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 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 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
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