PHP 默認(rèn)參數(shù)值函數(shù)

PHP允許您定義C++風(fēng)格的默認(rèn)參數(shù)值。愛掏網(wǎng) - it200.com在這種情況下，如果您不向函數(shù)傳遞任何值，它將使用默認(rèn)的參數(shù)值。愛掏網(wǎng) - it200.com

讓我們看一個(gè)在函數(shù)中使用PHP默認(rèn)參數(shù)的簡單示例。愛掏網(wǎng) - it200.com

示例1

<?php
function sayHello(name="Ram"){
echo "Helloname";
}
sayHello("Sonoo");
sayHello();//passing no value
sayHello("Vimal");
?>

輸出：

Hello Sonoo
Hello Ram
Hello Vimal

自從PHP 5開始，您還可以在引用調(diào)用中使用默認(rèn)參數(shù)值的概念。愛掏網(wǎng) - it200.com

示例2

";  
}  
greeting();
greeting("Rahul");
greeting("Michael","Clark");
?>  

輸出：

Greeting: Sonoo Jaiswal
Greeting: Rahul Jaiswal
Greeting: Michael Clark

示例3

<?php
function add(n1=10,n2=10){
n3=n1+n2;
echo "Addition is:n3";
}
add();
add(20);
add(40,40);
?>

輸出:

Addition is: 20
Addition is: 30
Addition is: 80