Transpose rows and columns in a 2D array [duplicate] - php

Question

This question already has answers here:
Transposing multidimensional arrays in PHP
(12 answers)
Closed 4 years ago.
I have created a table that displays a series of numbers in a table. I am trying to transpose the matrix (flip rows and columns) using a for each loop and a function named transpose_matrix but it doesnt seem to be working for me. Where am I going wrong with this? I am working with the following code:
//Creating rows and columns for text file
echo "<h1>Data Table</h1>";
echo "<table border = 0 >";
foreach($result as $key=>$value){
echo "<tr>";
foreach($value as $v){
echo "<td>".$v."</td>";
}
echo "</tr>";
}
echo "</table>";
}
function transpose_matrix($result) {
$transpose = array(); //
foreach ($result as $key => $sub) {
foreach ($sub as $subkey => $subvalue) {
$transpose[$subkey][$key] = $subvalue;
}
}
return $transpose;
}
My first table displays as expected and looks somthing like this:
1 2 3 4 5
6 7 8 9 10
I need it to appear as such (i.e rotating the position of the rows and columns):
1 6
2 7
3 8
4 9
5 10
I have searched StackOverflow for similar questions or solutions but cannot seem to find one that works. I am fairly new to PHP also so apologies if it is a simple fix

Answer 1

This should give you what you need.
function transpose($array_one) {
$array_two = [];
foreach ($array_one as $key => $item) {
foreach ($item as $subkey => $subitem) {
$array_two[$subkey][$key] = $subitem;
}
}
return $array_two;
}
Then just pipe your existing array into the function and render the resulting array.

Answer 2

Check this: https://3v4l.org/OnuSu
$table = [
[1, 2, 3, 4, 5],
[6, 7, 8, 9, 10],
];
$i = 0;
$transpose = [];
while ($columns = array_column($table, $i++))
{
$transpose[] = $columns;
}
$table = '<table border="1">';
$rows = count($transpose);
for ($i = 0; $i < $rows; $i++){
$cols = count($transpose[$i]);
$table .= '<tr>';
for ($j = 0; $j < $cols; $j++)
{
$table .= '<td>' . $transpose[$i][$j] . '</td>';
}
$table .= '</tr>';
}
$table .= '</table>';
echo $table;

Answer 3

You can just extract the columns of the sub-arrays one-by-one:
foreach(reset($result) as $key => $values) {
$transpose[] = array_column($result, $key);
}
However this is probably better and should work even if the keys are different in each array:
$transpose = array_map(null, ...$result);

Answer 4

Your function seems to be working fine you just need to call it.
Add this below the function:
//Creating rows and columns for text file
$result[0] = ['1','2','3','4','5'];
$result[1] = ['6','7','8','9','10'];
$result[2] = ['11','12','13','14','15'];
$result[3] = ['16','17','18','19','20'];
$result[4] = ['21','22','23','24','25'];
echo "<h1>Data Table</h1>";
echo "<table border = 0 >";
foreach($result as $key=>$value){
echo "<tr>";
foreach($value as $v){
echo "<td>".$v."</td>";
}
echo "</tr>";
}
echo "</table>";
function transpose_matrix($result) {
$transpose = array(); //
foreach ($result as $key => $sub) {
foreach ($sub as $subkey => $subvalue) {
$transpose[$subkey][$key] = $subvalue;
}
}
return $transpose;
}
$mat = transpose_matrix($result);
echo "<h1>Data Table</h1>";
echo "<table border = 0 >";
foreach($mat as $key=>$value){
echo "<tr>";
foreach($value as $v){
echo "<td>".$v."</td>";
}
echo "</tr>";
}
echo "</table>";