1--TEST-- 2Test mb_decode_mimeheader() function: use of underscores in QPrint-encoded data 3--EXTENSIONS-- 4mbstring 5--FILE-- 6<?php 7 8// RFC 2047 says that in a QPrint-encoded MIME encoded word, underscores should be converted to spaces 9var_dump(mb_decode_mimeheader("=?UTF-8?Q?abc?=")); 10var_dump(mb_decode_mimeheader("=?UTF-8?Q?abc_def?=")); 11var_dump(mb_decode_mimeheader("_=?UTF-8?Q?abc_def?=_")); 12var_dump(mb_decode_mimeheader("=?UTF-8?Q?__=E6=B1=89=E5=AD=97__?=")); 13 14// This is how underscores should be encoded in MIME encoded words with QPrint 15var_dump(mb_decode_mimeheader("=?UTF-8?Q?=5F?=")); 16 17?> 18--EXPECT-- 19string(3) "abc" 20string(7) "abc def" 21string(9) "_abc def_" 22string(10) " 汉字 " 23string(1) "_" 24