php - array for loop syntax -

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if have:

$data = array(   'id01' => array(     'firstname' => 'eric',     'lastname' => 'smith',   ),   'id02' => array(     'firstname' => 'john',     'lastname' => 'turner',   ), );  foreach ( $data $key){     print "$key[firstname]<br>";     echo $key[0]; }

the $key[0] part not working...basically i'm trying output id01, id02, id part of array forloop processing...

any ideas on correct syntax?

what need 

foreach ($data $key => $val){     print "$val[firstname]<br>"; //changed $val     echo $key; //prints id01, id02 }

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