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  1374

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  1471

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  626

How can a function within a function call a variable of the parent function?

var_dump(function_exists('b')); // false function a(){     $var = 123;     function b(){      &nb

喵~ 2022-12-05 19:48:12 0  0  617

PHP code to write a function to find the correlation coefficient?

PHP code to write a function to find the correlation coefficient?

时光正好 2018-04-12 19:02:34 0  0  905

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  817

PDO columnCount function

Is it possible to use the columnCount function to calculate the number of returned results? This function directly returns the number of query result columns. If not, it returns 0.

**军 2019-07-09 09:59:52 0  2  1148

javascript - How to bind a callback function to a variable

Can Javascript bind a callback function to a variable? That is: when the value of this variable changes, the callback function is triggered and the content in the callback function is executed.

高洛峰 2017-06-26 10:53:29 0  3  907

javascript function

{Code...} Why does the above code output 1? After foo() is run, this is output. This is the window object. Does the getName in foo() also become a global function expression? And The following var getName is also a function expression; why the printed result is 1; foo,...

给我你的怀抱 2017-06-26 10:53:22 0  6  767

length attribute in js function

For custom functions: function fun(a,b) { {code...} } Print the window object in the chrome development tool and find that there is a custom function fun and its own function getComputedStyle. The formal parameters of the fun function are Two, so the length attribute is 2, and the getComputedStyle f...

曾经蜡笔没有小新 2017-06-14 10:53:55 0  2  981

ES 2017: async function vs AsyncFunction object vs async function expression

I just read about async functions and found some similar features for ES2017. It's causing a lot of confusion, and I just want to ask: What's the difference between asyncfunction, AsyncFunction (used to create an async function), and an async function expression (which I think is just another async ...

P粉459440991 2024-03-25 23:44:59 0  1  408

function

If you declare a function say(); and then var a = say; is the address or value of say passed to a at this time?

巅峰之前 2019-09-17 09:35:44 0  2  1280

javascript - The relationship between callback functions and closures

Does the callback function use the closure feature? For example: {code...}

伊谢尔伦 2017-07-05 10:54:10 0  2  998

javascript - When adding a new function to a function, should you choose to extend the original function or create a new function~

If you extend the original function, you have to add parameters and if. This causes more judgment when using the normal function. I am not happy. When I create a new function, I declare a piece of memory for it, which consumes more memory~

ringa_lee 2017-05-19 10:23:44 0  2  536

What is the difference between functions and variables?

What is the difference between functions and variables? Why appear together? Functions and variables, all of them are faint.

武汉蜗牛 - Jack Li 2019-09-08 11:38:24 0  8  2472

How does a js external function call the object in the callback function?

!function(a,b){ f = b();//Here F is the object }(this,function(){ ....... ....... }) function e(){ //How to call the object F in the function e //for example &

按键盘手指磨破皮 2020-04-09 18:07:44 0  1  1013

javascript - How does the callback function access the value under the current function?

I defined an array variable in the function, which contains 6 elements, and then called the callback function in the function. The value of the array variable cannot be accessed in the callback function, but the length attribute can be accessed. I feel very confused and don't know how to solve it. {...

大家讲道理 2017-05-16 13:35:48 0  4  558

Related usage and functions of the FOUND_ROWS() function in MariaDB 10

I have a function that needs the number of rows returned via a select statement. After some searching, I found the FOUND_ROWS() function. But I don't think it works: SELECT*FROMtipfirmeLIMIT20;SELECTFOUND_ROWS(); because it always returns 1 as the value found. However, if I run it in one line, it wo...

P粉670838735 2023-08-28 17:39:42 0  1  469

javascript - Function to count the number of words?

Numbers, letters, and space symbols represent one digit, and Chinese characters represent two digits. How to write a function to calculate the number of digits?

阿神 2017-05-19 10:13:45 0  2  836

java - Multi-interface function reuse?

There are multiple activities in my application, and each of these activities has the same custom combination control, and the functions called by the combination control are the same, but these functions are dependent on the activity. Is there any way to associate that custom combination control wi...

伊谢尔伦 2017-06-05 11:10:46 0  1  591