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run code in 200+ php & hhvm versions

@

<?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;
                }
            }
        });

eol versions

Output for 7.1.0 - 7.2.0: Warning: preg_replace_callback(): Requires argument 2, 'äöüÄÖÜß', to be a valid callback in /in/jsCZq on line 29 Recoverable fatal error: Object of class Closure could not be converted to string in /in/jsCZq on line 29
Process exited with code 255.
Output for 5.3.20 - 7.0.20: Warning: preg_replace_callback(): Requires argument 2, 'äöüÄÖÜß', to be a valid callback in /in/jsCZq on line 29 Catchable fatal error: Object of class Closure could not be converted to string in /in/jsCZq on line 29
Process exited with code 255.