If you put space in keys in your test.php RadixTrie will not find them:
['carp 1', 'v. To complain'],
['carp 2', 'n. A species of fish, not good with chips'],
['carp enter', 'n. A person that mends carps'],
['carp entry', 'n. Complaints by a carpenter']
If you put space in keys in your test.php RadixTrie will not find them: