Does stock split has any effect on the stock price (i know it gets half, other than that?)
Stock split over the short-term might reduce the price (become less than the split value) if market is not very euphoric - as the number of floating shares double, supply of shares increase and so the demand should match to absorb this supply, for prices to go up.
But over the long run, prices tend to go up as the price is more affordable now and more investors can afford to buy the share (in larger quantities).
Its just a general trend, exceptions can be there.