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@ 2017-09-28T10:51:01Z

<?php

function make_ascii($str) {
    //return $str;
    $special = array('ľ','š','č','ť','ž','ý','á','í','é','ú','ä','ô','ň','ě');
    $ascii =   array('l','s','c','t','z','y','a','i','e','u','a','o','n','e');
    $str = array_map(function ($i) use ($str) { 
    return mb_substr($str, $i, 1); 
}, range(0, mb_strlen($str) -1));
//$str = preg_split("//u",$str);
    foreach ($str as $k => $c) {
        if( mb_strtoupper($c, "UTF-8") == $c) {
            $u = true;
            $c = mb_strtolower($c);
        } else {
            $u = false;
        }
       // print_r($c);
        if(in_array($c, $special)) {
            $c = $ascii[array_search($c, $special)];
        }
        if($u) {
            $c = mb_strtoupper($c);
        }
        $str[$k] = $c;
    }
    return join($str);
}
$str = "ľÁľa ýellow";
var_dump(make_ascii($str));

Output for git.master, git.master_jit, rfc.property-hooks: string(11) "lAla yellow"

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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