3v4l.org

run code in 300+ PHP versions simultaneously
<?php var_dump( mb_convert_encoding( $bin = hex2bin("5c") . "\\", "UTF-8", "SJIS" ), mb_check_encoding($bin, "SJIS"), bin2hex($bin) );
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.8 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14
string(2) "\\" bool(true) string(4) "5c5c"
Output for 8.1.0 - 8.1.7
string(4) "¥¥" bool(true) string(4) "5c5c"
preferences:
106.85 ms | 407 KiB | 5 Q