function - php dynamically get time range?

Question

I want to implement a function. For example, if I want to get the time of the last 3 days, I will pass parameter 3 and return a string of 2017-06-18 - 2017-06-20. What should I do?

Answer 1

To dynamically obtain the time range, assign the n value of the last n days to $day

<?php
    $day = 3;
    echo date("Y-m-d",strtotime("-".$day." days")).' - '.date("Y-m-d",time());
?>

Answer 2

echo date("Y-m-d",strtotime("-3 days")).' - '.date("Y-m-d",time());exit();