How do you refer to arrays within arrays in PHP

If I did this:

<?php
$array = array();
$array['bar'] = "bar";
$array['foo'] 开发者_StackOverflow= array();
?>

How do I add values into the $array['foo'] array? (but not like add another array into that just keys and values)

$array['foo']['blah'] = 'asdf';

<?php
$array = array();
$array['bar'] = 'bar';
$array['foo'] = array();

$array['foo']['key'] = 'var'; // if you want it to be hash table
or
$array['foo'][] = 'var'; // generates the index for you.
?>

Then if you want to access that thing:

<?php echo $array['foo']['key']; ?>

Or if you used the [] way:

<?php echo $array['foo'][0]; ?>

$array['foo']['x'] = 'something';

$array['foo'][] = $your_value_to_insert;

You can do something like this:

$array['foo'] = array('id' => 1, 'name' => 'abc');

like @cyclone and:

$array['foo'] = array("foo" => "bar", 12 => true);