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Check for consecutive dates within a set and return as range

I have an array of dates which is obtained from a mySQL query. I need to divide the array into multiple arrays so that the dates in each array are contiguous.

So, if I start with

$datearray = array("2013-05-05", "2013-05-06", "2013-05-07", "2013-05-08", "2013-06-19", "2013-06-20", "2013-06-21");

I need to be able to split that into

$firstdatearray = array("2013-05-05", "2013-05-06", "2013-05-07", "2013-05-08");
$seconddatearray = array("2013-06-29", "2013-06-30", "2013-07-01");

Finally I will be able to print

5 – 8 Mar, 29 Jun – 1 Jul

How can I do that? I haven’t a clue where to start.

Answer 1

THIS IS THE COMPLETE WORKING ANSWER. (Enjoy!)

You’ll have to loop through each value in $datearray

<?php

$datearray = array("2013-05-05", "2013-05-06", "2013-05-07", "2013-05-08", "2013-06-19", "2013-06-20", "2013-06-21");
asort($datearray);
$resultArray = array();
$index = -1;
$last = 0;
$out = "";

foreach ($datearray as $date) {
    $ts = strtotime($date);
    if (false !== $ts) {
        $diff = $ts - $last;

        if ($diff > 86400) {
            $index = $index + 1;
            $resultArray[$index][] = $date;
        } elseif ($diff > 0) {
            $resultArray[$index][] = $date;
        } else {
            // Error! dates are not in order from small to large
        }
        $last = $ts;
    }
}

foreach ($resultArray as $a) {
    if (count($a) > 1) {
        $firstDate = $a[0];
        $firstDateBits = explode('-',$firstDate);
        $lastDate = $a[count($a)-1];
        $lastDateBits = explode('-',$lastDate);

        if ($firstDateBits[1] === $lastDateBits[1]) {
            $out .= intval($firstDateBits[2]) . '-' . intval($lastDateBits[2]) . ' ' . date("M",strtotime($firstDate)) . ', ';  
        } else {
            $out .= date("M d",strtotime($firstDate)) . '-' . date("M d",strtotime($lastDate)) . ', ';  
        }
    }
}

This is the output:

5-8 May, 19-21 Jun