函数接口如下(返回值都是bool值):
//判断text是否由数字或字母组成function ctype_alnum ($text) {}//判断text是否全由字母组成function ctype_alpha ($text) {}//判断text是否都由控制字符(例:换行[nr]、缩进[t]、空格[])组成function ctype_cntrl ($text) {}//判断text是否都由小写字符组成function ctype_lower ($text) {}//判断text是否都由数组组成function ctype_digit ($text) {}//判断text是否都由标点符号组成function ctype_punct ($text) {}//监测text是否都由空白字符组成,包括缩进,换行,空白function ctype_space ($text) {}//判断text是否都由大写字符组成function ctype_upper ($text) {}