3v4l.org

run code in 300+ PHP versions simultaneously
<?php var_dump( $conv = mb_convert_encoding( $bin = hex2bin("00"), "UTF-8", "UTF7-IMAP" ), mb_check_encoding($bin, "UTF7-IMAP"), bin2hex(mb_convert_encoding($conv, "UTF7-IMAP", "UTF-8")) );
Output for 8.1.0 - 8.1.27, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
string(1) "?" bool(false) string(2) "3f"
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30
string(1) "" bool(true) string(2) "00"
preferences:
119.19 ms | 401 KiB | 120 Q