Example usage Symfony Yaml custom tags

yaml-custom-tags.php

<?php

require 'vendor/autoload.php';

$parsed = \Symfony\Component\Yaml\Yaml::parse(<<<YAML

test:
  a: !b64baby stuff
  b: foo
YAML
, \Symfony\Component\Yaml\Yaml::PARSE_CUSTOM_TAGS);

array_walk_recursive($parsed, function(&$value) {
    if ($value instanceof \Symfony\Component\Yaml\Tag\TaggedValue && $value->getTag() === 'b64baby') {
        $value = base64_encode($value->getValue());
    }
});

print_r($parsed);