Share the method of constructor function in php supporting different number of parameters

php Constructor functionSupports different number of parameter methods

Principle: In construct Use func_num_args to get the number of parameters, and then perform different calls based on the number of parameters. The parameter value is obtained using the func_get_arg() method.

demo:

<?php
class demo{

    private $_args;

    public function construct(){
        $args_num = func_num_args(); // 获取参数个数

        // 判断参数个数与类型
        if($args_num==2){
            $this->_args = array(
                                &#39;id&#39; => func_get_arg(0),
                                &#39;dname&#39; => func_get_arg(1)
                            );
        }elseif($args_num==1 && is_array(func_get_arg(0))){
            $this->_args = array(
                                &#39;device&#39;=>func_get_arg(0)
                            );
        }else{
            exit(&#39;func param not match&#39;);
        }    
    }

    public function show(){
        echo &#39;<pre class="brush:php;toolbar:false">&#39;;
        print_r($this->_args);
        echo &#39;

';     } } // demo1 $id = 1; $dname = 'fdipzone'; $obj = new demo($id, $dname); $obj->show(); // demo2 $device = array('iOS','Android'); $obj = new demo($device); $obj->show(); ?>

Output after demo execution:

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

)

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