Online PHP editor | output for QZntM

<?php $icelandic = array( 'jan' => 'January', 'feb' => 'February', 'mar' => 'March', 'apr' => 'April', 'maí' => 'May', 'jún' => 'June', 'júl' => 'July', 'ágú' => 'August', 'okt' => 'October', 'sep' => 'September', 'nóv' => 'November', 'des' => 'December', ); $tests = array( '1. júní 2018 04:53', '2. Ágú 2018 04:53', '3. Maí 2018 04:53', '4. nóvember 2018 04:53', '5. Des 2018 04:53' ); foreach ($tests as $test) { echo "\n$test -> "; echo preg_replace_callback('~(' . implode('|', array_keys($icelandic)) . ')\pL*~iu', function($m)use($icelandic) { return $icelandic[mb_strtolower($m[1], 'UTF-8')]; }, $test); }