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Please how to solve this: Note: Undefined index: id in D:\phpStudy\WW\Student Management System\edit.php on line 13 Note: Undefined index in D:\phpStudy\WW\Student Management System\edit on line 18 Cannot convert object of class mysqli_result to int in .php

<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <t...

From [PHPdiscussion group] 2017-11-21 16:20:04

Please read what I wrote, is this right? ?

foreach( $arr as $k => $v ){ echo '<h4>' .$k .'</h4>'; &nbs...

From [PHPdiscussion group] 2017-07-27 18:05:18

Can anyone give me some instructions on this assignment?

http://www.php.cn/code/1084.html Can anyone give me some instructions for this assignment? It cannot be comple...

From [PHPdiscussion group] 2017-06-02 10:30:36

phpstudy："5500 xxxx" is not a valid integer value

From [PHPdiscussion group] 2017-08-29 08:02:14

php - In the rsa encryption algorithm, if the client's public key is leaked, is there a security risk?

After the public key in RSA is known to a third party, the third party uses the public key to encrypt and send...

From [PHPdiscussion group] 2017-05-16 13:02:26

LAMP configured in the Pagoda panel, when uploading thinkPHP, the error "File not found" is reported when accessing, and when .htaccess is modified, the resource cannot be loaded.

I am a novice. I used LAMP configured in the Pagoda panel and uploaded thinkPHP 3.2.3 (the code is available f...

From [PHPdiscussion group] 2017-05-24 11:32:12

Verification code generated using think-captcha in thinkphp5 is not displayed

The verification code generated using think-captcha in thinkphp5 does not display. The generated verification ...

From [PHPdiscussion group] 2017-09-04 16:03:55

According to the video, how to solve the problem of 40029? It is all PHP download sdk. Which code was changed? Is it used twice?

public function GetOpenid() { //Get openid through code if (!isset($_GET['code'])){ //Trigger WeChat to return...

From [PHPdiscussion group] 2018-09-05 11:14:15

Today, when using PHPstudy to configure nextcloud, it is always Forbidden. Please help me.

In the site directory, other folders can be accessed smoothly, but the nextcloud folder appears Forbidden when...

From [PHPdiscussion group] 2017-11-27 14:27:35

How to write this verification rule?

Suppose you want to verify whether a date field is between a certain date and today. What is the simplest way ...

From [PHPdiscussion group] 2017-09-09 10:00:48

What is the difference between gettype and var_dump?

<?php$float=88.8;$type=gettype($float);echo $type.'<br />';$var=var_dump($float);echo $var.'<br /&...

From [PHPdiscussion group] 2017-11-20 15:45:15

Design a user class USER. The variables in the class include user name, password and variables that record the number of users. Define class constructors, getters, and setters

Design a user class USER. The variables in the class include username, password and variables that record the ...

From [PHPdiscussion group] 2020-12-21 15:09:28

Personal Alipay uses H5 to enable payment

Personal Alipay uses H5 to initiate payment. Personal Alipay uses H5 to initiate payment. Instant payment is m...

From [PHPdiscussion group] 2019-07-16 13:43:30

In the thinkphp5 course, using paginate() in the controller prompts that the attributes of the class do not exist.

Video tutorial http://www.php.cn/course/631.html In Chapter 5, Section 3, use pagination to display classifica...

From [PHPdiscussion group] 2017-11-20 11:10:33

sql语句中加上一个负数怎么写？

$sql ="update lzh_cds_items set ci_fetch_num = ci_fetch_num+(-20)";这么写...

From [PHPdiscussion group] 2017-02-27 15:53:45

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