In PHP, the function of pack() function is to convert data into binary string

pack() function packs data into a binary string.

Syntax

pack(format , args)

Parameters

• Format - The format to use. The following are the possible values ​​-

  • a - NUL padded string

  • A - Space padded String

  • h - Hexadecimal string, low nibble first

  • H - Hexadecimal string, high nibble first

  • c - Signed character

  • C - Unsigned character

  • s - Signed short character (always 16 bits, machine byte order)

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

  • n - Unsigned Short (always 16 bits, big endian)

  • 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 (always is 32 bits, machine byte order)

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

  • N - unsigned long (always 32-bit, big-endian)

  • V - unsigned long (always is 32-bit, little-endian)

  • f - float (depends on machine size and representation)

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

  • x - NUL byte

  • X - Back up one byte

  • Z − NUL padding string

  • @ − NUL padded to absolute position

• args - One or more arguments to be packed.

Return

The pack() function returns a binary string containing data.

Example

Real-time demonstration

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

Output

The following is the output.

AMIT

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