In PHP 8.5, the join() function remains exactly the same as in previous versions: it is a simple alias for implode(). There are no behavioral changes or deprecations specific to PHP 8.5 for this function .
Function Signature
join(string $separator, array $array): string
Example
You can use it to combine array elements into a single string, which is especially useful when building SQL queries or formatting output.
<?php
$glue = , ;
$pieces = [ Apple , Banana , Orange ];// Using join() is identical to using implode()
$result = join($glue, $pieces);echo $result;
// Output: Apple, Banana, Orange
?>
Key Notes
→Alias of implode(): Because it is an alias, you can use join() and implode() interchangeably. Many developers prefer join() simply for better readability in certain contexts .
→Parameter Order: Like implode(), the function accepts the separator first, followed by the array. (Note: The legacy syntax where the array is passed first is no longer supported in modern PHP versions).
→Associative Arrays: It only joins the values of the array, ignoring the keys .
If you are migrating legacy code to PHP 8.5, join() is completely safe to use without any modifications.