PHP: Can I get the index in an array_map function?

Question

I\'m using a map in php like so:

function func($v) {
    return $v * 2;
}

$values = array(4, 6, 3);
$mapped = array_map(func, $values);
var_dump($mapped);
         


        

Answer 1

Very simple:

Only array_map fuction: does not have index key!

 $params = [4,6,2,11,20];

 $data = array_map(function($v) { return ":id{$v}";}, $params);

 array (size=5)
  0 => string ':id4' (length=4)
  1 => string ':id6' (length=4)
  2 => string ':id2' (length=4)
  3 => string ':id11' (length=5)
  4 => string ':id20' (length=5)

Now, combine with array_keys:

$data = array_map(
    function($k) use ($params) { return ":id{$k}_${params[$k]}"; },
    array_keys($params)
 );

array (size=5)
  0 => string ':id0_4' (length=6)
  1 => string ':id1_6' (length=6)
  2 => string ':id2_2' (length=6)
  3 => string ':id3_11' (length=7)
  4 => string ':id4_20' (length=7)