PHP Ds\Map __construct()函数用法示例详解 _map

Ds\Map::__ construct()function是PHP中的内置函数, 用于创建新实例。
语法如下：

public Ds\Map::__construct( $values )

参数：该函数接受单个参数$值包含可遍历的对象或数组以使用初始值。
下面的程序说明了Ds\Map::__ construct()PHP中的功能：
程序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 ); ?>

输出如下：

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 ))

程序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 => "lsbin" ]); //Display key-value pair print_r( $map ); ?>

输出如下：

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] => lsbin ))

【PHP Ds\Map __construct()函数用法示例详解】参考： https://www.php.net/manual/en/ds-map.construct.php