The Ds\Deque::join() function is an inbuilt function in PHP which is used to join all values in the Deque as a string. The separator can also be used to join the elements.
Syntax:
public Ds\Deque::join( $glue ) : string
Parameters: This function accepts single parameter $glue which holds the separator to separate Deque elements.
Return Value: This function returns all values of the Deque joined as a string.
Below programs illustrate the Ds\Deque::join() function in PHP:
Program 1:
<?php   // Declare a deque $deck = new \Ds\Deque([1, 2, 3, 4, 5, 6]);   echo("Original Deque\n");   // Display the Deque elements print_r($deck);   echo("\nString form: ");   // Use join() function to joining // the values in Deque var_dump($deck->join("|"));   ?> |
Output:
Original Deque
Ds\Deque Object
(
[0] => 1
[1] => 2
[2] => 3
[3] => 4
[4] => 5
[5] => 6
)
String form: string(11) "1|2|3|4|5|6"
Program 2:
<?php   // Declare a deque $deck = new \Ds\Deque(["Geeks", "for", "Geeks"]);   echo("Original Deque\n");   // Display the Deque elements print_r($deck);   echo("\nString form: ");   // Use join() function to joining // the values in Deque var_dump($deck->join());   ?> |
Output:
Original Deque
Ds\Deque Object
(
[0] => Geeks
[1] => for
[2] => Geeks
)
String form: string(13) "neveropen"
Reference: http://php.net/manual/en/ds-deque.join.php
