Windows版本的PHP具有對該擴展的內置支持。您無需加載任何其他擴展即可使用這些功能 此擴展提供的功能根據當前語言環境檢查字符或字符串是否屬于某個字符類 * [ctype\_alnum](https://www.php.net/manual/en/function.ctype-alnum.php)—檢查字母數字字符 * [ctype\_alpha](https://www.php.net/manual/en/function.ctype-alpha.php)—檢查字母字符 * [ctype\_cntrl](https://www.php.net/manual/en/function.ctype-cntrl.php)—檢查控制字符 * [ctype\_digit](https://www.php.net/manual/en/function.ctype-digit.php)—檢查數字字符 * [ctype\_graph](https://www.php.net/manual/en/function.ctype-graph.php)—檢查除空格以外的任何可打印字符 * [ctype\_lower](https://www.php.net/manual/en/function.ctype-lower.php)—檢查小寫字符 * [ctype\_print](https://www.php.net/manual/en/function.ctype-print.php)—檢查可打印字符 * [ctype\_punct](https://www.php.net/manual/en/function.ctype-punct.php)—檢查是否有任何非空格或字母數字字符的可打印字符 * [ctype\_space](https://www.php.net/manual/en/function.ctype-space.php)—檢查空格字符 * [ctype\_upper](https://www.php.net/manual/en/function.ctype-upper.php)—檢查大寫字符 * [ctype\_xdigit](https://www.php.net/manual/en/function.ctype-xdigit.php)—檢查表示一個十六進制數字的字符