How to add indexed arrays to an array on a certain index using PHP?

Question

I'm trying to add indexed arrays to a final array on a certain index. So far, I have tried this:

$lista = array();
$id = '1234';

$lista2 = array(
    'chave1' => 'valor1',
    'chave2' => 'valor2',
    'chave3' => 'valor3'
);

$lista3 = array(
    'chave4' => 'valor4',
    'chave5' => 'valor5',
    'chave6' => 'valor6'
);

array_push($lista[$id], $lista2);
array_push($lista[$id], $lista3);

But it's not working. The final array on the $id index has NULL value. What am I missing? Can someone help me?

Danielius · Accepted Answer · 2020-06-13 10:40:10Z

1

array_push is used for appending something to the end of array, it should not be used with specific key. You want something more like this:

<?php
$lista = array();
$id = '1234';

$lista2 = array(
    'chave1' => 'valor1',
    'chave2' => 'valor2',
    'chave3' => 'valor3'
);

$lista3 = array(
    'chave4' => 'valor4',
    'chave5' => 'valor5',
    'chave6' => 'valor6'
);

$lista[$id] = $lista2 + $lista3;

print_r($lista);

output:

Array
(
    [1234] => Array
        (
            [chave1] => valor1
            [chave2] => valor2
            [chave3] => valor3
            [chave4] => valor4
            [chave5] => valor5
            [chave6] => valor6
        )

)

EDIT:

If you need it in loop (which does not look correct, so you should reconsider structure of your code...):

<?php
$lista = array();
$id = '1234';

$lista1 = array(
    'chave7' => 'valor7',
    'chave8' => 'valor8',
    'chave9' => 'valor9'
);

$lista2 = array(
    'chave1' => 'valor1',
    'chave2' => 'valor2',
    'chave3' => 'valor3'
);

$lista3 = array(
    'chave4' => 'valor4',
    'chave5' => 'valor5',
    'chave6' => 'valor6'
);
$lista[$id] = [];
for ($i = 1; $i <= 3; $i++) {
    $lista[$id] += ${'lista' . $i};
}
print_r($lista);

edited Jun 13, 2020 at 10:40

answered Jun 12, 2020 at 20:22

Danielius

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4 Comments

churros Over a year ago

Oh I see.. But what if I'm inside a loop? Instead of 2 arrays, I need to add 35 arrays like that?

Danielius Over a year ago

Loop of arrays sounds like a bad design and you potentially need to reconsider your code. However, there is a way to do this: $lista[$id] += ${'lista' . $i}; where $i is iterative variable in your for loop, if your arrays are indexed... But as I said this is a bad pattern

churros Over a year ago

I tested your coude here, It's funny cause it's adding only $lista1 and $lista3 to the main array.

Danielius Over a year ago

@churros It is adding all of those, just that I wrote same key names for array 1 and 2. My bad. See update

piet · Accepted Answer · 2020-06-12 20:22:10Z

0

Try assigning the value directly: $lista[$id] = $lista2;

answered Jun 12, 2020 at 20:22

piet

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1 Comment

churros Over a year ago

I need to add more than one array.

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