Why does this query have .?

[Ceys]

I want to know why the following query have . and "" in ".$_POST['date']." etc.\[code\]$query = "INSERT INTO eventcal ('eventDate','eventTitle','eventContent','user','user_id') VALUES('".$_POST['date']."','".addslashes($_POST['eventTitle'])."','".addslashes($_POST['eventContent'])."')"; \[/code\]If I change to the following, will it make any differences?\[code\]VALUES('$_POST['date']','addslashes($_POST['eventTitle'])','addslashes($_POST['eventContent'])')\[/code\]Thanks in advance.