3v4l.org

run code in 300+ PHP versions simultaneously
<?php var_dump( $conv = mb_convert_encoding( $bin = hex2bin("dc01d8020042"), "UTF-32", "UTF-16" ), mb_check_encoding($bin, "UTF-32"), bin2hex(mb_convert_encoding($conv, "UTF-16", "UTF-32")) );
Output for 8.1.0 - 8.1.13, 8.2rc1 - rc3
string(12) "??B" bool(false) string(12) "003f003f0042"
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.26
string(8) "?B" bool(false) string(8) "003f0042"

preferences:
41.22 ms | 921 KiB | 17 Q