php man page for btowc

BTOWC(3)						     Linux Programmer's Manual							  BTOWC(3)

NAME
       btowc - convert single byte to wide character

SYNOPSIS
       #include <wchar.h>

       wint_t btowc(int c);

DESCRIPTION
       The  btowc() function converts c, interpreted as a multibyte sequence of length 1, starting in the initial shift state, to a wide character
       and returns it.	If c is EOF or not a valid multibyte sequence of length 1, the btowc() function returns WEOF.

RETURN VALUE
       The btowc() function returns the wide character converted from the single byte c.  If c is EOF or not a valid multibyte sequence of  length
       1, it returns WEOF.

ATTRIBUTES
       For an explanation of the terms used in this section, see attributes(7).

       +----------+---------------+---------+
       |Interface | Attribute	  | Value   |
       +----------+---------------+---------+
       |btowc()   | Thread safety | MT-Safe |
       +----------+---------------+---------+
CONFORMING TO
       POSIX.1-2001, POSIX.1-2008, C99.

NOTES
       The behavior of btowc() depends on the LC_CTYPE category of the current locale.

       This  function  should  never  be used.	It does not work for encodings which have state, and unnecessarily treats single bytes differently
       from multibyte sequences.  Use either mbtowc(3) or the thread-safe mbrtowc(3) instead.

SEE ALSO
       mbrtowc(3), mbtowc(3), wctob(3)

COLOPHON
       This page is part of release 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and  the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

GNU
								    2015-08-08								  BTOWC(3)