What does pack in php mean?

pack in php means "loading". The pack() function is a miscellaneous function in php. This function is used to load data into a binary string. The syntax is "pack(format,args )", "format" indicates the format used when packaging data, and "args" indicates the packed parameters.

The operating environment of this tutorial: Windows 10 system, PHP version 7.1, DELL G3 computer.

What does pack in php mean?

pack in php means loading.

pack() function loads data into a binary string.

The syntax is as follows:

pack(format,args+)

The parameter format indicates the format used when packaging data.

• a - NUL padded string

• A - SPACE padded string

• h - Hexadecimal string, low byte first

• H - Hexadecimal string, high byte 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 (depends on machine size and byte order)

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

• l - signed long (total Is 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 (depends on machine size and representation)

• d - double (depends on machine size and representation)

• x - NUL byte

• X - Back up one byte

• Z - NUL padded string

• @ - NUL fills the absolute position

Parameter args represents one or more parameters that are specified to be packed.

Examples are as follows:

<?php
echo pack("C3",80,72,80);
?>

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