Are knock-off generic brand iphone chargers safe?

I'm looking to get a 6ft or longer charger for my iPhone 4S. I tried apple's website and they only had longer chargers for iPhone 5. I found a bunch on amazon, eBay, and other generic websites for much less than apple chargers, but I read online that these knock offs aren't safe and can harm my phone and possibly even harm me. Does anyone with more knowledge on chargers/ any electronics background know if this is true and a big problem or not? I don't wanna ruin my phones battery life but I need a longer charger for my dorm. And if the rumors are true, does anyone know where I can find a safe reputable brand iphone4s 6ft-10ft charger?

I think they're safe I never buy name brand chargers and nothing bad had happened to me or my phone. Check amazon.

As long as you're using the Apple USB charger, you're fine. Just get a longer cable.

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