How to parse true and false string in an array to become booleans

Question

How do I parse the true and false string in an array to become boolean if they exist?

For instance,

form

$config = array(
    "allow_n" => "true",
    "allow_m" => "false",
    "say"     => "hello"
);

to

$config = array(
    "allow_n" => true,
    "allow_m" => false,
    "say"     => "hello"
);

Is it possible?

EDIT:

Thanks guys for the help.

Sorry I forgot to clarify from the beginning - this case may happen in a multidimentinal array, for instance,

$config = array(
    "allow_n" => "true",
    "allow_m" => "false",
    "say"     => "Hello",
    "php"   => array(
        "oop" => "true",
        "classic" => "false"
    )
);

Answer 1

you can use array_walk_recursive to achieve this :

Example

$config = array (
        "allow_n" => "true",
        "allow_m" => "false",
        "say" => "Hello",
        "php" => array (
                "oop" => "true",
                "classic" => "false" 
        ) 
);
var_dump ( $config );

array_walk_recursive ( $config, function (&$item) {
    if ($item == "true") {
        $item = true;
    } else if ($item == "false") {
        $item = false;
    } else if (is_numeric ( $item )) {
        $item = intval ( $item );
    }
} );

var_dump ( $config );

Output Before

'allow_n' => string 'true' (length=4)
  'allow_m' => string 'false' (length=5)
  'say' => string 'Hello' (length=5)
  'php' => 
    array
      'oop' => string 'true' (length=4)
      'classic' => string 'false' (length=5)

Output After

    array
  'allow_n' => boolean true
  'allow_m' => boolean false
  'say' => string 'Hello' (length=5)
  'php' => 
    array
      'oop' => boolean true
      'classic' => boolean false

Answer 2

foreach ($config as $k=>$v)
{
  $low_v = strtolower($v);
  if ($low_v == 'true')
    $config[$k] = true;
  else if ($low_v == 'false')
    $config[$k] = false; 
}