PHP: Parsing YAML Frontmatter

frontmatter.php

<?php

# 10,000 iterations in 1.9696619510651s
function frontMatterExplode($str)
{
  $lines = explode(PHP_EOL, $str);
  if (rtrim($lines[0]) === '---') {
    unset($lines[0]);
    $i = 1;
    $yaml = array();
    foreach ($lines as $line) {
      if (rtrim($line) === '---') {
        break;
      }
      $yaml[] = $line;
      $i++;
    }
    $yaml = implode(PHP_EOL, $yaml);
    $content = implode(PHP_EOL, array_slice($lines, $i));
    return array(trim($yaml), trim($content));
  }
  return array('', $str);
}

# 10,000 iterations in 3.0784578323364s
function frontMatterRegex($str)
{
  $matches = array();
  if (preg_match('/^---\s*\n(.*?)\n---\s*\n(.*?)$/s', $str, $matches)) {
    return array(trim($matches[1]), trim($matches[2]));
  }
  return array('', $str);
}