Transcode, translate UTF-8 string with chars from windows encoding to another windows encoding

transcode.sh

#!/usr/bin/env php
<?php

function transCode($sourceStringArray, $sourceMap, $targetMap) {
    $newString = [];

    foreach ($sourceStringArray as $index => $char) {
        if ($char == ' ') {
            $newString[] = $char;
            continue;
        }
        $sourceIndex = array_search($char, $sourceMap);
        $targetIndex = isset($targetMap[$sourceIndex]) && !empty($targetMap[$sourceIndex]) ? $sourceIndex : false;
        $newString[] = $targetIndex === false ? $char : $targetMap[$targetIndex];
    }

    return implode($newString);
}

function mbStringToArray($string) {
    $strlen = mb_strlen($string);
    while ($strlen) {
        $array[] = mb_substr($string, 0, 1, "UTF-8");
        $string  = mb_substr($string, 1, $strlen, "UTF-8");
        $strlen  = mb_strlen($string);
    }

    return $array;
}

$enc = [
    '1250'    => 'ŕáâăäĺćçčéęëěíîďđńňóôőö÷řůúűüýţ˙',
    '1250_up' => 'ŔÁÂĂÄĹĆÇČÉĘËĚÍÎĎĐŃŇÓÔŐÖ×ŘŮÚŰÜÝŢß',
    
    '1251'    => 'абвгдежзийклмнопрстуфхцчшщъыьэюя',
    '1251_up' => 'АБВГДЕЖЗИЙКЛМНОПРСТУФХЦЧШЩЪЫЬЭЮЯ',

    '1252'    => 'àáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþÿ',
    '1252_up' => 'ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞß',
    
    '1253'    => 'ΰαβγδεζηθικλμνξοπρςστυφχψωϊϋόύώ ',
    '1253_up' => 'ΐΑΒΓΔΕΖΗΘΙΚΛΜΝΞΟΠΡ ΣΤΥΦΧΨΩΪΫάέήί',
    
    '1254'    => 'àáâãäåæçèéêëìíîïğñòóôõö÷øùúûüışÿ',
    '1254_up' => 'ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏĞÑÒÓÔÕÖ×ØÙÚÛÜİŞß',
    
    '1255'    => 'אבגדהוזחטיךכלםמןנסעףפץצקרשת',
    '1255_up' => 'ְֱֲֳִֵֶַָֹֺֻּֽ־ֿ׀ׁׂ׃װױײ׳״        ',
    // TODO add hebrew up and 1256-8
];

if ($argc < 2 || $argv == '--test') {
    exit('You need to provide a string');
}

$test = array_search('--test', $argv);
if ($test !== false) {
    unset($argv[$test]);
    $argc = count($argv);
}

$sourceString = $argv[1];
$sourceStringArray = mbStringToArray($sourceString);

$sourceEncoding = $argc > 2 && intval($argv[2]) == $argv[2] ? $argv[2] : 1250;
if (!isset($enc[$sourceEncoding])) {
    exit('No such encoding: ' . $sourceEncoding);
}
$sourceEncodingArray = mbStringToArray($enc[$sourceEncoding]);

$targetEncoding = $argc > 3 && intval($argv[3]) == $argv[3] ? $argv[3] : 1255;
if (!isset($enc[$targetEncoding])) {
    exit('No such encoding: ' . $targetEncoding);
}
$targetEncodingArray = mbStringToArray($enc[$targetEncoding]);

if ($test) {
    foreach ($enc as $code => $mapString) {
        if ($code == $sourceEncoding) {
            continue;
        }
        echo str_pad($code . ':', 10, ' ', STR_PAD_RIGHT), transCode($sourceStringArray, mbStringToArray($mapString), $targetEncodingArray), "\n";
    }
} else {
    echo transCode($sourceStringArray, $sourceEncodingArray, $targetEncodingArray), "\n";
}