Programming PHP, 3rd Edition

Name

pack

Synopsis

string pack(string format, mixed arg1[, mixed arg2[, ... mixed argN]])

Creates a binary string containing packed versions of the given arguments according to format. Each character may be followed by a number of arguments to use in that format, or an asterisk (*), which uses all arguments to the end of the input data. If no repeater argument is specified, a single argument is used for the format character. The following characters are meaningful in the format string:

a	NUL-byte-padded string
A	Space-padded string
h	Hexadecimal string, with the low nibble first
H	Hexadecimal string, with the high nibble first
c	Signed char
C	Unsigned char
s	16-bit, machine-dependent byte-ordered signed short
S	16-bit, machine-dependent byte-ordered unsigned short
n	16-bit, big-endian byte-ordered unsigned short
v	16-bit, little-endian byte-ordered unsigned short
i	Machine-dependent size and byte-ordered signed integer
I	Machine-dependent size and byte-ordered unsigned integer
l	32-bit, machine-dependent byte-ordered signed long
L	32-bit, machine-dependent byte-ordered unsigned long
N	32-bit, big-endian byte-ordered unsigned long
V	32-bit, little-endian byte-ordered unsigned long
f	Float in machine-dependent size and representation
d	Double in machine-dependent size and representation
x	NUL-byte
X	Back up one byte
@	Fill to absolute position (given by the repeater argument) with NUL-bytes