PHP | Ds\Deque isEmpty() Function Last Updated : 11 Jul, 2025 Summarize Comments Improve Suggest changes Share Like Article Like Report The Ds\Deque::isEmpty() function is an inbuilt function in PHP which is used to check the Deque is empty or not. Syntax: public Ds\Deque::isEmpty( void ) : bool Parameters: This function does not accept any parameter. Return Value: This function returns true if the Deque is empty, else return false. Below programs illustrate the Ds\Deque::isEmpty() 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); // Use isEmpty() function to check // the deque is empty or not var_dump($deck->isEmpty()); ?> Output: Original Deque Ds\Deque Object ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => 6 ) bool(false) Program 2: 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); // Clearing the Deque $deck->clear(); // Use isEmpty() function to check // the deque is empty or not var_dump($deck->isEmpty()); ?> Output: Original Deque Ds\Deque Object ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => 6 ) bool(true) Reference: https://www.php.net/manual/en/ds-deque.isempty.php Comment More infoAdvertise with us Next Article PHP | Ds\Deque insert() 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 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 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 Like