Methods for PHP constructors to support different number of parameters

PHP constructors support different number of parameter methods

Principle: Use Func_num_args to get the number of parameters in __construct, and then perform different calls based on the number of parameters. Parameter values are obtained using the Func_get_arg () method.

Demo

<?php class demo{Private $_args; Public Function __construct () {$args _num = Func_num_args ();//Get the number of arguments//determine the number of parameters and type if ($args _num==2)  
                                {$this->_args = array (' ID ' => func_get_arg (0),  
        ' Dname ' => func_get_arg (1));  
                                }elseif ($args _num==1 && is_array (func_get_arg (0))) {$this->_args = array (  
        ' Device ' =>func_get_arg (0));  
        }else{exit (' func param not match ');  
        } public Function Show () {echo ' <pre> ';  
        Print_r ($this->_args);  
    Echo ' </pre> ';  
}//Demo1 $id = 1;  
$dname = ' Fdipzone ';  
$obj = new Demo ($id, $dname);  
      
$obj->show (); Demo2 $device = Array (' IOS ', ' Android ');  
$obj = new Demo ($device);  
$obj->show (); ?>

Demo Output after execution:

Array  
(  
    [id] => 1  
    [dname] => fdipzone  
)  
array  
([  
    device] => array  
        ([  
            0] => IOS  
            [1] => Android  
        )  
      

Author: csdn blog proud Snow star Maple

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