Add array at the end of another array in a foreach

Question

$celulas = array (

  0 => array ("idCelula" => 17,"nomeCelula" => "Célula 1" ),
  1 => array ("idCelula" => 18,"nomeCelula" => "Célula 2" )

);

foreach ( $celulas as $celula ) {

        $celulasPesquisa = null;

        $celulasReunioes = array (

          0 => array ("idCelula" => 17,"diaReuniao" => 5)

        );
        array_push ( $celula, $celulasReunioes );
}

print_r($celulas);

Man goal is that for each $celula of array $celulas be it added one array $celulasReunioes who brings the meetings that cell.

Namely that the array final $celulas stay that way:

$celulas = array (

  0 => array (
               "idCelula" => 17,
                "nomeCelula" => "Célula 1", 
                array ( 0 => array ("idCelula" => 17,"diaReuniao" => 5)

  1 => array (
               "idCelula" => 18,
                "nomeCelula" => "Célula 2", 
                array ( 0 => array ("idCelula" => 18,"diaReuniao" => 12)

);

What needs to be done?

'Cause the way I’m doing it’s not working!

Detail, I tried to create a minimal example according to orientation.

The way it is,

print_ ( $celulas );

prints:

$celulas = array (

  0 => array ("idCelula" => 17,"nomeCelula" => "Célula 1" ),
  1 => array ("idCelula" => 18,"nomeCelula" => "Célula 2" )

);

That is, without the addition of foreach

Answer 1

If you need to change the element of array, needs to maintain the reference of the same. Remember that the foreach naturally iterates over a copy of array.

So you need to put the character & indicating the reference:

foreach ($celulas as &$celula) {

}

Doing this will get the desired result:

Array
(
    [0] => Array
        (
            [idCelula] => 17
            [nomeCelula] => Célula 1
            [0] => Array
                (
                    [0] => Array
                        (
                            [idCelula] => 17
                            [diaReuniao] => 5
                        )

                )

        )

    [1] => Array
        (
            [idCelula] => 18
            [nomeCelula] => Célula 2
            [0] => Array
                (
                    [0] => Array
                        (
                            [idCelula] => 17
                            [diaReuniao] => 5
                        )

                )

        )

)

But I feel obliged to comment that it doesn’t make much sense to have a array associative with numeric indexes. It would make much more sense in this case the data is in the index "reunioes" or something equivalent.

Answer 2

I put the &$celula so that it actually changes the array by passing it by reference and prints the result below, which is what you want:

<?php

$celulas = array(
    0 => array("idCelula" => 17, "nomeCelula" => "Célula 1"),
    1 => array("idCelula" => 18, "nomeCelula" => "Célula 2")
);

$org_celula = array();

$org_celula[] = [
    'idCelula' => 17,
    'diaReuniao' => 5
];

$org_celula[] = [
    'idCelula' => 18,
    'diaReuniao' => 12
];

foreach ($celulas as $index => &$celula) {
    foreach ($org_celula as $key => $cell) {

        if ($key === $index) {
            $celula['celula'] = $cell;
        }
    }
}

print_r($celulas);