Asked  2 Years ago    Answers:  5   Viewed   79 times

When I use array_merge() with associative arrays I get what I want, but when I use them with numerical key arrays the keys get changed.

With + the keys are preserved but it doesn't work with associative arrays.

I don't understand how this works, can anybody explain it to me?

 Answers

3

Because both arrays are numerically-indexed, only the values in the first array will be used.

The + operator returns the right-hand array appended to the left-hand array; for keys that exist in both arrays, the elements from the left-hand array will be used, and the matching elements from the right-hand array will be ignored.

http://php.net/manual/en/language.operators.array.php

array_merge() has slightly different behavior:

If the input arrays have the same string keys, then the later value for that key will overwrite the previous one. If, however, the arrays contain numeric keys, the later value will not overwrite the original value, but will be appended. Values in the input array with numeric keys will be renumbered with incrementing keys starting from zero in the result array.

http://php.net/manual/en/function.array-merge.php

Tuesday, October 11, 2022
1
$output = array();

$arrayAB = array_merge($arrayA, $arrayB);
foreach ( $arrayAB as $value ) {
  $id = $value['id'];
  if ( !isset($output[$id]) ) {
    $output[$id] = array();
  }
  $output[$id] = array_merge($output[$id], $value);
}

var_dump($output);

Optionally if you want to reset output's keys, just do:

$output = array_values($output);
Tuesday, November 22, 2022
 
3

Use array_merge_recursive :

Convert all numeric key to strings, (make is associative array)

$result = array_merge_recursive($ar1, $ar2);
print_r($result);

See live demo here

Wednesday, September 28, 2022
 
davidn
 
1

You can use array_replace and array_filter

$mergedArray = array_replace($b, array_filter($a));

The result would be:

array(3) {
  ["key1"]=>
  string(19) "key1 from prioritar"
  ["key2"]=>
  string(24) "key2 from LESS prioritar"
  ["my_problem"]=>
  string(18) "I REACHED MY GOAL!"
}
Sunday, October 23, 2022
 
2

Use the + operator.

Compare array_merge to + operator:

<?php

$a1 = array(0=>"whatever",);
$a2 = array(0=>"whatever",1=>"a",2=>"b");

print_r(array_merge($a1,$a2));
print_r($a1+$a2);
?>

Output:

Array
(
    [0] => whatever
    [1] => whatever
    [2] => a
    [3] => b
)
Array
(
    [0] => whatever
    [1] => a
    [2] => b
)

The + operator still works if your associative array has the numerical keys out-of-order:

<?php

$a1 = array(0=>"whatever",);
$a2 = array(1=>"a",0=>"whatever",2=>"b");

print_r(array_merge($a1,$a2));
print_r($a1+$a2);
?>

Output:

Array
(
    [0] => whatever
    [1] => a
    [2] => whatever
    [3] => b
)
Array
(
    [0] => whatever
    [1] => a
    [2] => b
)

Notice array_merge in this case creates a new key. Not desirable...

Sunday, December 25, 2022
 
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