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@ 2015-11-30T12:53:09Z

<?php

        echo preg_replace_callback('/(ä)|(ö)|(ü)|(Ä)|(Ö)|(Ü)|(ß)/', 'äöüÄÖÜß', function($matches){
            foreach($matches as &$match){
                switch($match){
                    case 'ü':
                        $match = 'ue';
                        break;
                    case 'ö':
                        $match = 'oe';
                        break;
                    case 'ä':
                        $match = 'ae';
                        break;
                    case 'Ü':
                        $match = 'Ue';
                        break;
                    case 'Ö':
                        $match = 'Oe';
                        break;
                    case 'Ä':
                        $match = 'Ae';
                        break;
                    case 'ß':
                        $match = 'ss';
                        break;
                }
            }
        });

preg_replace_callback: documentation ( source)

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