How do you remove a value that has an empty key from an associative array in PHP?

foreach ($array as $index => $value) {
    echo $index;
    echo ' is ';
    echo gettype($index);
    echo "n";
}

$someList = Array('A' => 'Foo', 'B' => 'Bar', '' => 'Bah');
print_r($someList);
echo '<br/>';
unset($someList['A']);
print_r($someList);
echo '<br/>';
unset($someList['']);
print_r($someList);
echo '<br/>';

Array ( [A] => Foo [B] => Bar [] => Bah )
Array ( [B] => Bar [] => Bah )
Array ( [B] => Bar )

<?php

$arr = array(
    	false 	=> 1
    ,	true	=> 2
    ,	null	=> 3
    ,	'test'	=> 4
//  ,	''		=> 5
);

print_r( $arr );

foreach ( $arr as $key => $value )
{
    var_dump( $key );
}

unset( $arr[''] );

print_r( $arr );

Array
(
    [0] => 1
    [1] => 2
    [] => 3
    [test] => 4
)
int(0)
int(1)
string(0) ""
string(4) "test"
Array
(
    [0] => 1
    [1] => 2
    [test] => 4
)

var_export($array);
echo "n";
unset($array[""]);
var_export($array);

array (
  '' => 1,
)
array (
)