Question

I Want to Union 2 array $A and $B Example:

$A = Array(
    0=>array(
            'lable' =>"label0",
            'id_poste'=>1,
            'id_part'=>11
    ),
    1=>array(
            'lable' =>"label1",
            'id_poste'=>2,
            'id_part'=>12
            ),
    2=>array(
            'lable' =>"label2",
            'id_poste'=>3,
            'id_part'=>13
    ),
    3=>array(
            'lable' =>"label3",
            'id_poste'=>4,
            'id_part'=>14
            )
);

$B = Array(
    0=>array(
            'lable' =>"label0",
            'id_poste'=>1,
            'id_part'=>11
    ),
    1=>array(
            'lable' =>"label1_X",
            'id_poste'=>2,
            'id_part'=>12
            ),
    2=>array(
            'lable' =>"label2",
            'id_poste'=>3,
            'id_part'=>13
    ),
    3=>array(
            'lable' =>"label3_X",
            'id_poste'=>4,
            'id_part'=>14
            )
);

The result of union between these two array will be

/*
$result => Array(
    0=>array(
            'lable' =>"label0",
            'id_poste'=>1,
            'id_part'=>11
    ),
    1=>array(
            'lable' =>"label1",
            'id_poste'=>2,
            'id_part'=>12
            ),
    2=>array(
            'lable' =>"label1_X",
            'id_poste'=>2,
            'id_part'=>12
            )       
    3=>array(
            'lable' =>"label2",
            'id_poste'=>3,
            'id_part'=>13
    ),
    4=>array(
            'lable' =>"label3",
            'id_poste'=>4,
            'id_part'=>14
            ),
    5=>array(
            'lable' =>"label3_X",
            'id_poste'=>4,
            'id_part'=>14
            )
);
*/

I have tried with :

$C = $A+$B;
echo '<pre>';
print_r($C);
echo '</pre>'

But the result is not what I expected ? Anybody could help please?

Thanks

EIDT:

if using array_merge($A, $B);

Array
(
[0] => Array
    (
        [lable] => label0
        [id_poste] => 1
        [id_part] => 11
    )

[1] => Array
    (
        [lable] => label1
        [id_poste] => 2
        [id_part] => 12
    )

[2] => Array
    (
        [lable] => label2
        [id_poste] => 3
        [id_part] => 13
    )

[3] => Array
    (
        [lable] => label3
        [id_poste] => 4
        [id_part] => 14
    )

[4] => Array
    (
        [lable] => label0
        [id_poste] => 1
        [id_part] => 11
    )

[5] => Array
    (
        [lable] => label1_X
        [id_poste] => 2
        [id_part] => 12
    )

[6] => Array
    (
        [lable] => label2
        [id_poste] => 3
        [id_part] => 13
    )

[7] => Array
    (
        [lable] => label3_X
        [id_poste] => 4
        [id_part] => 14
    )

)

Like we see here the array is duplicated : So we using array_unique But we still got an error or warning .

Array to string conversion in C:\Program Files\EasyPHP-12.1\www\PHP\array_union.php on line 86

Answer 1

I get a solution that is kind a tricky.
I will merge A and its difference with B. To determine this difference, I use array_udiff:
I think it’s tricky because it relies on the identification with lable key.

$C = array_merge($A, 
            array_udiff($B, $A, 
                        function($a,$b){
                            return strcmp($a['lable'],$b['lable']);
                        }
           )
);