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ctype_alnum »
« 预定义常量
PHP 手册
函数参考
变量与类型相关扩展
Ctype
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Ctype 函数
目录
ctype_alnum
— 检测字母数字式字符
ctype_alpha
— 检测字母字符
ctype_cntrl
— 检测控制字符
ctype_digit
— 检测数字字符
ctype_graph
— 检测除空格外的任何打印字符
ctype_lower
— 检测小写字符
ctype_print
— 检测可打印字符
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
— 检测空白字符
ctype_upper
— 检测大写字符
ctype_xdigit
— 检测字符是否只包含十六进制字符
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