PHP nested function and anonymous function scope issues

{Code...} All functions and classes in PHP have global scope and can be defined within a function and called outside it, and vice versa. Why can function b obtain the local variables of function a by passing parameters? {Code...} Similarly, why does the anonymous function also obtain external variab...

phpcn_u1582 2017-05-18 10:45:34 0  1  642

javascript - Questions about function closures and passing functions as parameters

1. Description: I want to get a function array result. First, the func function adds an anonymous function to the array result (each anonymous function saves its own num). But I pass in the anonymous function after return with parameters, which is equivalent to just It's just a replacement, why are ...

世界只因有你 2017-06-26 10:50:31 0  3  836

function namespace

The name of Wukong b function is: b\hello This is the output result. Can you not output b b\hello ? Directly output Chinese characters!

张磊 2019-02-13 19:37:42 0  0  1006

python - How to pass parameters to a module, the parameter is the function name of the module?

I hope to execute multiple functions in the module by passing parameters. For example: there are functions daifu, jiekuan, tixianimport in the tb module tbtb.daifu.save(os.path.join(args.savedir, xlname)) directly write the module. The form of the function name can be called. But if you pass the val...

扔个三星炸死你 2017-06-12 09:26:33 0  1  953

c++ - How to define a macro in C to obtain the function name through a function

How to define a macro to obtain the function name string, as follows: {code...}

阿神 2017-07-04 13:45:23 0  1  1426

Question about anonymous functions

var a=function(x){return x*x;} What does a mean that can be put into other functions to operate? Is it called or introduced? Can you give an example?

MrSwan 2018-04-20 12:23:51 0  1  1688

How to determine $func in $func($arr) as an anonymous function

How to determine $func in $func($arr) as an anonymous function

江湖再见 2023-05-05 21:28:00 0  0  577

c++ - Can functions with the same name with different parameters in a derived class be declared as virtual functions

When the base class and the derived class have functions with the same name, regardless of whether the number of parameters is the same or different, the subclass object will always directly call the function of the same name of the derived class. If you want to call the function of the same name of...

世界只因有你 2017-06-10 09:48:57 0  1  1334

javascript - Three ways to write js anonymous functions

The following is the anonymous function of JS. What are the differences between these three forms and what are the characteristics of each? {code...}

漂亮男人 2017-05-19 10:39:41 0  3  582

Laravel: Custom functions using namespaces

Is it possible to put my helper function in a namespace? My current setup (which I can't get to work) is: app\Helpers\simple_html_dom.php:<?phpnamespaceApp\Helpers\HtmlDomParser;functionfile_get_html(){echo'file_get_html()called';}composer.json "autoload":{&qu

P粉561323975 2024-03-27 23:28:51 0  2  459

TP5.1 Implement search function in multi-table related query

Problems with the multi-table associated search function: The code is as follows: // Implement the search function $productName = Request::param('productName'); $storeName = Request::param('storeName'); if ( !empty($productName) &a

Jackie 2020-06-16 22:43:38 0  4  1924

When JavaScript declares a variable in the global object, it will become a property of the same name of the global object, but when it is declared in a function, it will not. Why?

In JavaScript, after a global variable is declared globally, it becomes a property of the global object with the same name. However, after a local variable is declared in a function, it will not become an attribute of the function (object). Instead, it must be declared using "function name.attr...

仅有的幸福 2017-06-26 10:58:35 0  7  933

javascript - js anonymous function related issues

{Code...} A small problem I encountered myself, I don’t know if you have it. I like to write anonymous functions recently. When I first saw this, I habitually looked at it backwards, thinking that it just exposed obj. , why can sayHi be executed when sayHello is executed? Thinking of seeing the oper...

怪我咯 2017-07-05 10:50:25 0  2  997

Vim status bar shows wrong function name

I installed the Powerline plug-in, and when writing PHP code, the status bar will display the current function name; however, there is a problem and it is not accurate. Does anyone know how to solve it?

巴扎黑 2017-05-16 16:41:41 0  1  724

Is the setlocale() function in PHP invalid for Chinese?

Environment: CentOS 7.3.1611PHP 7.1.3 Code: {code...} Output: {code...} Another test, in Shell: {code...} Question: Is it possible to output local date in Bash ized. But why is it invalid to use the setlocale() function in PHP? Please ask experts for advice.

怪我咯 2017-05-24 11:33:31 0  3  948

mysqli function

When using mysqli_num_rows() and other functions in the TP5.1 framework, an error will be reported. Can these functions not be used on TP?

林瑞程 2019-09-07 21:00:50 0  5  1389

Run an async function on React return

I'm trying to display a username from a Firebase database in a React return function. I have a function called getUserName which retrieves the username from the database and returns it. constgetUserName=async()=>{try{constdocRef=doc(db,"users/"+auth.currentUser?.uid);constuserDocument=a...

P粉545682500 2023-09-07 17:31:08 0  1  538

functionunset()

The tutorial says: 3. Use the function unset() to destroy the variable, but the code demonstration uses var_dump(); are unset() and var_dump() the same function? Address: //m.sbmmt.com /code/985.html

Rebecca 2022-10-19 11:04:45 0  1  1480

When javascript function declaration is promoted, will the function body be promoted together?

When javascript function declaration is promoted, will the function body be promoted together? If not, there are the following counterexamples: {Code...} If yes, there are the following counterexamples: {Code...} The first example shows that the function body is also promoted. If you follow this ide...

PHP中文网 2017-05-19 10:43:15 0  10  736

Uncaught TypeError: $ is not a function

<script type="text/javascript"> layui.use(['layer'], function(){ $ = layui.juqery;  layer = layui.layer; }); function dologin(){ var username = $('#

zhanghang 2018-03-28 23:53:04 0  2  1807