PHP: Renaming part of a filename in a directory?

Question

PHP

People! Can you please tell
me How can I use a script to rename crooked file names to normal ones in a directory?
On the hosting, the files are with names like: #U0411#U0430#U043b#U0430#U043d#U0441_#U043d#U0430_01012017.pdf
And it should be: Balance_on_01012017.pdf You
need a php script that will rename all files in the directory to normal.
How can this be done better?

Answer 1

Autocorrect + copy-paste from the manual =

tyts

<?php

$badname = "#U0411#U0430#U043b#U0430#U043d#U0441_#U043d#U0430_01012017.pdf";
$converted = preg_replace('/#U([0-9a-f]{1,4})/', '&#x${1};', $badname);
echo preg_replace_callback('/&#([0-9a-fx]+);/mi', 'replace_num_entity', $converted);


function replace_num_entity($ord)
{
    $ord = $ord[1];
    if (preg_match('/^x([0-9a-f]+)$/i', $ord, $match))
    {
        $ord = hexdec($match[1]);
    }
    else
    {
        $ord = intval($ord);
    }
    
    $no_bytes = 0;
    $byte = array();

    if ($ord < 128)
    {
        return chr($ord);
    }
    elseif ($ord < 2048)
    {
        $no_bytes = 2;
    }
    elseif ($ord < 65536)
    {
        $no_bytes = 3;
    }
    elseif ($ord < 1114112)
    {
        $no_bytes = 4;
    }
    else
    {
        return;
    }

    switch($no_bytes)
    {
        case 2:
        {
            $prefix = array(31, 192);
            break;
        }
        case 3:
        {
            $prefix = array(15, 224);
            break;
        }
        case 4:
        {
            $prefix = array(7, 240);
        }
    }

    for ($i = 0; $i < $no_bytes; $i++)
    {
        $byte[$no_bytes - $i - 1] = (($ord & (63 * pow(2, 6 * $i))) / pow(2, 6 * $i)) & 63 | 128;
    }

    $byte[0] = ($byte[0] & $prefix[0]) | $prefix[1];

    $ret = '';
    for ($i = 0; $i < $no_bytes; $i++)
    {
        $ret .= chr($byte[$i]);
    }

    return $ret;
}

demo
You can use DirectoryIterator to traverse the folder , or just plain old glob() + foreach.

Answer 2

Thanks, it helped! Here is the solution code:

<?
header("Content-Type: text/html; charset=utf-8");


Echo "Текущая кодировка:&nbsp;" . mb_internal_encoding(); ?> </br> <?

$ArrDir = glob("*.*");                                   //соберем файлы в текущей директории в массив

Echo "<b>Файлы в директории запуска скрипта:</b></br>";

foreach ($ArrDir as $key => $value) 
{
Echo "Ключ:&nbsp;{$key} => Значение:&nbsp;{$value}</br> "; 
}
             

Echo "<hr><b>Переменование битых имен файлов</b></br><hr>";

foreach($ArrDir as $name)
{
   Echo  "Имя файла до: $name</br>";  
 
   $name_decoded = preg_replace_callback('/[#_]u([0-9a-fA-F]{4})/i', function ($match) {
       return mb_convert_encoding(pack('H*', $match[1]), 'UTF-8', 'UCS-2BE');
       }, $name);

   Echo  "Имя файла после: $name_decoded</br><hr>";  

rename($name, $name_decoded);  

}

?>