CODEWITHSUNDEEP
phparrays
Ted Hoowkings
Ted Hoowkings

Reputation: 5

array_merge with indexes

<?php 

$one = array(11 => 'a', 12 => 'b', 13 => 'c');
$two = array(14 => 'd', 15 => 'e');

print_r(array_merge($one, $two));

this return me:

Array
(
    [0] => a
    [1] => b
    [2] => c
    [3] => d
    [4] => e
)

i would like receive:

Array
(
    [11] => a
    [12] => b
    [13] => c
    [14] => d
    [15] => e
)

How can i merge two array with indexes? Is this possible? If yes, how?

Upvotes: 0

Views: 1210

Answers (3)

Abhishek Saha
Abhishek Saha

Reputation: 2564

This is a possible solution.

$one = array(11 => 'a', 12 => 'b', 13 => 'c');
$two = array(14 => 'd', 15 => 'e');

function array_merge_values()
{
  $args = func_get_args();

  $result = $args[0];
  for ($_ = 1; $_ < count($args); $_++)
    foreach ($args[$_] as $key => $value)
    {
      if (array_key_exists($key,$result))
        $result[$key] += $value;
      else
        $result[$key] = $value;
    }
  return $result;
}

var_dump(array_merge_values($one,$two));

Output

array (size=5)
  11 => string 'a' (length=1)
  12 => string 'b' (length=1)
  13 => string 'c' (length=1)
  14 => string 'd' (length=1)
  15 => string 'e' (length=1)

Using print_r

Array
(
 [11] => a
 [12] => b
 [13] => c
 [14] => d
 [15] => e
)

Upvotes: -2

Alberto Arena
Alberto Arena

Reputation: 343

Have you tried?

$three = $one + $two;

This should preserve the keys

Upvotes: 3

user229044
user229044

Reputation: 239521

Arrays with numeric keys will have their keys discarded by array_merge. Instead, use the + operator instead of array_merge:

print_r $one + $two;

This produces:

Array
(
    [11] => a
    [12] => b
    [13] => c
    [14] => d
    [15] => e
)

Alternatively, use string keys instead of numeric keys.

Upvotes: 6

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