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There is a problem with data validation

There is a problem with my data validation. When each field is empty, it prompts "Username cannot be empty." In addition, when all fields have values, it also prompts "Username cannot be empty." What is the reason?

Jackie 2019-10-03 23:55:41

php data acquisition?

php data acquisition? php data acquisition? php data acquisition?

Mr.V 2017-07-27 21:56:28

php - When compiling and installing the lnmp environment in Linux, does the GD library need to be downloaded and installed separately?

PHP has its own gd library, but during compilation and installation, do you need to download and install the gd library separately? Or can you just use the one that comes with PHP? However, many people on the Internet do not directly use PHP's GD library, but download GD separately. Install.

大家講道理 2017-05-16 12:57:59

How to use php+mysql to make dynamic data tables, urgent! ! !

How to use php+mysql to make dynamic data tables, urgent! ! ! How to use php+mysql to make dynamic data tables, urgent! ! ! How to use php+mysql to make dynamic data tables, urgent! ! ! How to use php+mysql to make dynamic data tables, urgent! ! ! How to use php+mysql to make dynamic data tables, ur...

joer 2021-05-12 02:06:09

javascript - axios upload data to php returns empty

1.vue 2.0 uses axios to upload data and returns empty, and the background is php 2.vue code {code...} 3.php code {code...} 4.console returns data {code...} 5. Remarks get Obtaining data is valid. For some reason, post submission data cannot be obtained on the php page, and the return is empty, htm.....

過去多啦不再A夢 2017-06-20 10:05:38

How to get the last offset in a topic from Kafka using php library?

I'm writing a Kafka consumer for an API project using the php-rdkafka library. I need to find the last offset in the topic and get the value from it for further processing. For example, last offset in topic = 5, then I need to get offset 5 and send it through API until new offset is added. What I'm ...

P粉763662390 2023-09-10 11:00:45

Missing newline characters while getting data from PostgreSQL database using PHP

Title: Missing newline characters when getting data from PostgreSQL database using PHP Text: When I use PHP to get data from a PostgreSQL database, I encountered a problem. I use Navicat to view the data in the database, and I can obviously see the newlines (\n) in the data.

P粉696146205 2023-08-06 13:44:42

html form data cannot be submitted to php

The source code is as follows. When submitting data in the HTML interface, PHP does not display <html> <head> </head> <body> <?PHP $name=$

P粉493736411 2022-12-24 13:59:25

How to return and update data in PHP

After modifying the form with PHP, use <script type="text/javascript">window.history.go(-1);</script> after submission. The database modification is successful, but the original data is still displayed after the page is returned, and it needs to be refreshed manually. New data ...

P粉726632954 2022-11-07 14:30:56

php get web page data

I want to write a web page data collection with cookies. I don’t know how to write PHP. Can anyone explain the collection URL = “https://steamcommunity.com/tradeoffer/new/partnerinventory/?sessionid=29475e48124c520cf70060dc&partner=76561198124311480&appid=433850&contextid=1

呂大大大大大 2017-07-21 18:06:59

How to search and filter data in a table using PHP?

I want to search and filter data in a table but I don't know how to do it as I'm currently learning php. This is my php script for searching the data <?phprequire('./conn.php');if(isset($_POST['search'])){$valueToSearch=$_POST['query'];// searchinalltablecolumns//usingconcatmysql<function>&...

P粉287726308 2023-12-29 14:08:25

How to save session-related data in php jwt?

How to save session-related data in php jwt? For example, in the session, the data related to this session can be saved in the session, and it will be directly taken out and used through the session next time.

過去多啦不再A夢 2017-05-16 13:16:45

How to query only one piece of data using Ajax and MySQL in PHP instance?

http://www.runoob.com/php/php... Why only one piece of data is displayed after using this example operation, and how to display all data that meets the conditions. For example, the query field I use is yesterday_str, and the query is 2017-04 -18How can this data include 2017-04-18...

我想大聲告訴你 2017-05-16 13:09:21

javascript - Add multiple pieces of data organized into an object and pass it to php. How does php receive the parameters and parse them into normal data and insert them into the table?

I made a table for adding, deleting, modifying, and querying. There are many new pieces of data. Now I always use ? in the URL. Pass it to php in the form of appended parameters, and then php uses $_GET[''] to receive the passed parameters. This is a way to add new data. What I want to ask is, if th...

阿神 2017-05-16 12:59:35

php - How to ensure data security when one operation requests multiple services?

An order operation to purchase goods. To simultaneously reduce user points, insert an order. In the same library, pessimistic locking can be added to the points table to prevent concurrently generated data from being read multiple times. Now that HTTP is used to request points service and order serv...

我想大聲告訴你 2017-05-25 15:08:18

How does the PHP source code crawl data by customizing the interface to obtain the proxy IP?

How does the PHP source code crawl data by customizing the interface to obtain the proxy IP? How does the PHP source code crawl data by customizing the interface to obtain the proxy IP?

chen 2022-11-04 23:36:05

Rendering data in a table using jQuery in PHP

I have a data and I use PHP to access them. So I created a simple button and when I click it my program needs to create a table containing the data. Below you can see the jQuery code that reads the data and creates a table. But the problem is, I can't access every element in DATA. I want to clarify ...

P粉894008490 2023-09-04 09:54:29

Obtaining data from PHP file returns null value

I'm trying to test and learn how fetch works, so I want to send some data from javascript to a php file, my problem is that I can't retrieve the data (in the php file), I just get null in response. I'm using POST but I tried using GET and got the same result as a side note, in the console the connec...

P粉617237727 2023-08-30 11:20:14

Can PHP do data processing related to principal component analysis?

I want to make a management information system for managing data. I don’t know if PHP can implement related functions, or if I can call external programs to implement PHP, I am still very basic. I hope you guys can give me some guidance.

YOSIN_L 2019-02-14 16:25:42

The verification rule keeps popping up that the user name is empty?

$status = 0; $result = ''; $data = $request->param(); //Validation rules $rule=[

brother_water 2017-08-15 22:18:29

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