重复并合并PHP数组

Question

With array_fill, I want to repeat and merge array.

Example, when I execute :

$array = array_fill(0, 2, array_merge(
   ['hello'],
   ['by']
));

var_dump($array);

I have this result :

array(2) {
  [0]=>
  array(2) {
    [0]=>
    string(5) "hello"
    [1]=>
    string(2) "by"
  }
  [1]=>
  array(2) {
    [0]=>
    string(5) "hello"
    [1]=>
    string(2) "by"
  }
}

But I want this result :

array(4) {
    [0]=>
    string(5) "hello"
    [1]=>
    string(2) "by"
    [2]=>
    string(5) "hello"
    [3]=>
    string(2) "by"
}

Answer 1

Add one more step - merge all these arrays into one:

$array = array_merge(...array_fill(0, 2, array_merge(
   ['hello'],
   ['by']
)));

Here I used a variadic function argument syntax. If your php version (older than php5.6) doesn't support it, use call_user_func_array:

$array = call_user_func_array('array_merge', array_fill(0, 2, array_merge(
   ['hello'],
   ['by']
)));