PHP Date processing rollup, specifying the date plus and minus days, looping two dates between the specified dates

One.

(1) How many days to add or subtract the specified date

(2) cycle the date between two specified dates

Cases:

$start _time = ' 2017-07-01 ';
$end _time = ' 2017-07-10 ';

Get time difference

$diff = Strtotime ($end _time)-strtotime ($start _time);
$num = $diff/(24*60*60) +1;

for ($i =0; $i < $num; $i + +) {
$selectTime = Date ("y-m-d", Strtotime ("$end _time-$i Days"); Focus, specify the date plus and minus how many days
echo $selectTime. ' <br> ';
}

Output:

2017-07-10
2017-07-09
2017-07-08
2017-07-07
2017-07-06
2017-07-05
2017-07-04
2017-07-03
2017-07-02
2017-07-01

PHP Date processing rollup, specifying the date plus and minus days, looping two dates between the specified dates