chunk array vertically
$arr = range(1, 19);
function array_chunk_vertical($arr, $percolnum){
$n = count($arr);
$mod = $n % $percolnum;
$cols = floor($n / $percolnum);
$mod ? $cols++ : null ;
$re = array();
for($col = 0; $col < $cols; $col++){
for($row = 0; $row < $percolnum; $row++){
if($arr){
$re[$row][] = array_shift($arr);
}
}
}
return $re;
}
$result = array_chunk_vertical($arr, 6);
foreach($result as $row){
foreach($row as $val){
echo '['.$val.']';
}
echo '<br/>';
}
/*
[1][7][13][19]
[2][8][14]
[3][9][15]
[4][10][16]
[5][11][17]
[6][12][18]
*/
