ctype_space check for whitespace character
『网络技术』-php正则判断必须是字母或数字的组合... ... ctype_upper():check for uppercase character(s)//检查是否是大写字母 ctype_space: check for whitespace character(s)//是否是空白字符 ctype_xdigit: check for character(s) representing a hexadecimal digit//检查是否是十六进制数字 ...
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