Grouping php arrays and showing highest and lowest value in the array - php

Question

I have an array that looks like this:
Array
(
[0] => Array
(
[0] => 19.0001.2
[1] => 1
[2] => 1
)
[1] => Array
(
[0] => 19.0001.2
[1] => 1
[2] => 2
)
[2] => Array
(
[0] => 19.0001.2
[1] => 1
[2] => 3
)
[3] => Array
(
[0] => 19.0001.2
[1] => 1
[2] => 4
)
[4] => Array
(
[0] => 19.0001.2
[1] => 1
[2] => 5
)
[5] => Array
(
[0] => 19.0001.2
[1] => 1
[2] => 6
)
[6] => Array
(
[0] => 19.0001.2
[1] => 1
[2] => 7
)
[7] => Array
(
[0] => 19.0001.2
[1] => 1
[2] => 8
)
[8] => Array
(
[0] => 19.0001.2
[1] => 1
[2] => 9
)
[9] => Array
(
[0] => 19.0001.2
[1] => 1
[2] => 10
)
[10] => Array
(
[0] => 19.0001.2
[1] => 1
[2] => 11
)
[11] => Array
(
[0] => 19.0001.2
[1] => 1
[2] => 12
)
[12] => Array
(
[0] => 19.0001.2
[1] => 1
[2] => 20
)
[13] => Array
(
[0] => 19.0001.2
[1] => 1
[2] => 21
)
[14] => Array
(
[0] => 19.0001.2
[1] => 1
[2] => 22
)
[15] => Array
(
[0] => 19.0001.2
[1] => 1
[2] => 23
)
[16] => Array
(
[0] => 19.0001.2
[1] => 1
[2] => 24
)
[17] => Array
(
[0] => 19.0001.2
[1] => 1
[2] => 25
)
[18] => Array
(
[0] => 19.0001.2
[1] => 1
[2] => 26
)
[19] => Array
(
[0] => 19.0001.2
[1] => 1
[2] => 27
)
[20] => Array
(
[0] => 19.0001.2
[1] => 1
[2] => 33
)
[21] => Array
(
[0] => 19.0001.2
[1] => 2
[2] => 30
)
[22] => Array
(
[0] => 19.0001.2
[1] => 2
[2] => 35
)
[23] => Array
(
[0] => 19.0001.2
[1] => 2
[2] => 46
)
[24] => Array
(
[0] => 19.0001.2
[1] => 2
[2] => 47
)
[25] => Array
(
[0] => 19.0001.2
[1] => 2
[2] => 48
)
[26] => Array
(
[0] => 19.0001.2
[1] => 2
[2] => 50
)
[27] => Array
(
[0] => 19.0001.2
[1] => 3
[2] => 1
)
[28] => Array
(
[0] => 19.0001.3
[1] => 2
[2] => 40
)
[29] => Array
(
[0] => 19.0001.3
[1] => 2
[2] => 41
)
[30] => Array
(
[0] => 19.0001.3
[1] => 2
[2] => 42
)
[31] => Array
(
[0] => 19.0001.3
[1] => 3
[2] => 7
)
[32] => Array
(
[0] => 19.0001.3
[1] => 3
[2] => 8
)
[33] => Array
(
[0] => 19.0001.3
[1] => 3
[2] => 9
)
[34] => Array
(
[0] => 19.0001.3
[1] => 3
[2] => 13
)
[35] => Array
(
[0] => 19.0001.3
[1] => 4
[2] => 41
)
[36] => Array
(
[0] => 19.0001.4
[1] => 1
[2] => 2
)
[37] => Array
(
[0] => 19.0001.4
[1] => 1
[2] => 3
)
[38] => Array
(
[0] => 19.0001.4
[1] => 1
[2] => 4
)
[39] => Array
(
[0] => 19.0001.8
[1] => 4
[2] => 40
)
[40] => Array
(
[0] => 19.0009.8
[1] => 3
[2] => 8
)
)
I have a function that groups the last value in an array into a range of numbers, however it doesn't work with the above array. I have tried a number of different arrays with no success. The above array is generated by a mysql query result.
$getlocations = $db->query("
SELECT barcode
, test_num
, magnum
, sect
, slidenum
FROM fas_log
WHERE barcode LIKE '%$bcinv'
AND notes = '$notes'
AND removed = '$removed'
AND staffid= '$sid'
ORDER BY magnum, sect, slidenum
");
while ($getlocationsrow = $getlocations->fetch()) {
extract($getlocationsrow);
$magrange[]=array("$magnum", "$sect", "$slidenum");
}
function rangeslides($arr) {
$previous = null;
$result = array();
$consecutiveArray = array();
// Slice array by consecutive sequences
foreach($arr as $number) {
if ($number == $previous + 1) {
$consecutiveArray[] = $number;
} else {
$result[] = $consecutiveArray;
$consecutiveArray = array($number);
}
$previous = $number;
}
$result[] = $consecutiveArray;
// Get length of each sub array
$count = array_map('count', $result);
$first = reset($count);
$last = end($count);
prettyarray($result);
}
I want to extract data from the array to look like this showing the first and last numbers in the range:
19.0001.2 1 - 12
The above array should produce 15 different results with 9 of them showing no range of numbers because they are singular.
ie: 19.0001.8 4 40