3v4l.org

run code in 300+ PHP versions simultaneously
<?php var_dump( $conv = mb_convert_encoding( $bin = hex2bin("fe7ff9cb"), "UTF-8", "CP936" ), mb_check_encoding($bin, "CP936"), bin2hex(mb_convert_encoding($conv, "CP936", "UTF-8")) );
preferences:
27.3 ms | 408 KiB | 5 Q