Something like following might help
for($i = 0; $i < 3; $i++) {
for($j = 0; $j < 4; $j++) {
echo $arr[$j][$i];
}
}
You effectively cycle through 3 columns ($i) and 4 rows ($j) and reference the appropriate $arr elements.
If you wanted to use a more dynamic (count) based solution, you would use e.g:
$count = count($arr);
for($i = 0; $i < 3; $i++) {
for($j = 0; $j < $count; $j++) {
echo $arr[$j][$i];
}
}
note: it is more efficient to count() outside the for loop, so you only call the function once and use the result inside the loop.
$arr corresponds to the $j index in this case. Should just be for ($j = 0; $j < $count; $j++).This simple solution apply to use non-predefined length of the main array and its child:
$arr=array(array(1,2,3),
array(4,5,6),
array(7,8,9),
array(10,11,12));
$count_arr = count($arr); // length of the main array
$count_arr_arr = count($arr[0]);// length of the child array (each child should be the same length)
$res_arr = [];
for($i = 0; $i < $count_arr_arr; $i++){
for($j = 0; $j < $count_arr; $j++){
$res_arr[] = $arr[$j][$i]; // getting elements from child arrays
}
}
echo join(', ', $res_arr); // presenting the result as a string '1, 2, 3, etc.'
You can use loop nesting for that. So iterate through the array and increase the index of the column on each outer loop. Store the values in a new array for proper output.
$arr=array(array(1,2,3),
array(4,5,6),
array(7,8,9),
array(10,11,12));
$new = [];
$i = 0;
foreach($arr as $set) {
foreach($arr as $data) {
if(isset($data[$i])) $new[] = $data[$i];
}
$i++;
}
echo join(',', $new), PHP_EOL;
1,4,7,10,2,5,8,11,3,6,9,12
for($i = 0; $i < count($arr); $i++) { for($u = 0; $u <count($arr[$i]); $j++) { echo $arr[$i][$u]; echo '<br />'; } }