如何连接两个数组键？

Question

I would like to know if there is a way to convert two Array keys into one Array key?

As an example the Array would look like:

[0] => '12345' 
[1] => 'New'
[2] => 'York'

how can I combine [1] => 'New' and [2] => 'York' into [1] => 'New York'?

All I was found is array_merge that combines two Arrays. Even on how to concaternate two Array keys I could not find anything.

Thanks alot.

Answer 1

You can try :

$data = array(12345,"New","York");
echo concat($data, array(1,2)); //New York

//or

$data = array(12345,"New","York");
print_r(concatArray($data, array(1,2))); 

Output

Array
(
    [0] => 12345
    [1] => New York
)

Function Used

function concat($array, $keys , $glue = " ") {
    $values = array_intersect_key($array, array_flip($keys));
    return implode($glue, $values);
}


function concatArray($array, $keys, $glue = " ") {
    $last = null;
    foreach ( $array as $key => &$value ) {
        if (in_array($key, $keys)) {
            if ($last === null) {
                $last = $key;
                continue;
            }
            $array[$last] .= $glue . $value;
            unset($array[$key]);
        }
    }
    return $array;
}