How do I use AES_Decrypt - php

Question

I know this question has been asked a billion times as I've spent the last 2 weeks looking at all the previously asked questions and answers
but none of them actually have an understandable answer. So my question is this, I have a form that I'm passing the data input by users into a mysql
database and a portion of that data is encrypted with AES_Encrypt. When I check the database I can see the data has been encrypted so I'm good on the encryption part.
My issue lies in the decryption part. I've tried multiple variations from previous questions asked with no success, This is what I have so far,
//ENCRYPTING DATA
require 'path to key.php';
$sql = "INSERT INTO applications "(fname, lname, dob, ssn) VALUES ('$fname', '$lname', '$dob', AES_ENCRYPT('$ssn', '".$aeskey."')";
The code above works fine to encrypt the string.
This is where I'm confused, I'm wanting to select all the data associated with the ID for a record and decrypt the encrypted data for that record as well,
for example I have a search form that pulls up all the records in the database, you can then select to view a record and the results display in a form similar to the form used
to input the information.
So in my form to view records I have the following code.
//DECRYPT DATA
require 'path to key.php';
$conn = new mysqli($servername, $username, $password, $dbname);
$data = "SELECT * FROM $tbl_name where ID = $id";
$query = mysqli_query($conn, $data);
$data2 = mysqli_fetch_array($query);
<input type = "text" name="fname" value="<?php echo $data2['fname']?>"/>
<input type = "text" name="lname" value="<?php echo $data2['lname']?>"/>
<input type = "text" name="dob" value="<?php echo $data2['dob']?>"/>
<input type = "text" name="ssn" value="<?php echo $data2['ssn']?>"/><-----This will display the encrypted data in the encrypted form
So do I need to decrypt the encrypted data from the input box like
<input type = "text" name="ssn" value=<?php echo [AES_DECRYPT('ssn', '$aeskey')]?>"/> <---Doesn't work
or do I need to do something like this:
$sql SELECT * FROM $tbl_name (AES_DECRYPT('ssn', '$aeskey')) WHERE ID=$id;
Or am I totally wrong in how I think AES_DECRYPT should be used?

Answer 1

In the INSERT you use AES_ENCRYPT (of MySQL); then you have in your SELECT apply AES_DECRYPT; ejem:
SELECT fname, lname, dob, AES_DECRYPT(ssn, yourAESKey) as ssn
FROM applications [wHERE ... and other more that you require]
See that AES_DECRYPT have alias to return of result.
EDITED
Only change in $data the string with the SQL:
$data= "SELECT fname, lname, dob, AES_DECRYPT(ssn, yourAESKey) as ssn
FROM applications [WHERE ... and other more that you require]"
You line: <input type = "text" name="ssn" value="<?php echo $data2['ssn']?>"/><-----This will display the encrypted data in the encrypted form not change; unless instead of ssn (all in lowercase) in the alias you change some letter or all the letters to capital letters, you assign another alias name to the decrypted text; In order not to be ssn (in lower case).