ctype(category17-virtuelle-server.html) - phpMan

ctype.h (0p)         - character types
iswctype (3)         - wide-character classification
iswctype (3p)        - test character for a specified class
wctype (3)           - wide-character classification
wctype (3p)          - define character class
wctype.h (0p)        - wide-character classification and mapping utilities