*mbstring*提供了針對多字節字符串的函數，能夠幫你處理 PHP 中的多字節編碼。 除此以外，*mbstring*還能在可能的字符編碼之間相互進行編碼轉換。 為了方便起見，*mbstring*設計成了處理基于 Unicode 的編碼，類似 UTF-8、UCS-2 及諸多單字節的編碼（在以下列出了）。 需要手動開啟 以下是涉及到*mbstring*的相關配置選項。 * **\--enable-mbstring**：激活*mbstring*函數。 要使用*mbstring*函數必須啟用這個選項。 libmbfl對*mbstring*是必要的。libmbfl被捆綁到了*mbstring*。 如果系統已安裝libmbfl，**\--with-libmbfl\[=DIR\]**可以指定使用已安裝的庫。 * **\--disable-mbregex**：禁用正則表達式函數中多字節字符的支持。 * [預定義常量](https://www.php.net/manual/zh/mbstring.constants.php) * [支持編碼的摘要](https://www.php.net/manual/zh/mbstring.encodings.php) * [日文字符多字節編碼基礎](https://www.php.net/manual/zh/mbstring.ja-basic.php) * [HTTP 輸入和輸出](https://www.php.net/manual/zh/mbstring.http.php) * [支持的字符編碼](https://www.php.net/manual/zh/mbstring.supported-encodings.php) * [函數重載功能](https://www.php.net/manual/zh/mbstring.overload.php) * [PHP字符編碼的要求](https://www.php.net/manual/zh/mbstring.php4.req.php) * [多字節字符串 函數](https://www.php.net/manual/zh/ref.mbstring.php) * [mb\_check\_encoding](https://www.php.net/manual/zh/function.mb-check-encoding.php)— 檢查字符串在指定的編碼里是否有效 * [mb\_chr](https://www.php.net/manual/zh/function.mb-chr.php)— Get a specific character * [mb\_convert\_case](https://www.php.net/manual/zh/function.mb-convert-case.php)— 對字符串進行大小寫轉換 * [mb\_convert\_encoding](https://www.php.net/manual/zh/function.mb-convert-encoding.php)— 轉換字符的編碼 * [mb\_convert\_kana](https://www.php.net/manual/zh/function.mb-convert-kana.php)— Convert "kana" one from another ("zen-kaku", "han-kaku" and more) * [mb\_convert\_variables](https://www.php.net/manual/zh/function.mb-convert-variables.php)— 轉換一個或多個變量的字符編碼 * [mb\_decode\_mimeheader](https://www.php.net/manual/zh/function.mb-decode-mimeheader.php)— 解碼 MIME 頭字段中的字符串 * [mb\_decode\_numericentity](https://www.php.net/manual/zh/function.mb-decode-numericentity.php)— 根據 HTML 數字字符串解碼成字符 * [mb\_detect\_encoding](https://www.php.net/manual/zh/function.mb-detect-encoding.php)— 檢測字符的編碼 * [mb\_detect\_order](https://www.php.net/manual/zh/function.mb-detect-order.php)— 設置/獲取 字符編碼的檢測順序 * [mb\_encode\_mimeheader](https://www.php.net/manual/zh/function.mb-encode-mimeheader.php)— 為 MIME 頭編碼字符串 * [mb\_encode\_numericentity](https://www.php.net/manual/zh/function.mb-encode-numericentity.php)— Encode character to HTML numeric string reference * [mb\_encoding\_aliases](https://www.php.net/manual/zh/function.mb-encoding-aliases.php)— Get aliases of a known encoding type * [mb\_ereg\_match](https://www.php.net/manual/zh/function.mb-ereg-match.php)— Regular expression match for multibyte string * [mb\_ereg\_replace\_callback](https://www.php.net/manual/zh/function.mb-ereg-replace-callback.php)— Perform a regular expression search and replace with multibyte support using a callback * [mb\_ereg\_replace](https://www.php.net/manual/zh/function.mb-ereg-replace.php)— Replace regular expression with multibyte support * [mb\_ereg\_search\_getpos](https://www.php.net/manual/zh/function.mb-ereg-search-getpos.php)— Returns start point for next regular expression match * [mb\_ereg\_search\_getregs](https://www.php.net/manual/zh/function.mb-ereg-search-getregs.php)— Retrieve the result from the last multibyte regular expression match * [mb\_ereg\_search\_init](https://www.php.net/manual/zh/function.mb-ereg-search-init.php)— Setup string and regular expression for a multibyte regular expression match * [mb\_ereg\_search\_pos](https://www.php.net/manual/zh/function.mb-ereg-search-pos.php)— Returns position and length of a matched part of the multibyte regular expression for a predefined multibyte string * [mb\_ereg\_search\_regs](https://www.php.net/manual/zh/function.mb-ereg-search-regs.php)— Returns the matched part of a multibyte regular expression * [mb\_ereg\_search\_setpos](https://www.php.net/manual/zh/function.mb-ereg-search-setpos.php)— Set start point of next regular expression match * [mb\_ereg\_search](https://www.php.net/manual/zh/function.mb-ereg-search.php)— Multibyte regular expression match for predefined multibyte string * [mb\_ereg](https://www.php.net/manual/zh/function.mb-ereg.php)— Regular expression match with multibyte support * [mb\_eregi\_replace](https://www.php.net/manual/zh/function.mb-eregi-replace.php)— Replace regular expression with multibyte support ignoring case * [mb\_eregi](https://www.php.net/manual/zh/function.mb-eregi.php)— Regular expression match ignoring case with multibyte support * [mb\_get\_info](https://www.php.net/manual/zh/function.mb-get-info.php)— 獲取 mbstring 的內部設置 * [mb\_http\_input](https://www.php.net/manual/zh/function.mb-http-input.php)— 檢測 HTTP 輸入字符編碼 * [mb\_http\_output](https://www.php.net/manual/zh/function.mb-http-output.php)— 設置/獲取 HTTP 輸出字符編碼 * [mb\_internal\_encoding](https://www.php.net/manual/zh/function.mb-internal-encoding.php)— 設置/獲取內部字符編碼 * [mb\_language](https://www.php.net/manual/zh/function.mb-language.php)— 設置/獲取當前的語言 * [mb\_list\_encodings](https://www.php.net/manual/zh/function.mb-list-encodings.php)— 返回所有支持編碼的數組 * [mb\_ord](https://www.php.net/manual/zh/function.mb-ord.php)— Get code point of character * [mb\_output\_handler](https://www.php.net/manual/zh/function.mb-output-handler.php)— 在輸出緩沖中轉換字符編碼的回調函數 * [mb\_parse\_str](https://www.php.net/manual/zh/function.mb-parse-str.php)— 解析 GET/POST/COOKIE 數據并設置全局變量 * [mb\_preferred\_mime\_name](https://www.php.net/manual/zh/function.mb-preferred-mime-name.php)— 獲取 MIME 字符串 * [mb\_regex\_encoding](https://www.php.net/manual/zh/function.mb-regex-encoding.php)— Set/Get character encoding for multibyte regex * [mb\_regex\_set\_options](https://www.php.net/manual/zh/function.mb-regex-set-options.php)— Set/Get the default options for mbregex functions * [mb\_scrub](https://www.php.net/manual/zh/function.mb-scrub.php)— Description * [mb\_send\_mail](https://www.php.net/manual/zh/function.mb-send-mail.php)— 發送編碼過的郵件 * [mb\_split](https://www.php.net/manual/zh/function.mb-split.php)— 使用正則表達式分割多字節字符串 * [mb\_str\_split](https://www.php.net/manual/zh/function.mb-str-split.php)— Given a multibyte string, return an array of its characters * [mb\_strcut](https://www.php.net/manual/zh/function.mb-strcut.php)— 獲取字符的一部分 * [mb\_strimwidth](https://www.php.net/manual/zh/function.mb-strimwidth.php)— 獲取按指定寬度截斷的字符串 * [mb\_stripos](https://www.php.net/manual/zh/function.mb-stripos.php)— 大小寫不敏感地查找字符串在另一個字符串中首次出現的位置 * [mb\_stristr](https://www.php.net/manual/zh/function.mb-stristr.php)— 大小寫不敏感地查找字符串在另一個字符串里的首次出現 * [mb\_strlen](https://www.php.net/manual/zh/function.mb-strlen.php)— 獲取字符串的長度 * [mb\_strpos](https://www.php.net/manual/zh/function.mb-strpos.php)— 查找字符串在另一個字符串中首次出現的位置 * [mb\_strrchr](https://www.php.net/manual/zh/function.mb-strrchr.php)— 查找指定字符在另一個字符串中最后一次的出現 * [mb\_strrichr](https://www.php.net/manual/zh/function.mb-strrichr.php)— 大小寫不敏感地查找指定字符在另一個字符串中最后一次的出現 * [mb\_strripos](https://www.php.net/manual/zh/function.mb-strripos.php)— 大小寫不敏感地在字符串中查找一個字符串最后出現的位置 * [mb\_strrpos](https://www.php.net/manual/zh/function.mb-strrpos.php)— 查找字符串在一個字符串中最后出現的位置 * [mb\_strstr](https://www.php.net/manual/zh/function.mb-strstr.php)— 查找字符串在另一個字符串里的首次出現 * [mb\_strtolower](https://www.php.net/manual/zh/function.mb-strtolower.php)— 使字符串小寫 * [mb\_strtoupper](https://www.php.net/manual/zh/function.mb-strtoupper.php)— 使字符串大寫 * [mb\_strwidth](https://www.php.net/manual/zh/function.mb-strwidth.php)— 返回字符串的寬度 * [mb\_substitute\_character](https://www.php.net/manual/zh/function.mb-substitute-character.php)— 設置/獲取替代字符 * [mb\_substr\_count](https://www.php.net/manual/zh/function.mb-substr-count.php)— 統計字符串出現的次數 * [mb\_substr](https://www.php.net/manual/zh/function.mb-substr.php)— 獲取部分字符串