PHP list() Function

PHP | pack() Function

Last Updated : 27 Sep, 2019

The pack() function is an inbuilt function in PHP which is used to pack the given parameter into a binary string in a given format. Syntax:

pack( $format, $arguments )

Parameters: This function accepts two parameters as mentioned above and described below:

$format: It is required parameter. It specifies the format to be used while packing the data. The possible values of format are:
- a - string which is NUL-padded
- A - string which is SPACE-padded
- h - low nibble first Hex string
- H - high nibble first Hex string
- c - signed character
- C - unsigned character
- s - signed short (16 bit, machine byte order)
- S - unsigned short ( 16 bit, machine byte order)
- n - unsigned short ( 16 bit, big endian byte order)
- v - unsigned short ( 16 bit, little endian byte order)
- i - signed integer (machine dependent byte order and size)
- I - unsigned integer (machine dependent byte order and size)
- l - signed long ( 32 bit, machine byte order)
- L - unsigned long ( 32 bit, machine byte order)
- N - unsigned long ( 32 bit, big endian byte order)
- V - unsigned long ( 32 bit, little endian byte order)
- f - float (machine dependent representation and size)
- d - double (machine dependent representation and size)
- x - NUL byte
- X - Back up one byte
- Z - string which is NUL-padded
- @ - NUL-fill to absolute position
$arguments: It is Optional parameter. It specifies one or more arguments to be packed.

Return Value: It returns a binary string containing data. Note: This function is available on PHP 4.0.0 and newer version. Program 1: This program uses C format to format the input parameter.

php

<?php
echo pack("C13", 71, 69, 69, 75, 83, 70, 79, 82, 71, 69, 69, 75, 83);
?>

Output:

GEEKSFORGEEKS

Program 2: This program uses A format to format the input parameter.

php

<?php
echo pack("A3", 71898);
?>

Output:

Program 3: This program uses i format to format the input parameter.

php

<?php
echo pack("i3", 56, 49, 54);
?>

Output:

Reference: https://www.php.net/manual/en/function.pack.php

PHP list() Function

G

gekcho

Improve

Article Tags :

Similar Reads

PHP array_pad() Function

The array_pad() is a builtin function in PHP and is used to pad a value fixed number of time onto an array. This function inserts an element specified number of times into an array either at front or back. Syntax: array array_pad($input_array, $input_size, $values) Parameters: This function accepts

PHP list() Function

The list() function is an inbuilt function in PHP which is used to assign array values to multiple variables at a time. This function will only work on numerical arrays. When the array is assigned to multiple values, then the first element in the array is assigned to the first variable, second to th

PHP implode() Function

The implode() is a built-in function in PHP and is used to join the elements of an array. implode() is an alias for PHP | join() function and works exactly same as that of join() function.If we have an array of elements, we can use the implode() function to join them all to form one string. We join

PHP | zip_open() Function

The zip_open() function is an inbuilt function in PHP which is used to open a zip archive for reading. The zip_open() function creates a new stream and establishes a connection between the stream and a Zip Archive. The filename is sent as a parameter to the zip_open() function and it returns a valid

PHP | unpack() Function

The unpack() function is an inbuilt function in PHP which is used to unpack from a binary string into the respective format. Syntax: array unpack( $format, $data, $offset ) Parameters: This function accepts three parameters as mentioned above and described below: $format: It is required parameter. I

PHP | array_map() Function

The array_map() is an inbuilt function in PHP and it helps to modify all elements one or more arrays according to some user-defined condition in an easy manner. It basically, sends each of the elements of an array to a user-defined function and returns an array with new values as modified by that fu

PHP | hash_file( ) Function

The hash_file() function is an inbuilt function in PHP which is used to generate a hash value using the contents of a given file. Syntax: string hash_file( $algo, $file, $raw_opt ) Parameters: This function accept three parameters as mention above and describe below. $algo: It is the required parame

PHP | fwrite( ) Function

The fwrite() function in PHP is an inbuilt function which is used to write to an open file. The fwrite() function stops at the end of the file or when it reaches the specified length passed as a parameter, whichever comes first. The file, string and the length which has to be written are sent as par

PHP | each() Function

The each() function is an inbuilt function in PHP which basically returns an array with four elements, two elements (1 and Value) for the element value, and two elements (0 and Key) for the element key and moves the cursor forward. Syntax: each(array) Parameters: Array: It specifies the array which

PHP each() Function

The each() function is an inbuilt function in PHP and is used to get the current element key-value pair of the given array to which the internal pointer is currently pointing. After returning the key and value of the current element the internal pointer is incremented by one in the array. Note: You