PHP/HTML: saving form data once entered

Question 1

I have a PHP webpage with basic HTML, which includes form, where user can enter some data. The form can be filled in by user directly, but can also be auto-filled via GET method, returned by one of the actions which are called from original PHP webpage.

Problem is, after the form gets auto-filled, if any other action is called on the webpage (external php pages; non of those actions actually result in leaving the webpage), the form data gets deleted and user is left with blank fields.

I would like to have data in the form saved and always displayed once entered. I tried using $_SESSION after variables arrive via GET method to save array of values, but it is not working for me:

<?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>

FULL CODE:

<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'], 'u_id' => $_GET['u_id'], 'l_id' => $_GET['l_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');
 }
 }
}

Question 2

Do you have any other forms on the page? Also, doesn't [decrypt_data] give you an error?

Question 3

Yes, there are 4 forms on the webpage, but this is the only one with text fields. No, [decrypt_data], does not give me an error.

Question 4

This might be a long shot, but do you update the other forms by these other actions? If so, how are you updating those?

Question 5

No, I am not updating other forms. I am only displaying certain messages or buttons via HTML when I get certain GET responses.

Question 6

Are any of these buttons inside the forms? How do you select the button to update? Because I do not see classes or ids in forms or form fields. Are you using name or type attributes to select? I am asking this because I am thinking this is happening because you might have forgotten to properly target the element...

Question 7

You save data in $_SESSION['saved'][$decrypt_data] But you read $_SESSION['saved'][decrypt_data]['l_id'] Add the $ sign to decrypt_data when you read data

Question 8

Thanks, that does help, data gets displayed now after GET parameters are received, but as soon as another action is called, data gets erased from text fields ... :/

Question 9

Looks like my data in "decrypt_data" is lost, maybe session is lost? I don't know why ...

Question 10

OK, your answer was correct for my specific question, the "$" was missing. I had further problems with session, which I solved by putting <?php session_start(); ?> directly after html tag. Thanks!

Question 11

You must use the Post Method in Html form; and get with the Post method;

CiroRa 5103 silver badges14 bronze badges · Accepted Answer · 2019-11-17 13:45:14Z

1

You save data in $_SESSION['saved'][$decrypt_data] But you read $_SESSION['saved'][decrypt_data]['l_id'] Add the $ sign to decrypt_data when you read data

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answered Nov 17, 2019 at 13:45

CiroRa's user avatar

CiroRa

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3 Comments

jurij

jurij Over a year ago

Thanks, that does help, data gets displayed now after GET parameters are received, but as soon as another action is called, data gets erased from text fields ... :/

2019年11月17日T20:13:46.423Z+00:00

jurij

jurij Over a year ago

Looks like my data in "decrypt_data" is lost, maybe session is lost? I don't know why ...

2019年11月17日T23:06:33.757Z+00:00

jurij

jurij Over a year ago

OK, your answer was correct for my specific question, the "$" was missing. I had further problems with session, which I solved by putting <?php session_start(); ?> directly after html tag. Thanks!

2019年11月17日T23:35:06.76Z+00:00

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