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In php, the class name::class, what does it mean?

I would like to ask: In the following PHP code, what does the class name::class mean? {code...}

曾經(jīng)蠟筆沒有小新 2017-06-30 09:54:29 0  2  1000

Title rewritten to: Error: Invalid element type: Expected string (for built-in components) or class/function (for composite components) but got undefined element type

How can I solve this problem in my ReactNative code? The error reads "Error: Invalid element type: expected string (for built-in components) or class/function (for composite components), but got undefined. You may have forgotten to export the component from the file in which it was defined, or ...

P粉701491897 2023-09-01 13:23:24 0  1  731

Fatal error occurs in the test database: Class 'think\Controller' not found in C:\php\WWW\t\application\admins\controller\Test.php on line 8

Fatal error: Class 'think\Controller' not found in C:\php\WWW\t\application\admins\controller\Test.php on line 8 There is no foundation at all... the PHP integrated environment used

有宏陸 2019-06-17 17:24:09 0  2  1983

I know how to cut pictures on the front end and want to learn PHP website development. I would like to ask for a complete class video of the physical class of a first-line PHP institution in Beijing.

I know how to cut pictures on the front end and want to learn PHP website development. I would like to ask for a complete class video of the physical class of a first-line PHP institution in Beijing. I learned front-end cutting at an institution before, and then became a cutter, but I didn’t have mu...

. 2017-08-28 14:28:41 0  1  1506

How can I access the page directly without logging in, or how can I remove the login function?

<?php /** * Front page base class */ class WebLoginBase extends WebBase{ public $type; public $groupId; public $played; public $NO; public $

Keevi 2021-03-09 07:41:25 0  1  1993

Unable to delete or update parent row

I'm a new user. I would like to ask about an error I encountered in my homework project. I create room_type_id which is the primary key in the room type table. The room_type_id is then included in the room table as a foreign key. The problem is if I enter one of the room type IDs as RI2 instead of R...

P粉696891871 2024-02-26 00:10:28 0  1  545

How can I access the page directly without logging in, or how can I remove the login function?

<?php/** * Front page base class */class WebLoginBase extends WebBase{ public $type; public $groupId; public $played; public $NO; public $gameFanDian; function __construct($dsn, $user='&# 39

Keevi 2021-03-09 07:38:45 0  1  2303

zend-framework - Configuration issues of getServiceConfig function in zend framework2 and 3

{code...} {code...} What type is $sm? How do you understand Model\AlbumTableGateway::class? The AlbumTableGateway class does not appear in the entire project, only the AlbumTable class

phpcn_u1582 2017-05-16 16:43:14 0  1  730

Four days in a row! PHP Chinese website's large-scale public welfare live broadcast class: "php full stack development experience sharing" is launched, and it continues to be exciting!

Gold 9 and Silver 10 are the seasons for learning! In order to better help PHP learners, PHP Chinese website has held a large-scale public welfare live broadcast class: "php full-stack development experience sharing", which will be broadcast on time at 10 o'clock this morning. Four senior ...

PHPz 2018-10-17 09:05:25 1  1  3139

$this in PHP class

class DBmodel{     private $name;     public __construct(){     $this->name = $name;     } &

A _ Ｑ _ｉ_ 2021-10-10 19:59:11 0  5  994

Does anyone know where Jingshui Brother Shui has a PHP class?

Who knows where Brother Shui in Jingshui has a PHP class? Who knows where Brother Shui in Jingshui has a PHP class?

A0五花牛 2020-10-10 00:54:44 0  1  1212

iOS: Null pointer reference when encoding non-null enum type?

The structure is roughly like this. Class A contains an array of class B. Class B contains a variable of enumeration type C. When A is initially initialized, 10 B elements are initialized as shown in the figure. Except In addition, the B array in class A has not been modified. However, when encoding...

淡淡煙草味 2017-05-31 10:36:30 0  1  1003

Questions about object references in Java

1. Do all references to class objects only store memory addresses? 2. Are all references to class objects of the same data type as the class object? String a = new String("b") Can a be regarded as a String type? 3. How are memory addresses stored in references? Where is it stored? Thanks

給我你的懷抱 2017-05-27 17:40:20 0  1  717

c++ - A question about static_cast

The static_cast operator converts expression to type-id type, but there is no runtime type checking to ensure the safety of the conversion. ① Used for conversion of pointers or references between base classes (parent classes) and derived classes (subclasses) in the class hierarchy. Perform upcasting...

阿神 2017-06-05 11:11:51 0  1  958

When declaring a class in PHP, how is this class stored in memory?

I searched for some information on the Internet, but they all talked about how instantiated objects are stored, and did not mention the methods in the objects or the storage of classes in memory. Please enlighten me, thank you!

PHP中文網(wǎng) 2017-05-16 13:06:28 0  1  431

How to pass class-defined variables to class methods in PHP?

I want to pass the value of a variable I defined in a class to its method. I know I can set a default value using the = symbol in the parentheses of the method, but this seems redundant since I already have the variable defined. Is this possible? classCar{var$num_wheels=4;var$model="BMW";f...

P粉436688931 2023-09-13 21:12:48 0  1  688

Add search bar to filter data within entity type fields in symfony6

I have a problem, I want to filter the output data in this entity type I found a solution but I should change the value of searchterm inside the script, $searchTerm='ri';$builder->add('userInput',EntityType ::class,['class'=>User::class,'query_builder'=>function(EntityRepository$er)use($se

P粉078945182 2024-04-03 21:32:53 0  1  618

springboot - Why is the spring-data-redis library so troublesome to use? You have to write a serialization class once for each class. Did I use it wrong??

Declare the serialization class {code...} that handles a certain type (BaseCurrentUser) and use {code...} in the service class. Then every time I add a type of storage, I have to add a set of @Bean??? Yes Is this so? Or I don’t know how to use it? Or I don’t use it this way, just use its StringRedis...

伊謝爾倫 2017-06-28 09:27:25 0  1  1324

The rewritten title is: How can I simulate the Symfony mailer for testing purposes?

I'm using the Symfony mailer in a custom class in a Symfony6 project. I'm using autowiring via type hints in the class's constructor like this: classMyClass{publicfunction__construct(privatereadonlyMailerInterface$mailer){}publicfunctionsendEmail():array{//Emailissentdownheretry{$thi

P粉739706089 2023-12-13 09:42:22 0  2  708

java - How to deal with the problem that the front end needs to be displayed, but the database table does not have the redundant attribute of the entity class for this field?

There is a SiteAlarmRecord entity class, corresponding to the SiteAlarmRecord table, and its information needs to be displayed in the frontend. This entity class has an attribute called alarm type. The data stored in the table is code, but the front desk needs to display the name code name correspon...

滿天的星座 2017-05-16 13:38:16 0  1  750