
<input type="submit" value="Encrypt">
</form>
<?php if (isset($_GET['encrypted'])) : ?>
<span style="background-color:#29a329"> <font color="white">File successfully encrypted!</font></span>
<p></p>
<form method="get" action="/encrypted_downloaded/<?php echo $_GET['final_name_webpage'] ?>">
<button type="submit">Download encrypted file</button>
</form>
<?php endif; ?>
</body>
</html>
<?php
if ($_SERVER['REQUEST_METHOD'] == 'POST')
{
if (is_uploaded_file($_FILES['my_upload']['tmp_name']))
{
//delete folder contents
$files = glob('./encrypted_uploaded/*'); // get all file names
foreach($files as $file){ // iterate files
if(is_file($file))
unlink($file); // delete file
}
//Validate the file name
if(empty($_FILES['my_upload']['name']))
{
echo " File name is empty! ";
exit;
}
$upload_file_name = $_FILES['my_upload']['name'];
//Too long file name?
if(strlen ($upload_file_name)>150)
{
echo " too long file name ";
exit;
}
//set a limit to the file upload size
if ($_FILES['my_upload']['size'] > 10000000)
{
echo " too big file ";
exit;
}
//Save the file
$dest=__DIR__.'/encrypted_uploaded/'.$upload_file_name;
if (move_uploaded_file($_FILES['my_upload']['tmp_name'],$dest))
{
header('Location: webpage.php?uploaded=yes');
}
}
if (is_uploaded_file($_FILES['my_upload2']['tmp_name']))
{
echo " test ";
//delete folder contents
$files = glob('./decrypted_uploaded/*'); // get all file names
foreach($files as $file){ // iterate files
if(is_file($file))
unlink($file); // delete file
}
//Validate the file name
if(empty($_FILES['my_upload2']['name']))
{
echo " File name is empty! ";
exit;
}
$upload_file_name = $_FILES['my_upload2']['name'];
//Too long file name?
if(strlen ($upload_file_name)>150)
{
echo " too long file name ";
exit;
}
//set a limit to the file upload size
if ($_FILES['my_upload2']['size'] > 10000000)
{
echo " too big file ";
exit;
}
//Save the file
$dest=__DIR__.'/decrypted_uploaded/'.$upload_file_name;
if (move_uploaded_file($_FILES['my_upload2']['tmp_name'],$dest))
{
header('Location: webpage.php?uploaded_bin=yes');
}
}
}