Help with multidimensional Arrays in PHP

How can I get the key and the value ? I tried using key() but it didn't work:

$array_newbie = array();
$array_newbie['121412'] = "Hello";
$array_newbie['121212'] = "Noob";
$array_newbie['155161'] = "nabbaa";
foreach($array_newbie as $k)
{
echo key($array_newbie) . "\n";
}

this outputs:

121212
开发者_如何学JAVA121212
121212

how can I get the key value ? I want it to output

121412
121212
155161

i'm new to php and having trouble with this multi dimensional arrays, thanks

---

key() is getting the key of the current array pointer. In your case, it is always 0.

You can get it via the foreach.

foreach($array_newbie as $key => $k) {
    echo $key . "\n";
}

Also, that array is an associative array, not a multi-dimensional array.

The latter is an array of whom their members are also arrays...

$arr = array(
   array(
      'a', 'b', 'c'
   ),
   array(
      'd', 'e', 'f'
   )
);