The Ds\Map::__construct() function is an inbuilt function in PHP which is used to creates a new instance.
Syntax:
public Ds\Map::__construct( $values )
Parameter: This function accepts a single parameter $values which holds the traversable object or array to use initial values.
Below programs illustrate the Ds\Map::__construct() function in PHP:
Program 1:
<?php // PHP program to illustrate the __construct() // function of Ds\map // Declare a new Map $map = new \Ds\Map();
// Display the map elements print_r( $map );
// Creating a Map $map = new \Ds\Map([
"1" => "Geeks" ,
"2" => "for" ,
"3" => "Geeks"
]); // Display the map elements print_r( $map );
?> |
Output:
Ds\Map Object ( ) Ds\Map Object ( [0] => Ds\Pair Object ( [key] => 1 [value] => Geeks ) [1] => Ds\Pair Object ( [key] => 2 [value] => for ) [2] => Ds\Pair Object ( [key] => 3 [value] => Geeks ) )
Program 2:
<?php // PHP program to illustrate the __construct() // function of Ds\map // Creating a Map $map = new \Ds\Map([ "1" => "10" ,
"2" => "20" , "3" => 30]);
// Display key-value pair print_r( $map );
// Creating another Map $map = new \Ds\Map([1 => "Welcome" ,
2 => "to" , 3 => "GeeksforGeeks" ]);
// Display key-value pair print_r( $map );
?> |
Output:
Ds\Map Object ( [0] => Ds\Pair Object ( [key] => 1 [value] => 10 ) [1] => Ds\Pair Object ( [key] => 2 [value] => 20 ) [2] => Ds\Pair Object ( [key] => 3 [value] => 30 ) ) Ds\Map Object ( [0] => Ds\Pair Object ( [key] => 1 [value] => Welcome ) [1] => Ds\Pair Object ( [key] => 2 [value] => to ) [2] => Ds\Pair Object ( [key] => 3 [value] => GeeksforGeeks ) )
Reference: https://www.php.net/manual/en/ds-map.construct.php