Question

I have a table that store the relational between two other table that look like this

id_post | id_formation
______________________
 1      |    1
 1      |    3
 3      |    2
 3      |    4

I want to select and store this result to array of array:

example (in this case):

array(
      1=>array(1,3),
      3=>array(2,4)
     )

Could anyone tell me the SQL statement to do this? or PHP code to format the result like above ?

Answer 1

This creates the array you want:

$result = mysql_query("SELECT id_post, id_formation FROM table");

$array = array(); //empty array to hold result
while ($row = mysql_fetch_array($result)) {
  $array[$row['id_post']][] = $row['id_formation'];
}

//print result
print_r($array);