string mb_convert_encoding ( string $str , string $to_encoding [, mixed $from_encoding = mb_internal_encoding() ] )//Converts the character encoding of string str to to_encoding from optionally from_encoding.

<?php/** * Created by PhpStorm. * User: zhangrongxiang * Date: 2018/1/28 * Time: 下午10:34 */$str = "Hello World\n";/* Convert internal character encoding to SJIS */$str = mb_convert_encoding( $str, "SJIS" );echo "1---" . $str; //1---Hello World$str = "Hello World\n";/* Convert EUC-JP to UTF-7 */$str = mb_convert_encoding( $str, "UTF-7", "EUC-JP" );echo "2---" . $str; //2---Hello World$str = "Hello World\n";/* 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" );echo "3---" . $str; //3---Hello World$str = "Hello World\n";/* "auto" is expanded to "ASCII,JIS,UTF-8,EUC-JP,SJIS" */$str = mb_convert_encoding( $str, "EUC-JP", "auto" );echo "4---" . $str; ///4---Hello World/**遍历字符集 */$text = "A strange string to pass, maybe with some ?, ?, ? characters. Hello 中国";foreach ( mb_list_encodings() as $chr ) { ???/**其他字符集转换成UTF-8输出*/ ???echo $chr . " ：" . mb_convert_encoding( $text, 'UTF-8', $chr ) . PHP_EOL; ???/**UTF-8转换成其他字符集输出*/ ???echo $chr . " ：" . mb_convert_encoding( $text, $chr, 'UTF-8' ) . PHP_EOL;}/**强制浏览器输出UTF-8编码字符串*/header( "content-Type: text/html; charset=Utf-8" );//在所有输出之前输出有效echo mb_convert_encoding( "你是我的好朋友", "UTF-8", "GBK" );/**支持的字符编码*///UCS-4*//UCS-4BE//UCS-4LE*//UCS-2//UCS-2BE//UCS-2LE//UTF-32*//UTF-32BE*//UTF-32LE*//UTF-16*//UTF-16BE*//UTF-16LE*//UTF-7//UTF7-IMAP//UTF-8*//ASCII*//EUC-JP*//SJIS*//eucJP-win*//SJIS-win*//ISO-2022-JP//ISO-2022-JP-MS//CP932//CP51932//SJIS-mac** (别名： MacJapanese)//SJIS-Mobile#DOCOMO** (别名： SJIS-DOCOMO)//SJIS-Mobile#KDDI** (别名： SJIS-KDDI)//SJIS-Mobile#SOFTBANK** (别名： SJIS-SOFTBANK)//UTF-8-Mobile#DOCOMO** (别名： UTF-8-DOCOMO)//UTF-8-Mobile#KDDI-A**//UTF-8-Mobile#KDDI-B** (别名： UTF-8-KDDI)//UTF-8-Mobile#SOFTBANK** (别名： UTF-8-SOFTBANK)//ISO-2022-JP-MOBILE#KDDI** (别名： ISO-2022-JP-KDDI)//JIS//JIS-ms//CP50220//CP50220raw//CP50221//CP50222//ISO-8859-1*//ISO-8859-2*//ISO-8859-3*//ISO-8859-4*//ISO-8859-5*//ISO-8859-6*//ISO-8859-7*//ISO-8859-8*//ISO-8859-9*//ISO-8859-10*//ISO-8859-13*//ISO-8859-14*//ISO-8859-15*//ISO-8859-16*//byte2be//byte2le//byte4be//byte4le//BASE64//HTML-ENTITIES//7bit//8bit//EUC-CN*//CP936//GB18030**//HZ//EUC-TW*//CP950//BIG-5*//EUC-KR*//UHC (CP949)//ISO-2022-KR//Windows-1251 (CP1251)//Windows-1252 (CP1252)//CP866 (IBM866)//KOI8-R*//KOI8-U*//ArmSCII-8 (ArmSCII8)// * 表示该编码也可以在正则表达式中使用。// ** 表示该编码自 PHP 5.4.0 始可用。//任何接受编码名称的 php.ini 条目同样也可以使用 "auto" 和 "pass" 的值。 接受编码名的 mbstring 函数同样也可以使用值 "auto"。//如果设置了 "pass"，将不会对字符的编码进行转化。//如果设置了 "auto"，它将扩展成 NLS 中定义的每个字符编码列表。 比如，假设 NLS 设置为 Japanese，值将会认为是 "ASCII,JIS,UTF-8,EUC-JP,SJIS"。