<?php
$s = mb_convert_encoding('\\', 'UTF-8', 'SJIS-win');
var_dump(bin2hex($s));
// string(2) "5c"
$s = iconv('Shift_JIS', 'utf-8', '\\');
var_dump(bin2hex($s));
// string(4) "c2a5"
$s = iconv('windows-31j', 'utf-8', '\\');
var_dump(bin2hex($s));
// string(2) "5c"
$s = iconv('cp932', 'utf-8', '\\');
var_dump(bin2hex($s));
// string(2) "5c"
$s = mb_convert_encoding('~', 'UTF-8', 'SJIS-win');
var_dump(bin2hex($s));
// string(2) "7e"
$s = iconv('Shift_JIS', 'utf-8', '~');
var_dump(bin2hex($s));
// string(6) "e280be"
$s = iconv('windows-31j', 'utf-8', '~');
var_dump(bin2hex($s));
// string(2) "7e"
$s = iconv('cp932', 'utf-8', '~');
var_dump(bin2hex($s));
// string(2) "7e"
preferences:
32.38 ms | 402 KiB | 5 Q