Merge PHP Associative Array

Question

I have multiple arrays and i'm trying to merge them. Imagine the following code;

$arr1[ 'a' ] = array( 'a', 'b', 'c' );
$arr2[ 'a' ] = array( 'd', 'e', 'f' );
$arr3[ 'a' ] = array( 'g', 'h', 'i' );

$arr1[ 'b' ] = array( 'a', 'b', 'c' );
$arr2[ 'b' ] = array( 'd', 'e', 'f' );
$arr3[ 'b' ] = array( 'g', 'h', 'i' );

$buf = array_merge( $arr1, $arr2, $arr3 );
print_r( $buf );

The result i'm expecting is;

Array
(
  [a] => Array
    (
      [ 0 ] => a
      [ 1 ] => b
      [ 2 ] => c
      [ 3 ] => d
      [ 4 ] => e
      [ 5 ] => f
      [ 6 ] => g
      [ 7 ] => h
      [ 8 ] => i
    )

  [b] => Array
    (
      [ 0 ] => a
      [ 1 ] => b
      [ 2 ] => c
      [ 3 ] => d
      [ 4 ] => e
      [ 5 ] => f
      [ 6 ] => g
      [ 7 ] => h
      [ 8 ] => i
    )
)

I tried using array_merge( ) and array_combine( ) without success. Hope any one can help.

Marin Atanasov · Accepted Answer · 2014-09-06 20:20:32Z

4

Use:

$buf = array_merge_recursive($arr1, $arr2, $arr3);

answered Sep 6, 2014 at 20:20

Marin Atanasov

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Comments

mpgn · Accepted Answer · 2014-09-06 20:17:16Z

2

Something like this :

<?php
$arr1[ 'a' ] = array( 'a', 'b', 'c' );
$arr2[ 'a' ] = array( 'd', 'e', 'f' );
$arr3[ 'a' ] = array( 'g', 'h', 'i' );

$arr1[ 'b' ] = array( 'a', 'b', 'c' );
$arr2[ 'b' ] = array( 'd', 'e', 'f' );
$arr3[ 'b' ] = array( 'g', 'h', 'i' );

$array = [
    'a' => array_merge($arr1['a'], $arr2['a'], $arr3['a']),
    'b' => array_merge($arr1['b'], $arr2['b'], $arr3['b'])
];

var_dump($array);

answered Sep 6, 2014 at 20:17

mpgn

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1 Comment

scrowler Over a year ago

I like this solution, but it won't scale at all - you'll need to keep adding levels to your $array each time a key is added, or create a loop to do it. PHP's built in functions will almost always win over custom logic.

scrowler · Accepted Answer · 2014-09-06 20:21:12Z

1

array_merge() only looks one level deep into arrays. You should use array_merge_recursive() for this:

$buf = array_merge_recursive( $arr1, $arr2, $arr3 );

answered Sep 6, 2014 at 20:21

scrowler

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Comments

Algobasket · Accepted Answer · 2014-09-06 20:39:44Z

0

$arr1[ 'a' ] = array( 'a', 'b', 'c' );

$arr2[ 'a' ] = array( 'd', 'e', 'f' );

$arr3[ 'a' ] = array( 'g', 'h', 'i' );

$arr1[ 'b' ] = array( 'a', 'b', 'c' );

$arr2[ 'b' ] = array( 'd', 'e', 'f' );

$arr3[ 'b' ] = array( 'g', 'h', 'i' );

$array = array(

'a' => array_merge($arr1['a'], $arr2['a'], $arr3['a']),
'b' => array_merge($arr1['b'], $arr2['b'], $arr3['b'])

);

print_r($array);

answered Sep 6, 2014 at 20:39

Algobasket

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1 Comment

scrowler Over a year ago

This is essentially the same answer as this one, which was posted 30 minutes ago

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