PHP | Ds\Deque join() Function Last Updated : 11 Jul, 2025 Comments Improve Suggest changes Like Article Like Report 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 <?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 <?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) "GeeksforGeeks" Reference: https://www.php.net/manual/en/ds-deque.join.php Comment More infoAdvertise with us Next Article PHP | Ds\Deque map() Function B barykrg Follow Improve Article Tags : Web Technologies PHP PHP-function Similar Reads PHP | Ds\Deque insert() Function The Ds\Deque::insert() function is an inbuilt function in PHP which is used to insert the value at the given index in the Deque. Syntax: public Ds\Deque::insert( $index, $values ) : void Parameters: This function accepts two parameter as mentioned above and described below: $index: This parameter ho 2 min read PHP | Ds\Deque insert() Function The Ds\Deque::insert() function is an inbuilt function in PHP which is used to insert the value at the given index in the Deque. Syntax: public Ds\Deque::insert( $index, $values ) : void Parameters: This function accepts two parameter as mentioned above and described below: $index: This parameter ho 2 min read PHP | Ds\Deque map() Function The Ds\Deque::map() function is an inbuilt function in PHP which is used to return the Deque with each element modified on the basis of operation performed as per the callback function. Syntax: public Ds\Deque::map( $callback ) : Ds\Deque Parameters: This function accepts single parameter $callback 2 min read PHP | Ds\Deque map() Function The Ds\Deque::map() function is an inbuilt function in PHP which is used to return the Deque with each element modified on the basis of operation performed as per the callback function. Syntax: public Ds\Deque::map( $callback ) : Ds\Deque Parameters: This function accepts single parameter $callback 2 min read PHP | Ds\Deque get() Function The Ds\Deque::get() function is an inbuilt function in PHP which is used to return the value at the given index. Syntax: public Ds\Deque::get( $index ) : mixed Parameters: This function accepts single parameter $index which holds the index for which element is to be found. Return Value: This functio 2 min read PHP | Ds\Deque get() Function The Ds\Deque::get() function is an inbuilt function in PHP which is used to return the value at the given index. Syntax: public Ds\Deque::get( $index ) : mixed Parameters: This function accepts single parameter $index which holds the index for which element is to be found. Return Value: This functio 2 min read Like