Online PHP editor | refs for Cf6Nh

<?php $corrupted = <<<STRING a:4:{i:0;s:3:"three";i:1;s:5:"five";i:2;s:2:"newline1 newline2";i:3;s:6:"garçon";} STRING; echo $corrupted; echo "\n---\n"; echo "fails to allow newline characers:\n"; var_export(unserialize(preg_replace_callback('!s:(\d+):"(.*?)";!', function($m) { return 's:'.mb_strlen($m[2]).':"'.$m[2].'";'; }, $corrupted))); echo "\n\nfails to appropriately count bytes:\n"; var_export(unserialize(preg_replace_callback('!s:(\d+):"(.*?)";!s', function($m) { return 's:'.mb_strlen($m[2]).':"'.$m[2].'";'; }, $corrupted))); echo"\n---\n"; echo "USE THIS PATTERN WITH THIS REPLACEMENT:\n"; var_export(preg_replace_callback( '/s:\d+:"(.*?)";/s', function ($m) { return "s:" . strlen($m[1]) . ":\"{$m[1]}\";"; }, $corrupted ));