how can add special characters to keys of array

Question

I want add special character to keys of my array, like this example.
how can i convert this array

$tmp = array(
"name" => "aya",
"number" => "10");

to

$tmp = array(
"[name]" => "aya",
"[number]" => "10");  

Answer 1

You can use this code:

foreach ($tmp as $key=> $value) {
    unset($tmp[$key]);
    $tmp["[$key]"] = $value;
}