How to Transpose a 2D Array and Convert it to a Comma-Separated Column, Pipe-Separated Row String?

Transposing a 2D Array and Converting it to a String with Comma-Separated Columns and Pipe-Separated Rows

Given a multidimensional array, transpose it to convert columns into rows. Additionally, generate a string representation of the transposed array, where each row is separated by a pipe character ('|'), and elements within each row are separated by commas (,).

Example:

Consider the following 2D array:

01 03 02 15
05 04 06 10
07 09 08 11
12 14 13 16

Desired Output:

01,05,07,12|03,04,09,14|02,06,08,13|15,10,11,16

Solution:

This task can be accomplished in two steps:

1. Transpose the Array:

   • Create a new array where the original rows become columns, and vice versa.

2. Create the String Representation:

   • Iterate over each row of the transposed array.
   • Join the elements of each row with commas (,).
   • Join the rows with a pipe character (|).

JavaScript Implementation:

<code class="javascript">// Transpose the array
const transposedArray = originalArray.map((row, i) => row.map((el, j) => originalArray[j][i]));

// Create the string representation
const result = transposedArray.map(row => row.join(",")).join("|");</code>

PHP Implementation:

<code class="php">// Transpose the array
$transposedArray = array();
foreach ($originalArray as $row) {
  foreach ($row as $key => $value) {
    $transposedArray[$key][] = $value;
  }
}

// Create the string representation
$result = array_map(function($row) { return implode(",", $row); }, $transposedArray);
$result = implode("|", $result);</code>

The above is the detailed content of How to Transpose a 2D Array and Convert it to a Comma-Separated Column, Pipe-Separated Row String?. For more information, please follow other related articles on the PHP Chinese website!