Populate dropdown with custom array key and value)

Hi there,
Currently trying to populate a dropdown list in my form with the result of a query that use join and calculation. the actual way i try to achieve it , is with a custom code.
The code looks this way.

<?php

	
	
	// Connect to MySQL.
	$link = new mysqli('myhost', 'user', 'password', 'db');
	if ( $link->connect_errno ) {
		die( "Failed to connect to MySQL: (" . $link->connect_errno . ") " . $link->connect_error );
	}
	// Get the datas from the database.
	$query1 = "SELECT 'here_comes_the_first_query from table 1';";
	$result = $link->query($query);
	
	
	// Extract the datas returned by the query1 and insert it in an array.
	$data = array();
	while ( $row = $result->fetch_assoc() ) {
		$data[] = $row;

    $query2 = "SELECT 'here_comes_the_second_query from table 2';";
	$result = $link->query($query);
	
	
	// Extract the datas returned by the query and insert it in an array.
	$data = array();
	while ( $row = $result->fetch_assoc() ) {
		$data2[] = $row;
	
	
	// Merge 2 array.

	$mergedresult = array_merge($data, $data2);
	print_r($mergedresult);

	$form->data['Mydropdownlist_fieldID'] = $mergedresult; //this part doesn't work




?>

So my code is Alrigth as i can see from the "print_r" function in the top of my form it returns me :

Array (
[0] => Array ( [id] => 4 [formation] => MSPI-MNE_formerge ) 
[1] => Array ( [id] => 3 [formation] => MSPI-GIPI ) 
[2] => Array ( [id] => 4 [formation] => MSPI-MNE ) 
[3] => Array ( [id] => 5 [formation] => LPRO-PPO ) 
[4] => Array ( [id] => 7 [formation] => LPRO-LIEE ) ) 

so great what i know want to to is to put thes value in my dropdown, BUT with key and value.
like:
4=MSPI-MNE_formerge
3=MSPI-GIPI
4=MSPI-MNE
5=LPRO-PPO
...... and so on.
i thougth that the embedded function

$form->data['Mydropdownlist_fieldID'] = $mergedresult

, would achieve it but nothing appears in my dropdown.
a little help would be great.
Thanks a lot.

Hi florian,

Please see teh Dynamic Data list section in this FAQ

Bob.