PHP Ds\Map __construct()函数用法示例详解

2021年4月8日17:51:37 发表评论 916 次浏览

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
        )

)

参考: https://www.php.net/manual/en/ds-map.construct.php


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