[3.1、utf8转gbk](3.1%E3%80%81utf8%E8%BD%ACgbk.md) [3.2、gbk转utf8](3.2%E3%80%81gbk%E8%BD%ACutf8.md) [3.3、繁体转简体](3.3%E3%80%81%E7%B9%81%E4%BD%93%E8%BD%AC%E7%AE%80%E4%BD%93.md) [3.4、简体转繁体](3.4%E3%80%81%E7%AE%80%E4%BD%93%E8%BD%AC%E7%B9%81%E4%BD%93.md) [3.5、unicode转utf8](3.5%E3%80%81unicode%E8%BD%ACutf8.md) [3.6、utf8转unicode](3.6%E3%80%81utf8%E8%BD%ACunicode.md) [3.7、Ascii转拼音](3.7%E3%80%81Ascii%E8%BD%AC%E6%8B%BC%E9%9F%B3.md) [3.8、gbk转拼音](3.8%E3%80%81gbk%E8%BD%AC%E6%8B%BC%E9%9F%B3.md) [3.9、数组 utf8转gbk](3.9%E3%80%81%E6%95%B0%E7%BB%84utf8%E8%BD%ACgbk.md) [3.10、数组 gbk转utf8](3.10%E3%80%81%E6%95%B0%E7%BB%84gbk%E8%BD%ACutf8.md) [3.11、json 处理gbk转码utf-8问题（ json_encode转换数组，值为null）](3.11%E3%80%81json%E5%A4%84%E7%90%86gbk%E8%BD%AC%E7%A0%81utf-8%E9%97%AE%E9%A2%98%EF%BC%88json_encode%E8%BD%AC%E6%8D%A2%E6%95%B0%E7%BB%84%EF%BC%8C%E5%80%BC%E4%B8%BAnull%EF%BC%89.md) [3.12、Unicode解码](3.12%E3%80%81Unicode%E8%A7%A3%E7%A0%81.md)