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@ 2018-07-30T07:07:53Z

<?php


$a='ŠŒŽšœžŸ¥µÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖØÙÚÛÜÝßàáâãäåæçèéêëìíîïðñòóôõöøùúûüýÿ';

var_dump(mb_strtolower($a));
$from=['Š','Œ','Ž','š','œ','ž','Ÿ','¥','µ','À','Á','Â','Ã','Ä','Å','Æ','Ç','È','É','Ê','Ë','Ì','Í','Î','Ï','Ð','Ñ','Ò','Ó','Ô','Õ','Ö','Ø','Ù','Ú','Û','Ü','Ý','ß','à','á','â','ã','ä','å','æ','ç','è','é','ê','ë','ì','í','î','ï','ð','ñ','ò','ó','ô','õ','ö','ø','ù','ú','û','ü','ý','ÿ'];
$to=  ['S','O','Z','s','o','z','Y','Y','u','A','A','A','A','A','A','A','C','E','E','E','E','I','I','I','I','D','N','O','O','O','O','O','O','U','U','U','U','Y','s','a','a','a','a','a','a','a','c','e','e','e','e','i','i','i','i','o','n','o','o','o','o','o','o','u','u','u','u','y','y'];


$a=str_replace(
    $from,
    $to,
    $a
    );

$a=strtolower($a);
var_dump($a);

Output for 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6: string(138) "šœžšœžÿ¥µàáâãäåæçèéêëìíîïðñòóôõöøùúûüýßàáâãäåæçèéêëìíîïðñòóôõöøùúûüýÿ" string(69) "sozsozyyuaaaaaaaceeeeiiiidnoooooouuuuysaaaaaaaceeeeiiiionoooooouuuuyy"
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 string(138) "šœžšœžÿ¥µàáâãäåæçèéêëìíîïðñòóôõöøùúûüýßàáâãäåæçèéêëìíîïðñòóôõöøùúûüýÿ" string(69) "sozsozyyuaaaaaaaceeeeiiiidnoooooouuuuysaaaaaaaceeeeiiiionoooooouuuuyy"

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