Member Avatar for masterjiraya 
<?php
$array['key1']['key2']=array();
array_push($array,$array['key1']=>'one',$array['key2']=>'two')
print_r($array['key1']['key2']);
?>

can someone tell me if this is possible for multidimensional arrays?
revise the code if I am wrong

actually I am creating a site for billboards reservation

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  • Latest Post Latest Post by Member #120589

Dani AI

Generated

When working with multidimensional arrays in PHP, array_push() can only append values to an existing array; it does not assign key/value pairs. For associative structures (e.g., by billboard ID), create or ensure the subarray exists, then push each reservation onto that subarray. This avoids "Undefined array key/offset" notices in newer PHP versions.

Example for a billboard reservation use case:

$reservations = [];

function addReservation(array &$store, string $boardId, array $booking): void {
    $store[$boardId] = $store[$boardId] ?? [];        // or: $store[$boardId] ??= [];
    array_push($store[$boardId], $booking);           // append one booking to that board
}

addReservation($reservations, 'BB-17', ['date' => '2025-08-01', 'client' => 'Acme']);
addReservation($reservations, 'BB-17', ['date' => '2025-08-15', 'client' => 'Beta Co']);

// $reservations['BB-17'] is now an array of bookings; index into it or loop to read items.

Notes:

  • array_push($arr, $value) appends values using numeric indexes; you cannot push 'key' => 'value' pairs. Use direct assignment if you need to set a specific associative key.
  • Initialize the nested array before pushing (via ??/??= or isset) to avoid runtime notices.
  • For single appends, using the append operator is typically faster than array_push; however, array_push is fine when you want to append multiple items at once.

References:

Recommended Answers

All 10 Replies

Member Avatar for blocblue

It really isn't clear from the code you've posted what your starting array structure or desired finished array structure should be.

At a guess, you can do the following:

$array = array();
$array['key1'] = 'one';
$array['key2'] = 'two';

print_r($array);
/*
array(
    'key1' => 'one',
    'key2' => 'two',
)
*/

If that's incorrect, what exactly are you trying to achieve?

Member Avatar for masterjiraya

THe reason of this is I wanna try to add elements in a 2 dimensional array by assigning a key index then use array_push()

Member Avatar for blocblue

Array push can add a value (of any type) to an existing array.

array_push($array, $new_array);

If you want to assign values to a specific array index, you need to do it explicitly.
$array['my_index'] = $new_array;
Or
$array['my_index'][] = $new_array;

Member Avatar for masterjiraya

mr blocblue

does the blank square brackets is the container of the $new_array or not

Member Avatar for blocblue

Try just using:
$array['my_index'] = $new_array;

Member Avatar for jstfsklh211

two ways of adding values to an array
by specific index (string|int)

$array = array();
$array['key1'] = $val1;
$array['key2'] = $val2;
print_r($array);
/*
array(
    "key1"=>$val1,
    "key2"=>$val2
)
echo array["key1"] // prints $val1
*/

adding values by "push" uses next available int

$array = array();
$array[] = $val1;
$array[] = $val2;
print_r($array);
/*
array(
    0=>val1,
    1=>val2
)
echo array[0] // prints $val1
*/

multidimensional array

$array = array();
$array[0][] = $val1;
$array[0][] = $val2;
$array[] = array($val3, $val4);
print_r($array);
/*
array(
    0=>array(
        0=>$val1
        1=>$val2
    ),
    1=>array(
        0=>$val3
        1=>$val4
    )
)
echo array[0] // prints $val1
*/
Edited by jstfsklh211
Member Avatar for Cecep_1

$array = array();
$array[0][] = $val1;
$array[0][] = $val2;
$array[] = array($val3, $val4);
print_r($array);

echo array[0] // prints $val1

Member Avatar for Daniel_48 
<?php 
        $testing = array();

        for ($i=1; $i < 11 ; $i++) { 
            array_push($testing[$i] = $i);

            }
    ?> <pre><?php print_r($testing); ?></pre>
Member Avatar for Member #120589

This thread has become totally unravelled. The precise intent (what type of keys) has not been made clear. Please can we stop posting here as it's becoming a dump for who-knows-what. Thanks.

Edited by Member #120589
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