# PHP | convert hexadecimal string to string using pack() function

Convert hexadecimal string to hex in PHP: Here, we are going to learn how to convert a given hexadecimal string to the string? By IncludeHelp Last updated : December 27, 2023

## Prerequisites

To understand this example, you should have the basic knowledge of the following PHP topics:

## Problem statement

Given hexadecimal string and we have to convert it into string of ASCII characters.

## Converting hexadecimal string to string using pack() function

To convert a hex string to the string of ASCII characters, we can use pack() function with the format "H*" it represents that source string is in hexadecimal format.

## Syntax

```pack("H*", hex_string);
```

## Example

```Input: "48656c6c6f20776f726c64"
Output: "Hello world"

Input: "4142432031323320402324252e2058595a"
Output: "ABC 123 @#\$%. XYZ"
```

## PHP Code

```<?php
\$str = "Hello world";
\$hex_str = bin2hex(\$str);
\$str1 = pack("H*", \$hex_str);

//printing both strings
echo ("str = " . \$str . "\n");
echo ("hex_str = " . \$hex_str . "\n");
echo ("str1 = " . \$str1 . "\n");

\$str = "ABC 123 @#\$%. XYZ";
\$hex_str = bin2hex(\$str);
\$str1 = pack("H*", \$hex_str);

//printing both strings
echo ("str = " . \$str . "\n");
echo ("hex_str = " . \$hex_str . "\n");
echo ("str1 = " . \$str1 . "\n");
?>
```

## Output

```str = Hello world
hex_str = 48656c6c6f20776f726c64
str1 = Hello world
str = ABC 123 @#\$%. XYZ
hex_str = 4142432031323320402324252e2058595a
str1 = ABC 123 @#\$%. XYZ
```

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