Symfony YAML vs. Spyc YAML vs. JSON vs. PHP parsing times.

format_benchmarks.php

<?php

require_once __DIR__ . '/core/vendor/autoload.php';
require_once __DIR__ . '/core/includes/bootstrap.inc';
drupal_bootstrap(DRUPAL_BOOTSTRAP_CODE);

$yaml_files = file_scan_directory('./test_yaml', '/\.yml$/');

$start = microtime(TRUE);
$yaml_contents = array();

$parser = new Symfony\Component\Yaml\Parser();

foreach ($yaml_files as $file) {
  $symfony_yaml[$file->name] = $parser->parse(file_get_contents($file->uri));

  // Convert YAML to identical JSON copies of the same files.
  //$json_version = json_encode($symfony_yaml[$file->name]);
  //$file_name = str_replace('.yml', '.json', str_replace('_yaml', '_json', $file->uri));
  //file_put_contents($file_name, json_encode($symfony_yaml[$file->name]));

  // Convert YAML to identical PHP copies of the same files.
//   $function_name = str_replace(array('.', '-'), '_', str_replace('.yml', '', $file->name));
//   $php_version = '<?php
// function ' . $function_name . '_value() {
//   return ' . var_export($spyc_yaml[$file->name], TRUE) . ';
// }';
//   $file_name = str_replace('.yml', '.php', str_replace('_yaml', '_php', $file->uri));
//   file_put_contents($file_name, $php_version);
}
$total = microtime(TRUE) - $start;
print "Symfony YAML parsing time: $total<br />";

// -----------------------------------------------------------------------------

$start = microtime(TRUE);
$yaml_contents = array();
require_once __DIR__ . '/spyc/Spyc.php';
foreach ($yaml_files as $file) {
  $spyc_yaml[$file->name] = spyc_load_file($file->uri);
}
$total = microtime(TRUE) - $start;
print "Spyc YAML parsing time: $total<br />";

// foreach ($symfony_yaml as $filename => $result) {
//   if ($spyc_yaml[$filename] != $result) {
//     print "$filename is different<br />";
//     print_r($result);
//     print "<br />";
//     print_r($spyc_yaml[$filename]);
//     print "<br />";
//   }
// }

// -----------------------------------------------------------------------------

$json_files = file_scan_directory('./test_json', '/\.json$/');
$start = microtime(TRUE);
$json_contents = array();
foreach ($json_files as $file) {
  $json_results[$file->name] = json_decode(file_get_contents($file->uri), TRUE);
}
$total = microtime(TRUE) - $start;
print "JSON parsing time: $total<br />";

foreach ($symfony_yaml as $filename => $result) {
  if ($json_results[$filename] != $result) {
    print "$filename is different<br />";
    print_r($result);
    print "<br />";
    print_r($json_results[$filename]);
    print "<br />";
  }
}

// -----------------------------------------------------------------------------

$php_files = file_scan_directory('./test_php', '/\.php$/');

$php_contents = array();
$start = microtime(TRUE);
foreach ($php_files as $file) {
  include_once($file->uri);
  $function_name = str_replace(array('.', '-'), '_', str_replace('.yml', '', $file->name)) . '_value';
  $php_contents[$file->name] = $function_name();
}
$total = microtime(TRUE) - $start;
print "PHP include and parsing time: $total<br />";

$php_contents2 = array();
$start = microtime(TRUE);
foreach ($php_files as $file) {
  $function_name = str_replace(array('.', '-'), '_', str_replace('.yml', '', $file->name)) . '_value';
  $php_contents2[$file->name] = $function_name();
}
$total = microtime(TRUE) - $start;
print "PHP parsing-only time: $total<br />";