PHP：在构造函数中调用用户定义的函数？
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PHP: Calling a user-defined function inside constructor?
提问by Prashant
I have a class userAuthinside its constructor I have added code to check the user is valid or not, if there is no value in session then I check cookies (as a part of "Remember Me" feature), if there is some value inside cookies then I call a function ConfirmUserto check its authenticity from database. On the basis of value returned by the confirmUser function I am returning a bool (true or fales) value in constructor.
我userAuth在它的构造函数中有一个类我添加了代码来检查用户是否有效，如果会话中没有值，那么我检查 cookie（作为“记住我”功能的一部分），如果 cookie 中有一些值然后我调用一个函数ConfirmUser从数据库中检查它的真实性。根据confirmUser 函数返回的值，我在构造函数中返回一个bool（true 或fales）值。
I have created my class as:
我已经创建了我的班级：
<?php
class userAuth {
function userAuth(){
//code
}
function confirmUser($username, $password){
//code
}
}
$signin_user = new userAuth();
?>
confirmUserfunction take two string type parameters and return return a integer value of 0, 1, 2.
confirmUser函数接受两个字符串类型参数并返回一个整数值 0、1、2。
I can't add code of confirmUserfunction inside the constructor as I am using this function at some more places in my application.
我无法confirmUser在构造函数中添加函数代码，因为我在应用程序的更多地方使用了这个函数。
So, I want to know how to call a user-defined function inside constructor in PHP. Please help.
所以，我想知道如何在 PHP 的构造函数中调用用户定义的函数。请帮忙。
Thanks!
谢谢！
回答by DampeS8N
$this->nameOfFunction()
$this->nameOfFunction()
But when they are in a class, they are called Methods.
但是当它们在一个类中时，它们被称为方法。
回答by adsc
Be careful with using $this in a constructor, though, because in an extension hierarchy, it can cause unexpected behaviour:
但是，在构造函数中使用 $this 时要小心，因为在扩展层次结构中，它可能会导致意外行为：
<?php
class ParentClass {
public function __construct() {
$this->action();
}
public function action() {
echo 'parent action' . PHP_EOL;
}
}
class ChildClass extends ParentClass {
public function __construct() {
parent::__construct();
$this->action();
}
public function action() {
echo 'child action' . PHP_EOL;
}
}
$child = new ChildClass();
Output:
输出：
child action
child action
Whereas:
然而：
class ParentClass {
public function __construct() {
self::action();
}
public function action() {
echo 'parent action' . PHP_EOL;
}
}
class ChildClass extends ParentClass {
public function __construct() {
parent::__construct();
self::action();
}
public function action() {
echo 'child action' . PHP_EOL;
}
}
$child = new ChildClass();
Output:
输出：
parent action
child action
回答by Caner
There is no difference between calling a function inside a constructor and calling from somewhere else. If the method is declared in the same class you should use $this->function()
在构造函数内部调用函数和从其他地方调用没有区别。如果该方法在同一个类中声明，则应使用$this->function()
By the way, in php5 you are suggested to name your constructor like this:function __construct()
顺便说一句，在 php5 中，建议您像这样命名构造函数：function __construct()
If not then put publickeyword before your constructor definition like this public function userAuth()
如果没有，则public在构造函数定义之前放置关键字，如下所示public function userAuth()
回答by Shakti Singh
you can call with $this
你可以用 $this 打电话
<?php
class userAuth {
function userAuth($username, $password){
$this->confirmUser($username, $password);
}
function confirmUser($username, $password){
//code
}
}
$signin_user = new userAuth($username, $password);
?>
