#    
## PHP functions
PHP has more than a thousand inbuilt functions and enables its developers to create their own functions as well. **Functions** are considered one of the extraordinary strengths of PHP; they are a structure of code that can be used repetitively. They need to be called in order to achieve their specific task. 

#   
## The Ds\Set `join()` function
This function joins the values together by making them a string.

```
string public Ds\Set::join ([ string $glue ] )
```
## Parameters
The function takes in one optional parameter, which is a string to separate each value.

## Return value
This function returns all values joined together as a string.

digraph g {
    bgcolor="transparent"
    E -> join
    d -> join
    u -> join
    c -> join
    a -> join
    t -> join
    i -> join
    v -> join
    e -> join
    join-> Educative 
}

#    
## Code 
The following example shows the `join()` function in action.

<?php 
  

$set = new \Ds\Set(["E", "D", "U", "C", "A", "T", "I", "V", "E"]); 
  
// join() function  
var_dump($set->join()); 
  
?> 

#   
## Output

    string(9) "EDUCATIVE"

What is the Ds\Set join() function in PHP?

The Ds\Set join() function in PHP concatenates set values into a single string, optionally separated by a specified delimiter.