The `chr()` function in PHP returns a specific character based on an ASCII value. It's a simple but useful function for working with character encoding.PHP 8. PHP 8.1,PHP 8.2,PHP 8.3,and PHP 8.4.

Basic Syntax

<?php
chr(int $ascii): string
?>

Example 2: Common ASCII codes

<?php 
echo chr(10); // Line feed (newline)
echo chr(13); // Carriage return
echo chr(9); // Tab
?>

Important Notes for PHP 8.2

1. The function still works the same way in PHP 8.2 as in previous versions.
2. The input is automatically converted to an integer if it's not one.
3. Values outside 0-255 will be bitwise AND with 255 (equivalent to modulo 256).
4. For Unicode characters, consider using `mb_chr()` from the mbstring extension.

Common Use Cases

- Generating special characters.
- Creating control characters for output.
- Working with binary data.
- Encoding/decoding simple ciphers.

Remember that for modern web applications dealing with UTF-8, you might want to use multibyte string functions instead for full Unicode support.