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PHP小技巧之函数重载_PHP

WBOY
WBOYOriginal
2016-06-01 11:52:27821browse

1.可以使用func_get_args()和func_num_args()这两个函数实现函数的重载!!

PHP代码:

复制代码 代码如下:
function rewrite() {  
            $args = func_get_args();  
            if(func_num_args() == 1) {  
                    func1($args[0]);  
            } else if(func_num_args() == 2) {  
                    func2($args[0], $args[1]);  
            }  
    }  
    function func1($arg) {  
            echo $arg;  
    }  
    function func2($arg1, $arg2) {  
            echo $arg1, ' ', $arg2;  
    }  
    rewrite('PHP'); //调用func1  
    rewrite('PHP','China'); //调用func2

2.使用默认值,从而根据输入,得到自己想要的结果:

复制代码 代码如下:
function test($name="小李",$age="23"){ 
        echo $name."  ".$age; 
        } 

    test(); 
    echo "
"; 
    test("a"); 
    echo "
"; 
    test("a","b");

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