字符类型检测
- 简介
- 安装／配置
- 预定义常量
- Ctype 函数
- ctype_alnum — 做字母和数字字符检测
- ctype_alpha — 做纯字符检测
- ctype_cntrl — 做控制字符检测
- ctype_digit — 做纯数字检测
- ctype_graph — 做可打印字符串检测，空格除外
- ctype_lower — 做小写字符检测
- ctype_print — 做可打印字符检测
- ctype_punct — 检测可打印的字符是不是不包含空白、数字和字母
- ctype_space — 做空白字符检测
- ctype_upper — 做大写字母检测
- ctype_xdigit — 检测字符串是否只包含十六进制字符
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