PHP | Ds\Map hasKey() Function Last Updated : 20 Aug, 2019 Comments Improve Suggest changes Like Article Like Report The Ds\Map::hasKey() function in PHP is used to check whether a given Key is present in the Map object or not. It accepts the key to be checked as a parameter and return True if the key is present in the Map otherwise it returns False. Syntax: bool public Ds\Map::hasKey ( mixed $key ) Parameter: It accepts a Key to be checked as a parameter. The key is of the mixed type that is it can be a string or an integer or any other type of value. Return value: This function returns a boolean value True or False based on whether the given key is present in the Map or not. Below program illustrate the Ds\Map::hasKey() function of Ds\Map: Program 1: php <?php // PHP program to illustrate the hasKey() // function of Ds\map // Creating a Map $map = new \Ds\Map(["1" => 5, "2" => 10, "3" => 15]); // check if the key "1" is present in the Map var_dump($map->hasKey("1")); ?> Output: bool(true) Program 2: php <?php // PHP program to illustrate the hasKey() // function of Ds\map // Creating a Map $map = new \Ds\Map(["Geeks" => "1", "for" => "2", "Geeks" => "3"]); // Check if the key "Geeks" is // present in the Map var_dump($map->hasKey("Geeks")); ?> Output: bool(true) Reference: http://php.net/manual/en/ds-map.clear.php Comment More infoAdvertise with us Next Article PHP | Ds\Map hasKey() Function G gopaldave Follow Improve Article Tags : Web Technologies PHP PHP-function PHP-ds_map Similar Reads PHP DsSet isEmpty() Function The Ds\Set::isEmpty() function of Ds\Set class in PHP is an inbuilt function which is used to check whether a set is empty or not. If the Set instance is empty then this function returns true otherwise it returns False. Syntax: bool public Ds\Set::isEmpty ( void ) Parameters: This function does not 1 min read PHP | DsDeque 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 key() Function The key() function is an inbuilt function in PHP which is used to return the index of the element of a given array to which the internal pointer is currently pointing. The current element may be starting or next element which depends on the cursor position. By default cursor position is at zero inde 2 min read PHP | DsVector map() Function The Ds\Vector::map() function is an inbuilt function in PHP which is used to return the result of a callback after applying to each value in the vector. Syntax: Ds\Vector public Ds\Vector::map( $callback ) Parameters: This function accepts single parameter $callback which is to be applied to each ve 2 min read PHP key_​exists() Function The key_exists() function is an inbuilt function in PHP that is used to check whether the given key exist in the given array or not. If given key exist in the array then it returns true otherwise returns false. This function is an alias of array_key_exists() function. Syntax: bool key_exists(string| 2 min read Like