Add data in a multidimensional array dynamically - php

Question

I am needing to add data dynamically into a multidimensional array. The data comes from a query in the database. I can see through the "echo" all elements, but in time to add to the multidimensional vector data and overwrite only the last record is added.
My example below:
$queryu = "SELECT * FROM usuario ORDER BY id";
$stmtu = $con->prepare($queryu);
$stmtu->execute();
$numu = $stmtu->rowCount();
$j = 0;
$lista;
if ($numu > 0) {
$colunas = 3;
while ($rowu = $stmtu->fetch(PDO :: FETCH_ASSOC)) {
extract($rowu);
$lista['id'] = $id;
$lista['nome'] = $nome;
$j++;
}
}
The result:
id - 6
nome - teste
This is the last record added.
Thanks!!!

Answer 1

You don't create a multi dimensional array by now. You just update create two key => value pairs id and nome. If you want to store multiple of them you have to create a multidimensional array which means an array inside another array:
$lista = array(); // init your array!
while ($rowu = $stmtu->fetch(PDO :: FETCH_ASSOC)) {
extract($rowu);
$lista[] = array(
'id' => $id,
'nome' => $nome
);
$j++;
}
Or do it even smarter (if the keys in the final array are the same as the column names):
$lista = array(); // init your array!
while ($rowu = $stmtu->fetch(PDO :: FETCH_ASSOC)) {
$lista[] = $rowu;
$j++;
}

Answer 2

Modify your code as follows
$queryu = "SELECT * FROM usuario ORDER BY id";
$stmtu = $con->prepare($queryu);
$stmtu->execute();
$numu = $stmtu->rowCount();
$lista = array();
if ($numu > 0) {
$colunas = 3;
while ($rowu = $stmtu->fetch(PDO :: FETCH_ASSOC)) {
extract($rowu);
$lista[] = array('id' => $id, 'nome' => $nome);
}
}
As you probably noticed here, I've removed j index (you don't need it; I suppose that you would use it as "first-level-index" of your multidimensional array) and added that statement: $lista[] =. "Magic" happens just there: with this command ($arrayname[] =) you can append to existent array a new element.
However I don't know from where you're obtaining $id and $nome so this snippet could fail due to undefined variables and similar