Make 5 minute interval - php

Question

I'm trying to separate the dates for example:
$arr=array(
"2018-06-27 20:30:20",
"2018-06-27 20:31:20",
"2018-06-27 20:37:20",
"2018-06-27 20:45:20",
"2018-06-27 20:48:20"
);
As you can see there are minutes with difference only of 1 minute or even seconds.
What I'm trying to accomplish is to force the dates to be 5 mins interval.
example output
2018-06-27 20:30:00
2018-06-27 20:35:00
2018-06-27 20:40:00
2018-06-27 20:45:00
2018-06-27 20:50:00
Here's my code
function roundToNearestMinuteInterval($time)
{
$time = (round(strtotime($time) / 300)) * 300;
return date('Y-m-d H:i:s', $time);
}
$temp="";
$wave=1;
foreach($arr as $a) {
if(empty($temp)) {
$temp= roundToNearestMinuteInterval($a);
}
$date= roundToNearestMinuteInterval($a);
if($temp==$date && $wave!=1){
$new=date('Y-m-d H:i:s',strtotime('+3 minutes',strtotime($a)));
$date= roundToNearestMinuteInterval($date);
$temp= $date;
}
$wave++;
echo $date."<br/>";
}

Answer 1

If you want to have an output array with all the 5 minute (or other interval) times between the earliest and latest times in the input array, you can just iterate between them, adding the interval in each loop:
$arr=array("2018-06-27 20:30:20","2018-06-27 20:31:20","2018-06-27 20:37:20","2018-06-27 20:45:20","2018-06-27 20:48:20");
function roundToNearestMinuteInterval($time, $interval) {
$timestamp = strtotime($time);
$rounded = round($timestamp / ($interval * 60), 0) * $interval * 60;
return $rounded;
}
$interval = 5; // minutes
$start = roundToNearestMinuteInterval(min($arr), $interval);
$end = roundToNearestMinuteInterval(max($arr), $interval);
for (; $start <= $end; $start += $interval * 60) {
$results[] = date('Y-m-d H:i:s', $start);
}
print_r($results);
Output:
Array
(
[0] => 2018-06-27 20:30:00
[1] => 2018-06-27 20:35:00
[2] => 2018-06-27 20:40:00
[3] => 2018-06-27 20:45:00
[4] => 2018-06-27 20:50:00
)
Demo on 3v4l.org

Answer 2

Solution with a DateTime extension dt (https://github.com/jspit-de/dt) returns an array with the date as a key. The value supplied is the number of rounded values ​​from the input array. The algorithm can be implemented even without class extension with a few more commands.
$inputArr = array(
"2018-06-27 20:30:20",
"2018-06-27 20:31:20",
"2018-06-27 20:37:20",
"2018-06-27 20:45:20",
"2018-06-27 20:48:20"
);
$interval = "5 Minutes";
//create basis
$resArr = [];
$dt = dt::create(min($inputArr))->round($interval); //start
$endDate = dt::create(max($inputArr))->round($interval);
for(;$dt <= $endDate; $dt->modify($interval)){
$key = $dt->format("Y-m-d H:i:s");
$resArr[$key] = 0;
}
foreach($inputArr as $strDate){
$key = $dt::create($strDate)
->round($interval)
->format("Y-m-d H:i:s");
$resArr[$key]++;
}
The result $resArr
array (
'2018-06-27 20:30:00' => 2,
'2018-06-27 20:35:00' => 1,
'2018-06-27 20:40:00' => 0,
'2018-06-27 20:45:00' => 1,
'2018-06-27 20:50:00' => 1,
)