PHP编码转换函数

1.

gb2312转换成utf-8
$utf=iconv('GB2312', 'UTF-8', $string);

 

2.

mb_convert_encoding() 函数

Description string mb_convert_encoding ( string str, string to-encoding [, mixed from-encoding])/* Convert internal character encoding to SJIS */$str = mb_convert_encoding($str, "SJIS");/* Auto detect encoding from JIS, eucjp-win, sjis-win, then convert str to UCS-2LE */$str = mb_convert_encoding($str, "UCS-2LE", "JIS, eucjp-win, sjis-win");/* "auto" is expanded to "ASCII,JIS,UTF-8,EUC-JP,SJIS" */$str = mb_convert_encoding($str, "EUC-JP", "auto");

注意：但是需要先enable mbstring 扩展库。两者区别：mb_convert_encoding 中根据内容自动识别编码；mb_convert_encoding功能强大，但是执行效率比iconv差太多；
总结：一般情况下用 iconv，只有当遇到无法确定原编码是何种编码时才用 mb_convert_encoding 函数.

 

3.

<?php echo base64_encode($str)."<br />"; //加密 $ss='Z25pZD0yNSZncGljaT0x'; echo base64_decode($ss); //解密?>