phparraysassociative-arrayarray-merge

Merge two associative arrays without losing elements during key collisions

In a piece of software, I merge two arrays with array_merge function. But I need to add the same array (with the same keys, of course) to an existing array.

The problem:

 $A = array('a' => 1, 'b' => 2, 'c' => 3);
 $B = array('c' => 4, 'd'=> 5);
 
 array_merge($A, $B);

 // result
 [a] => 1 [b] => 2 [c] => 4 [d] => 5

As you see, 'c' => 3 is missed.

So how can I merge all of them with the same keys?

Solution

  • Try with array_merge_recursive

    $A = [
  'a' => 1,
  'b' => 2,
  'c' => 3,
];

$B = [
  'c' => 4,
  'd'=> 5,
];

$c = array_merge_recursive($A,$B);

echo "<pre>";
print_r($c);
echo "</pre>";

    will return

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

    [d] => 5
)