Print data as a table

print_table.php

<?php
function echoBanner($text)
{
  $len = strlen($text);
  $line = str_pad('', $len + 4, '#');
  echo "\n\n" . $line . "\n# " . $text . " #\n" . $line . "\n\n\n";
}

function printTable($data, $columnNames = [])
{
  if (!$data || !is_array($data))
  {
    return;
  }

  $columns = _getColumnsAndMaxLengths($data);

  $header = join(' | ', array_map(function($key, $value) {
    return myString::mb_str_pad($key, $value);
  }, $columnNames ?: array_keys($columns), $columns));

  $hr = myString::mb_str_pad('', mb_strlen($header), '-');

  echo '--' . $hr . "--\n";
  echo '| ' . $header . " |\n";
  echo '|-' . $hr . "-|\n";

  foreach($data as $row)
  {
    $row = array_intersect_key($row, $columns); // only print columns that are set
    echo '| ' . join(' | ', array_map(function($value, $length) {
      return myString::mb_str_pad($value, $length);
    }, $row, $columns)) . " |\n";
  }

  echo '--' . $hr . "--\n";
}

/**
 * Get the lengths of each column so they can be lined up nicely for printing
 * @return array an array of key-value pairs where the key is the column title and the value is either the length of
 *               the longest string in that column or the length of the column title, whichever is longer
 */
function _getColumnsAndMaxLengths($data)
{
  return array_reduce(

    # replace each value with the length of that value
    array_map(function($row) {
      return array_map(function($value) {
        return mb_strlen($value);
      }, $row);
    }, $data),

    # find the max length of each value (or the length of the column name) across all rows
    function($a, $b) {
      if (!$a) $a = $b;
      $ret = [];
      foreach ($a as $key => $value)
      {
        $ret[$key] = max($a[$key], $b[$key], mb_strlen($key));
      }
      return $ret;
    }
  );
}