Has someone done this level? I get that i'm supposed to bypass the trim function, but i don't see how could this be done if every relevant character has been blacklisted except for the redirection (>). There's a similar question posted here but the answers didn't help, they where just hints.
This is what the help states:
The developer has either made a slight typo with the filters and believes a certain PHP command will save them from this mistake.
Spoiler: trim() removes all leading & trailing spaces, right?.