I have a fwrite function to write log for delay insert to the database.

We have a visit rate of 20,000 Visits per hour. 

so it's 0.18s per fwrite.

My question is that is it possible that PHP will miss several log when there are 2 or 3 visitor come in at the same time?

If it's then how can I make this concurrent?

My code is just normal Fopen fwrite fclose.