Iphone charger not working anymore but no issue with charger or phone?

I have an apple charger (which I got with the phone) it's been working fine for about a year. But it's starting saying 'unlock iPhone to use accessories' when I'm trying to charge it. Even when I unlock the phone it won't charge (or it charges very slowly with no charging symbol to say it's charging). And I was wondering why this is happening? Other non-apple chargers work fine and there's no issue with the charger wire itself. Is there a way to fix this or is something damaged?

Buy a new one

Just buy a new one, if this one is damaged it might damage your phone too.

No. By definition, you DO have an issue.

Your charger is broken. You better toss it before it damages the iPhone.

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