is this true?

i heard through the grape vine that it's best to eat right after a workout because your body is still burning calories after you done. is that true or are you supposed to eat before?

and i feel like i shouldn't eat after i work out because i feel like i'm gaining back everything i just lost in a matter of a few mins.

Depending on what your workout consists of... Yes your body does continue to burn some calories after you are done working out.  But this is not the reason why you should be eating before and after you are done. 

You need to fuel your body for a workout and give your body fuel to repair itself after a workout.

You need to eat 1hr + before your workout so you actually have some energy, and then you should consume some protein and carbs after your workout to help repair the damage you just did.  When you strength train you break down your muscles, eating 30 min. within the end of your workout allows the protein to go straight to your muscles to help with the repair. 

You should not feel like you are gaining back what you just worked off.  If you are set to eat 1500 cals/day it does not matter if you eat them right after you workout, before, etc... at the end of the day you are still eating 1500 cals and still burning whatever you normally burn.  Basically, your net calories will be the same regardless of what time you workout vs. eat.