What is use of time() Function in php ?

Php time() function basically use for returns a current unix timestamp. In which, you can utilize the date() function to format it to your desiderata.

You can see below example of time() function.

<?php
        $Currenttime=time();
       //$Currenttime is a variable in which store current  date and time
        echo($Currenttime . "<br>");
        //when echo $Currenttime  then echo only date in this 1448270711 format

        echo(date("Y-m-d",$Currenttime). "<br>");
        //when echo $Currenttime  in ("Y-m-d") format then date will come 2015-11-23

         // If you want print current date and time both then use echo(date("Y-m-d h:i:sa",$Currenttime));
         //look like this:
          echo(date("Y-m-d h:i:sa",$Currenttime));

    ?>     

So, finally output will come

1448271768

2015-11-23

2015-11-23 03:12:48pm