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I would like to ask: Why does PHP only calculate the addition of two pieces of data? How can you find the sum of all numbers?

This is the template of finecms. There is such a loop, which displays the transaction information posted by members. Each information has replies from other members. This reply contains the amount, and an operation is written in PHP (just for display, (not written to the database), but it only calcu...

刘畅 2020-08-31 18:35:16

How to solve the problem of not being able to access the $_POST value when using the $.post method

I'm having a lot of trouble sending data from one page to another. I'm developing a movie website that displays movies on the homepage and when I click on a movie I want to access the movie details page with reviews. In fact, I want to send the movie ID to the movie-detail.php page because I want to...

P粉043432210 2023-08-15 11:51:39

Update the calculated properties of a parent component after the child component modifies the prop data

I need to make a relatively complex API request object with a large number of UI components responsible for updating different properties of the object. I pass the basic request model as a prop from the parent component to its child components, and the child components pass it to their components (a...

P粉633733146 2024-02-26 11:56:21

How to pass what a function calculates as a variable

How can I pass what the function calculates into a variable. {code...} As shown in the code, I use this calculation to output the image address I want, and then display the image on the page through the following code {code...} But how do I pass the content calculated by the first code to Second par...

天蓬老师 2017-06-26 10:55:07

Using date-fns with Firestore server timestamps

I'm trying to format my Firestore server timestamp in ReactNative using https://date-fns.org/ I found this example function formatDistance(subDays(newDate(),3),newDate(),{ from the documentation addSuffix:true}) I assume formatDistance has two parameters. The date I calculate is also the current dat...

P粉035600555 2024-03-30 17:37:10

Use methods from apply

To find the maximum value of an array, a simple way is Math.max.apply(null,myArray) However, assuming myArray contains complex numbers and each complex number has a method magnitude to calculate the length of the complex number, is there a simple way Can I find the maximum value of entries in myArra...

P粉718730956 2024-04-03 21:41:46

Achieve enhanced composition and responsiveness with Vue.js 3.

Given the following combined 'useNumbers.js' in Vue.js 3, I want to make 'numbers' responsive in the component. However, adding a new value to 'numbers' in one component will not be reflected in the second component. useNumbers.js: import { ref } from 'vue'; export default function() { const...

P粉935883292 2023-08-03 15:58:35

PHP wants to use queues to export very large data from the database and download it. How to achieve this?

Using PHP, there are millions of data in the database, but it cannot be found directly. It also requires complex calculations and exporting after calculation. So I want to use queues to solve this problem, or there are other ideas. And you can use ajax to monitor queue execution. Note: It doesn’t ha...

阿神 2017-05-24 11:34:20

A python novice wants to make a code that can calculate pi, but I don't know how to write it.

I wrote a piece of code that can calculate the factorial of a number, as follows: {Code...} Here, change while i <=50 to any number, and you can calculate any factorial, or change it to while True. into an infinite factorial. My question: Currently I want to follow this idea and write a parag...

高洛峰 2017-06-12 09:21:09

How to increase the number of icons based on data in Vue

I sent an API request and got a different number of participants (from 1 to 5). Based on this number, a corresponding number of icons should be displayed in the modal box. If there are 3 participants, there should be 3 user icons in the modal. I know how to do it in React, but I'm starting to learn ...

P粉832490510 2024-01-10 17:03:43

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

Mailto link using computed property not loading full message body

The mailto link loads the recipients and subject correctly, but seems to truncate the email body to a very short length. My email has a total of 1500 characters, so it's under the mailto limit. The body of the email appears to be truncated at approximately 200 characters. I'm appending a computed pr...

P粉811349112 2023-12-07 19:05:55

Retrieving the width of an element when using inline JSX rendering in a return statement

I have an element and I want to calculate its width and then iterate how many times it takes to at least fill the width of the viewport. The problem is, I can't get the width via the inline JSX render style I'm using. Even if I set it as a dependency, I still get the refWidth is empty error in useEf...

P粉441076405 2023-09-20 22:00:52

Revised title: Calculate total based on checkbox selection

I'm developing a simple financial tracking application. In the application, there is a table with all the expense bills and then the total amount located outside the table. I'm trying to find a way using JS or AJAX so that when I select 1 checkbox in a table row I can include/exclude a bill from the...

P粉360266095 2024-04-04 13:45:50

js find child node img and change src

{Code...} Now the image src is changed when the mouse stays on the img. I want to add the Onmouse attribute directly to the a link. How to find the node of this img and change the src of the img. Thank you {code...}

phpcn_u1582 2017-05-18 10:50:30

Find year range for Mysql REGEXP

I want to separate the content in a table on my movie website based on year intervals, but no matter how hard I try, I can't succeed. Actually what I want is to list movie files before 1950. I don't know if I made a syntax error because I'm a beginnerAMovie1910BMovie1920CMovie1930DMovie1940EMovie195...

P粉545910687 2024-04-01 14:26:29

I encountered some difficulties when developing the WeChat applet calculator. There is an error that I can't figure out, but it seems to be the same as what is written in the video. Please give me some guidance.

I encountered some difficulties when developing the WeChat applet calculator. There is an error that I can't figure out, but it seems to be the same as what is written in the video. I would like to ask for guidance. For example, if you enter: "7+7", the result will be displayed as 14 norma...

会玩的白先森 2018-03-24 16:43:36

How to sum elements of a specific person (id) - laravel

Hi, how can I sum a table column for a specific person(id). For example, I have a table like this (this is the table ProjectHistory table): I want to show all the sums for a specific collaborator in my colabs view, for example see the image below. (This is the collaborators table) So, if you look at...

P粉450079266 2023-09-04 16:39:02

Pass arguments to a specific function in a PHP file on the server side (from JS) and return the result to the JS function that called the function

Basically what I'm doing is creating a graphing calculator (using BokehJS) that currently takes some input via html, then javascript reads the data and does the calculations, then outputs the resulting graph. The problem is that we don't want the user to be able to see all the calculation code. It w...

P粉593649715 2024-01-16 22:27:27

mysql - How to write two SUMs with different conditions in a sql statement and find the difference between the two

The table I use in my business is the user's points log table. The fields are user id, point type (added to 1 and reduced to 2), points, and timestamp. I need to calculate the total points of the user every day. I initially summed the points separately. Divide and subtract points, and then loop the ...

阿神 2017-05-24 11:33:10