The `join()` function in PHP is an alias of `implode()`, which joins array elements into a string. Both functions work identically, and you can use either one based on your preference.PHP 8. PHP 8.1,PHP 8.2,PHP 8.3 and PHP 8.4.Basic Syntax

<?phpjoin(string $separator, array $array): string?>

Example Usage in PHP 8.2

<?php// Example 1: Simple join with comma separator$fruits = ['apple', 'banana', 'orange'];$result = join(', ', $fruits);echo $result; // Output: apple, banana, orange?>

Important Notes for PHP 8.21. The `join()` function remains fully supported in PHP 8.2.2. The parameter order is `separator` first, then `array` (the opposite of some other languages).3. If your array contains non-string values, they will be converted to strings automatically.4. Passing a non-array value to `join()` will throw a TypeError in PHP 8.0+.