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unary operators only operate on universal variables.
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byteorder(3) [php man page]

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

NAME
htonl, htons, ntohl, ntohs - convert values between host and network byte order SYNOPSIS
#include <arpa/inet.h> uint32_t htonl(uint32_t hostlong); uint16_t htons(uint16_t hostshort); uint32_t ntohl(uint32_t netlong); uint16_t ntohs(uint16_t netshort); DESCRIPTION
The htonl() function converts the unsigned integer hostlong from host byte order to network byte order. The htons() function converts the unsigned short integer hostshort from host byte order to network byte order. The ntohl() function converts the unsigned integer netlong from network byte order to host byte order. The ntohs() function converts the unsigned short integer netshort from network byte order to host byte order. On the i386 the host byte order is Least Significant Byte first, whereas the network byte order, as used on the Internet, is Most Signifi- cant Byte first. ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7). +-----------------------------------+---------------+---------+ |Interface | Attribute | Value | +-----------------------------------+---------------+---------+ |htonl(), htons(), ntohl(), ntohs() | Thread safety | MT-Safe | +-----------------------------------+---------------+---------+ CONFORMING TO
POSIX.1-2001, POSIX.1-2008. Some systems require the inclusion of <netinet/in.h> instead of <arpa/inet.h>. SEE ALSO
bswap(3), endian(3), gethostbyname(3), getservent(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
2017-09-15 BYTEORDER(3)

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

NAME
htonl, htons, ntohl, ntohs - convert values between host and network byte order SYNOPSIS
#include <arpa/inet.h> uint32_t htonl(uint32_t hostlong); uint16_t htons(uint16_t hostshort); uint32_t ntohl(uint32_t netlong); uint16_t ntohs(uint16_t netshort); DESCRIPTION
The htonl() function converts the unsigned integer hostlong from host byte order to network byte order. The htons() function converts the unsigned short integer hostshort from host byte order to network byte order. The ntohl() function converts the unsigned integer netlong from network byte order to host byte order. The ntohs() function converts the unsigned short integer netshort from network byte order to host byte order. On the i386 the host byte order is Least Significant Byte first, whereas the network byte order, as used on the Internet, is Most Signifi- cant Byte first. ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7). +-----------------------------------+---------------+---------+ |Interface | Attribute | Value | +-----------------------------------+---------------+---------+ |htonl(), htons(), ntohl(), ntohs() | Thread safety | MT-Safe | +-----------------------------------+---------------+---------+ CONFORMING TO
POSIX.1-2001, POSIX.1-2008. Some systems require the inclusion of <netinet/in.h> instead of <arpa/inet.h>. SEE ALSO
bswap(3), endian(3), gethostbyname(3), getservent(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 2017-09-15 BYTEORDER(3)

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