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up vote -1 down vote favorite

I want get the keys of continuous values of an array. For example:

how to change this array:

array(
   2 => 11,
   3 => 11,
   4 => 11,
   6 => 12,
   7 => 13,
   8 => 13,
   10 => 11,
   11 => 11,
   12 => 14
)

to this one:

array(
    array(2, 3, 4),
    array(6),
    array(7, 8),
    array(10, 11),
    array(12)
)

Thx in advance!

share|improve this question

2 Answers 2

up vote 0 down vote accepted 
$data = array(
   2 => 11,
   3 => 11,
   4 => 11,
   6 => 12,
   7 => 13,
   8 => 13,
   10 => 11,
   11 => 11,
   12 => 14
);

$result = array();
array_walk(
    $data,
    function ($value, $key) use (&$result){
        static $v;
        if ($value == $v) {
            $result[max(array_keys($result))][] = $key;
        } else {
            $result[] = array($key);
        }
        $v = $value;
    }
);

var_dump($result);
share|improve this answer
    
Wow~your code rocks, simple and clean. Tons of thx! –  tonylevid May 7 at 1:53
up vote 1 down vote

Edited Code.

<?php
$arr = [2 => 11, 3 => 11,4 => 11, 6 => 12, 7 => 13, 8 => 13, 10 => 11, 11 => 11,12 => 14];

$newArr = [];
$lastVal = null;
$currArr = [];
foreach($arr AS $key=>$value){
    if($lastVal == $value){
        $curArr[] = $key;
    }else{
        if($lastVal != null){
            $newArr[] = $curArr;
        }
        $lastVal = $value;
        $curArr = [$key];
    }
}
$newArr[] = $curArr;

I'm sure there's a more elegant way.

share|improve this answer
    
No, your code will change array to this: code array ( 11 => array ( 0 => 2, 1 => 3, 2 => 4, 3 => 10, 4 => 11, ), 12 => array ( 0 => 6, ), 13 => array ( 0 => 7, 1 => 8, ), 14 => array ( 0 => 12, ), ) code –  tonylevid May 6 at 14:11
    
See updated code. –  Jessica May 6 at 14:17
    
Your code works now! Thx! –  tonylevid May 7 at 1:30

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