php编码转换函数(iconv mb_convert_encoding)
一般情况下用 iconv，只有当遇到无法确定原编码是何种编码，或iconv转化后无法正常显示时才用mb_convert_encoding 函数。
1，iconv函数语法 ：
echo iconv("ISO-8859-1", "UTF-8", "This is a test.");
?>
2，mb_convert_encoding函数语法 ：
<?php
/* Convert internal character encoding to SJIS */
$str = mb_convert_encoding($str, "SJIS");
/* Convert EUC-JP to UTF-7 */
$str = mb_convert_encoding($str, "UTF-7", "EUC-JP");
/* 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");
?>
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