PHP小技巧之函数重载

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

function test($name="小李",$age="23"){  
        echo $name."  ".$age;  
        }  

    test();  
    echo "<br/>";  
    test("a");  
    echo "<br/>";  
    test("a","b");