在PHP中内爆二维数组

Question

I have an array like:

Array
(
    [0] => Array
        (
            [0] => a
            [1] => b
        )

    [1] => Array
        (
            [0] => c
        )

    [2] => Array
        (
            [0] => d
            [1] => e
            [2] => f
        )

)

I want to convert my array to a string like below:

$arrtostr = 'a,b,c,d,e,f';

I've used implode() function but it looks like it doesn't work on two-dimensional arrays.

What should I do?

Answer 1

Alternatively, you could use a container for that first, merge the contents, and in the end of having a flat one, then use implode():

$letters = array();
foreach ($array as $value) {
    $letters = array_merge($letters, $value);
}

echo implode(', ', $letters);

Sample Output