Parsing basic Jekyll format in PHP

parse.php

<?php

// Note, you need symfony/yaml to parse the Front Matter
if ( ! Input::hasFile('file'))
{
	// Do some fail here
	return;
}

$contents = trim(File::get(Input::file('file')->getRealPath()));

if (substr($contents, 0, 3) !== '---')
{
	throw new Exception('Bad Formatting');
}

if ( ! ($pos = strpos($contents, '---', 3)))
{
	throw new Exception('Bad Formatting');
}
$frontMatter = trim(substr($contents, 3, $pos - 3));
$contents = trim(substr($contents, $pos + 3));

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

$fields = $yaml->parse($frontMatter);