两个数组中的对象数组

Question

If i have the following array

$arr = [4,7,8];
$var = 3

and need the following result using PHP functions and operators or most efficient way for large arrays.

$result = [
 [3,4],
 [3,7],
 [3,8]
]

Answer 1

My way is the following

$col1 = array_pad($vals,sizeof($arr),$var); // [3,3,3]
$result = array_map(null,$col1,$arr);