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This article mainly explains "how to use pack in php". The content in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn how to use pack in php.

Pack in php means "load", and the pack () function is a miscellaneous function in php that is used to load data into a binary string with the syntax "pack (format,args+)", "format" for the format used when wrapping the data, and "args+" for the wrapped parameters.

The operating environment of this tutorial: windows10 system, PHP7.1 version, DELL G3 computer.

What is the meaning of pack in php

The pack in php means to load.

The pack () function loads the data into a binary string.

The syntax is as follows:

Pack (format,args+)

The parameter format indicates the format to be used when wrapping the data.

A-NUL populated string

String populated by A-SPACE

H-hexadecimal string, low first

H-hexadecimal string, high order comes first

C-signed char

C-unsigned char

S-signed short (always 16 bits, machine byte order)

S-unsigned short (always 16 bits, machine byte order)

N-unsigned short (always 16 bits, big endian byte order)

V-unsigned short (always 16 bits, little endian byte order)

I-signed integer (depending on the size and byte order of machine)

I-unsigned integer (depending on machine size and byte order)

L-signed long (always 32 bits, machine byte order)

L-unsigned long (always 32 bits, machine byte order)

N-unsigned long (always 32 bits, big endian byte order)

V-unsigned long (always 32 bits, little endian byte order)

F-float (depending on the size and representation of the machine)

D-double (depending on the size and representation of the machine)

X-NUL byte

X-back up one byte

Z-NUL filled string

@-NUL fill absolute position

The parameter args+ represents one or more parameters that are specified to be wrapped.

Examples are as follows:

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