function f_keyFilter($tester, $in, $keys=null) {
//??
if(!isset($keys)) {
$keys = array_keys($in);
}
if(!empty($in)) {
if($tester(f_first($keys))) {
return f_construct(
f_first($in),
f_keyFilter(
$tester,
f_rest($in),
f_rest($keys)
)
);
} else {
return f_keyFilter(
$tester,
f_rest($in),
f_rest($keys)
);
}
} else {
return array();
}
}
function chain($baseItem, $items = array())
{
return eval(D::log('return ' . join('->', f_construct('$baseItem', (array) $items)) . ';', 'evalers'));
}