Merging two arrays without changing key values php

Question

I have two arrays in php as shown in the code

<?php
$a=array('0'=>array('500'=>'1','502'=>'2'));
$b=array('0'=>array('503'=>'3','504'=>'5'));
print_r(array_merge($a[0],$b[0]));
?>

I need to merge two arrays. array_merge function successfully merged two of them but key value gets changed. I need the following output

  Array
    (
        [0]=>Array(
           [500] => 1
           [502] => 2
           [503] => 3
           [504] => 5
         )
    )

What function can I use in php so that the following output is obtained without changing key values?

@Vatev Thanks for your solution $c[0]=$a[0]+$b[0]; gives the expected array $c. First time, I have been seeing usage of '+' operator in Arrays. — Ganesh Babu, Sep 09 '13 at 08:27

score 21 · Accepted Answer · answered Sep 09 '13 at 08:19

From the documentation, Example #3:

If you want to append array elements from the second array to the first array while not overwriting the elements from the first array and not re-indexing, use the + array union operator:
<?php
$array1 = array(0 => 'zero_a', 2 => 'two_a', 3 => 'three_a');
$array2 = array(1 => 'one_b', 3 => 'three_b', 4 => 'four_b');
$result = $array1 + $array2;
var_dump($result);
?>
The keys from the first array will be preserved. If an array key exists in both arrays, then the element from the first array will be used and the matching key's element from the second array will be ignored.
array(5) {
  [0]=>
  string(6) "zero_a"
  [2]=>
  string(5) "two_a"
  [3]=>
  string(7) "three_a"
  [1]=>
  string(5) "one_b"
  [4]=>
  string(6) "four_b"
}

Therefore, try: $a[0] + $b[0]

funny thing is **array_merge** on my DEV environment (XAMPP PHP 5.6.24) vs TEST environment (PHP 5.5.9-1ubuntu4.20) produces different outputs, while DEV produces same result as the **+** sign and TEST produces **array_merge** as stated in the documentation. Thank you. — ochitos, Jan 26 '17 at 09:24

score 5 · Answer 2 · edited May 23 '17 at 12:09

5

$a=array('0'=>array('500'=>'1','502'=>'2'));
$b=array('0'=>array('503'=>'3','504'=>'5'));

$c = $a + $b; //$c will be a merged array

see the answer for this question

edited May 23 '17 at 12:09

Community

1
1

answered Sep 09 '13 at 08:22

Bere

1,627
2
16
22

score 0 · Answer 3 · answered Sep 09 '13 at 08:20

Try:

$final  = array();
$a=array('0'=>array('500'=>'1','502'=>'2'));
$b=array('0'=>array('503'=>'3','504'=>'5'));
foreach( $a as $key=>$each ){
    $final[$key]    = $each;
}
foreach( $b as $key=>$each ){
    $final[$key]    = $each;
}

print_r( $final );

score 0 · Answer 4 · answered Sep 09 '13 at 08:21

0

$a=array('0'=>array('500'=>'1','502'=>'2'));
        $b=array('0'=>array('503'=>'3','504'=>'5'));
        $c = $a[0] + $b[0];
        print_r($c);

Will print:

Array ( [500] => 1 [502] => 2 [503] => 3 [504] => 5 )

answered Sep 09 '13 at 08:21

briosheje

7,356
2
32
54

score 0 · Answer 5 · answered Aug 30 '16 at 10:26

Just write :  
   <?php
    $a = array(2=>'green', 4=>'red', 7=>'yellow',3=>'Green');
    $b = array(8=>'avocado');
    $d = $a+$b;

    echo'<pre>'; print_r($d);

    ?>

out put :

Array
(
    [2] => green
    [4] => red
    [7] => yellow
    [3] => Green
    [8] => avocado
)

Merging two arrays without changing key values php

5 Answers5