PHP 中的数组和 integer 映射

Question

Inputs

hello every I have array-like this

 $A=[1,2,3]; $B=1;

but I want output like this

Output

 [{1,1},{1,2},{1,3}]

Answer 1

For example like this:

$A = [1, 2, 3];
$B = 1;
$result = [];

foreach ($A as $key => $value) {
    $result[] = [$B, $value];
}

print_r(json_encode($result)); // [[1,1],[1,2],[1,3]]

Or like this:

$A = [1, 2, 3];
$B = 1;

array_walk($A, function(&$item) use ($B) { $item = [$B, $item]; });

print_r(json_encode($A)); // [[1,1],[1,2],[1,3]]