Question

I’m having trouble splitting an array in two.

Array
(
    [0] => livree
    [1] => 2011-12-26
    [2] => livree
    [3] => 2011-12-27
    [4] => livree
    [5] => 2011-12-28
    [6] => livree
    [7] => 2011-12-29
    [8] => livree
    [9] => 2011-12-30
    [10] => livree
    [11] => 2011-12-31
    [12] => livree
    [13] => 2012-01-01
    [14] => livree
    [15] => 2012-01-02
    [16] => livree
    [17] => 2012-01-03
    [18] => en_cours
    [19] => 2012-01-04
    [20] => en_cours
    [21] => 2012-01-05
    [22] => en_cours
    [23] => 2012-01-06
    [24] => en_cours
    [25] => 2012-01-07
    [26] => en_cours
    [27] => 2012-01-08
)

I use those functions to detect odd/even key and split it in two differents array:

function odd($var){return($var & 1);}
function even($var){return(!($var & 1));}


$odd = array_filter($vb, "odd");
$even = array_filter($vb, "even");

I’m only having thoses two array:

Array
(
    [0] => 2011-12-26
    [1] => 2011-12-27
    [2] => 2011-12-28
    [3] => 2011-12-29
    [4] => 2011-12-30
    [5] => 2011-12-31
    [6] => 2012-01-01
    [7] => livree
    [8] => livree
    [9] => en_cours
    [10] => en_cours
    [11] => en_cours
    [12] => en_cours
    [13] => en_cours
)



Array
(
    [0] => livree
    [1] => livree
    [2] => livree
    [3] => livree
    [4] => livree
    [5] => livree
    [6] => livree
    [7] => 2012-01-02
    [8] => 2012-01-03
    [9] => 2012-01-04
    [10] => 2012-01-05
    [11] => 2012-01-06
    [12] => 2012-01-07
    [13] => 2012-01-08
)

What did I do wrong??? Thx for your help!

Answer 1

array_filter passes you the value, not the key. I fail to understand why you are getting exactly these results, but anyway, you don’t need array_filter at all:

Faster way to do it:

$odd = $even = array();
for ($i = 0, $l = count($vb); $i < $l;) { // Notice how we increment $i each time we use it below, by two in total
    $even[] = $vb[$i++];
    $odd[] = $vb[$i++];
}

Cuter way to do it:

foreach (array_chunk($vb, 2) as $chunk) {
    $even[] = $chunk[0];
    $odd[] = $chunk[1];
}

…and for some reason I also think you really wanted an associative array:

foreach (array_chunk($vb, 2) as $chunk) {
    $days[$chunk[1]] = $chunk[0];
}