eZ Publish search api example

searchapiexample.php

<?php

$contentTypes = array('article','blog_post');
$contentTypes = array('eng-GB','fin-FI');
$locationPath = '/2/30/44';

$query = new Query();
$query->filter = new Criterion\LogicalAnd(
    array(
        new Criterion\ContentTypeIdentifier($contentTypes),
        new Criterion\Subtree($locationPath),
        new Criterion\LanguageCode($languages),
    )
);

$query->sortClauses = array(
    new SortClause\DatePublished(),
);

$searchResults = $this->searchService->findContentInfo($query);

I think you meant $languages = array('eng-GB','fin-FI'); on line 4.