How to display decrypted AES in php form

[anhtu]

I have a form that I use php to retrieve data from MySQL and display that data in an input box. One of the fields is encrypted when the data is submitted into MySQL using AES_ENCRYPTED and that part works fine, I can see in the DB that that data is encrypted.
My issue is how to use AES_DECRYPT to display the decrypted data in my input box with my php code. For example my form has a field like this <input type="text" name="data" value="<?php echo $data2['data']?>"/> <--- This field being the encrypted data that I need to decrypted and display as it's original info.
I know that I can enter this at a MySQL command line SELECT aes_decrypt(dat a, '123456790abcde fghijklmnopqrst uvwxyz') FROM applications WHERE ID = '52' and it will display the data for record 52 decrypted I just don't know how to implement it in my php form.
I've tried this:
$data = "SELECT * FROM $tbl_name WHERE ID = $id";
$query = mysqli_query($c onn, $data);
$data2 = mysqli_fetch_ar ray($query);
and obviously it doesn't decrypt but it does show the encrypted data in the form.
I tried different variations of SELECT AES_DECRYPT('da ta', '$aeskey') FROM $tbl_name WHERE ID = $id"; and so on with no success.
I've tried to change the input value to value="<?php echo $data2[AES_DECRYPT('da ta', '$aeskey')]?>"/> and I get an empty input box.

Can someone help me get this solved PLEASE?

[Luuk]

My experience with PHP is limited, but this example shows a working INSERT and SELECT

<?php
$server = "localhost";
$user = "root";
$pass = "secret";
$db = "test";
$mysqli = mysqli_connect($server, $user, $pass, $db);

$aeskey = "12345abcde";
$testvalue = "sometestvalue";

$stmt =  $mysqli->stmt_init();
$stmt->prepare("drop table if exists aes");
$stmt->execute();
$stmt->fetch();
$stmt->close();

$stmt =  $mysqli->stmt_init();
$stmt->prepare("create table aes(value blob)");
$stmt->execute();
$stmt->fetch();
$stmt->close();
echo "Table 'aes' created\n";

$stmt =  $mysqli->stmt_init();
if ($stmt->prepare("INSERT INTO aes VALUES(AES_ENCRYPT(?,?))")) {
    $stmt->bind_param("ss", $testvalue, $aeskey);
    $stmt->execute();
    $stmt->close();
}
echo "Record inserted\n";

$stmt =  $mysqli->stmt_init();
if ($stmt->prepare("SELECT AES_DECRYPT(value, ?) FROM aes")) {
    $stmt->bind_param("s", $aeskey);
    $stmt->execute();
    $stmt->bind_result($value);
    $stmt->fetch();
    $stmt->close();
}
echo "Your testvalue is: $value\n";

$mysqli->close();

The output is:
Table 'aes' created
Record inserted
Your testvalue is: sometestvalue