This is a PHP port of the python module for writing pandoc filters found at https://github.com/jgm/pandocfilters
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README.md
pandocfilters.php

README.md

PHP pandocfilters

This is a PHP port of the python module for writing pandoc filters found at https://github.com/jgm/pandocfilters

The purpose is simply to make it easier to write filters in PHP

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

require_once __DIR__ . '/../pandocfilters.php';

Pandoc_Filter::toJSONFilter(function ($type, $value, $format, $meta) {
    if ('Str' == $type) {
        // use mb_convert_case instead of ucwords so filter works with unicode
        return mb_convert_case($value, MB_CASE_TITLE, "UTF-8");
    }
});

More examples and more information can be found in the original repository. Dave Jarvis has opened a PR with a bit more information. Until it is merged it can be found here:
https://github.com/DaveJarvis/pandocfilters/tree/patch-1

Thanks to John MacFarlane for pandoc.