To implement a constructor is two variables , and the other constructor is an array .
For example:
public function construct($id, $dname) public function construct($device=array())
I only found on the Internet that it can be implemented by judging the number of parameters through func_num_args. Is there any way to implement it by judging the type?
It is impossible to have two method functions with the same name in one file at the same time
2. If they are in different files, you can use namespace to implement the same function Call (php version must be 5.3.0 or above)
So your judgment has no real meaning
PHP cannot be overloaded, change the parameters to an array and make the difference within the function
I Want to see how they coexist in the source code, inheritance?
gettype -- Get the type of the variable
construct is not the constructor of the php class
construct is!
Although php does not support overloading, the poster did not say that it is a method with the same name in a class
Judge the parameter type in the constructor construct, and then take different branches That's it. If you don’t support overloading natively, just simulate it~
php does not support function overloading like C. Just like you said, use the func_num_arg function and then judge the parameters to branch initialization
You can determine the number and type of parameters in construct.
<?php class demo{ private $_args; public function construct(){ $args_num = func_num_args(); if($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))){ $this->_args = array( 'device'=>func_get_arg(0) ); }else{ exit('func param not match'); } } public function show(){ echo '<pre class="brush:php;toolbar:false">'; print_r($this->_args); echo ''; } } // demo1 $id = 1; $dname = 'fdipzone'; $obj = new demo($id, $dname); $obj->show(); // demo2 $device = array('iOS','Android'); $obj = new demo($device); $obj->show(); ?>
The above is the detailed content of Solution to the problem of multiple constructors in php. For more information, please follow other related articles on the PHP Chinese website!

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

查找方法:1、用strpos(),语法“strpos("字符串值","查找子串")+1”;2、用stripos(),语法“strpos("字符串值","查找子串")+1”。因为字符串是从0开始计数的,因此两个函数获取的位置需要进行加1处理。


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

SublimeText3 Chinese version
Chinese version, very easy to use

SublimeText3 English version
Recommended: Win version, supports code prompts!

MantisBT
Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.

Dreamweaver CS6
Visual web development tools

WebStorm Mac version
Useful JavaScript development tools