Question

I need to combine 2 arrays under the same key by appending Array2 to Array1:

Array1
(
    [0] => value1
    [1] => value2
    [2] => value3
    [3] => value4
    [4] => value5
    [5] => value6
    [6] => value7
)
Array2
(
    [0] => add1
    [1] => add2
    [2] => add3
    [3] => add4
    [4] => add5
    [5] => add6
    [6] => add7
)

so that Array3 looks like this:

Array1
(
    [0] => value1add1
    [1] => value2add2
    [2] => value3add3
    [3] => value4add4
    [4] => value5add5
    [5] => value6add6
    [6] => value7add7
)

I searched through php.net but I wasn’t able to find anything. Any help would be much appreciated! Thank you in advance for your input.

Answer 1

array_map^docs makes looping superfluous in this case:

$arr1 = array('value1','value2','value3');
$arr2 = array('add1','add2','add3');
$merged = array_map(function($x, $y) { return $x . $y; }, $arr1, $arr2);

If you don’t have PHP5.3+ (or you don’t like lambda) you’ll need to define the closure in a separate function and reference that function’s name instead inside your array_map call.