PHP merge xml files

merge-xml.php

#!/usr/bin/env php
<?php

function println($text, $foregroundColor = NULL, $backgroundColor = NULL) {
  $colors = [
    'background' => [
      'black' => '40',
      'blue' => '44',
      'cyan' => '46',
      'green' => '42',
      'lightGray' => '47',
      'magenta' => '45',
      'red' => '41',
      'yellow' => '43',
    ],
    'foreground' => [
      'black' => '0;30',
      'blue' => '0;34',
      'brown' => '0;33',
      'cyan' => '0;36',
      'darkGray' => '1;30',
      'green' => '0;32',
      'lightBlue' => '1;34',
      'lightCyan' => '1;36',
      'lightGray' => '0;37 ',
      'lightGreen' => '1;32',
      'lightPurple' => '1;35',
      'lightRed' => '1;31',
      'purple' => '0;35',
      'red' => '0;31',
      'white' => '1;37',
      'yellow' => '1;33',
    ],
  ];

  echo sprintf(
    "%s%s%s%s\n",
    isset($colors['foreground'][$foregroundColor]) ? sprintf("\033[%sm", $colors['foreground'][$foregroundColor]) : '',
    isset($colors['background'][$backgroundColor]) ? sprintf("\033[%sm", $colors['background'][$backgroundColor]) : '',
    $text,
    NULL === $foregroundColor || NULL === $backgroundColor ? "\033[0m" : ''
  );
}

// Display help.
if (isset($argv[1]) && $argv[1] === '--help') {
  println(
<<<HELP
Mandatory arguments:
1) An xml destination file
2) At least one xml source file

Optional arguments that may be put after the mandatory arguments:
- Other xml source files
HELP
  );
  exit(0);
}

// Get files.
$files = array_values(array_filter($argv, function ($arg) {
  return '.xml' === substr($arg, -4);
}));

// Invalid files number.
if (count($files) < 2) {
  println('Invalid files number, at least 2 is needed.', 'red');
  exit(1);
}

// Get destination.
$destination = array_shift($files);

// Merge files.
$root = NULL;
foreach ($files as $file) {
  $document = new DOMDocument();
  $document->load($file);
  if (NULL === $root) {
    $root = $document;
    continue;
  }
  foreach ($document->firstChild->childNodes as $childNode) {
    $root->firstChild->appendChild($root->importNode($childNode, TRUE));
  }
}
$root->save($destination);

// Display result.
$limit = count($files) - 2;
foreach ($files as $index => $file) {
  if ($index > $limit) {
    break;
  }
  $suffix = $index < $limit ? ', ' : ' and ';
  $files[$index] = "$file$suffix";
}
println(sprintf(
  'XML aggregating %s was saved to %s.',
  implode($files),
  $destination
), 'green');