How to convert hexadecimal data to array in php

PHP is a powerful server-side scripting language that is widely used in web development. In the development process of PHP, we often need to deal with data conversion and processing. This article will introduce how to convert hexadecimal data into an array.

First of all, we need to understand what hexadecimal is. Simply put, hexadecimal is a number system that uses 16 numbers to represent values, namely 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, and D. , E and F. Among them, A~F represent 10~15 respectively.

In PHP, we can use the hex2bin() function to convert hexadecimal to a string. For example, the following code converts the hexadecimal string "48656C6C6F20576F726C64" into the string "Hello World":

echo hex2bin("48656C6C6F20576F726C64");

Next, we need to convert the string into an array. We can use the str_split() function to split the string into individual characters, and then use the ord() function to convert the characters to ASCII code. For example, the following code splits the string "Hello World" into an array of integers:

$str = "Hello World";
$chars = str_split($str);
$nums = array();
foreach ($chars as $char) {
    $nums[] = ord($char);
}
print_r($nums);

The output result is:

Array
(
    [0] => 72
    [1] => 101
    [2] => 108
    [3] => 108
    [4] => 111
    [5] => 32
    [6] => 87
    [7] => 111
    [8] => 114
    [9] => 108
    [10] => 100
)

If we have converted the hexadecimal string to a string, You can use the above two code snippets together. For example, the following code converts the hexadecimal string "48656C6C6F20576F726C64" into an integer array:

$hex_str = "48656C6C6F20576F726C64";
$str = hex2bin($hex_str);
$chars = str_split($str);
$nums = array();
foreach ($chars as $char) {
    $nums[] = ord($char);
}
print_r($nums);

The output result is:

Array
(
    [0] => 72
    [1] => 101
    [2] => 108
    [3] => 108
    [4] => 111
    [5] => 32
    [6] => 87
    [7] => 111
    [8] => 114
    [9] => 108
    [10] => 100
)

In addition to using the above method, we can also use unpack() function. The unpack() function can unpack a string into multiple values, returning an associative array or a numerically indexed array. We can use the H* formatting character, which means converting a hexadecimal string into a hexadecimal number and packaging it into a binary string. For example, the following code converts the hexadecimal string "48656C6C6F20576F726C64" into an integer array:

$hex_str = "48656C6C6F20576F726C64";
$bin_str = pack("H*", $hex_str);
$nums = unpack("C*", $bin_str);
print_r($nums);

The output result is:

Array
(
    [1] => 72
    [2] => 101
    [3] => 108
    [4] => 108
    [5] => 111
    [6] => 32
    [7] => 87
    [8] => 111
    [9] => 114
    [10] => 108
    [11] => 100
)

Using the unpack() function is more concise and efficient, but it requires Note that the asterisk (*) in the function name of the unpack() function means unpacking all elements, not any format.

Summary: This article introduces how to convert hexadecimal data into an array. We can use the hex2bin() function to convert hexadecimal to a string, then use the str_split() function to split it into individual characters, and finally use the ord() function to convert the characters to ASCII codes. In addition to this, we can also use the unpack() function to achieve conversion more efficiently. These methods will be very useful in actual development.

The above is the detailed content of How to convert hexadecimal data to array in php. For more information, please follow other related articles on the PHP Chinese website!