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Adding if(empty(USER_ID)) makes an error

update time：2017-09-08 18:53:14
1994Page View3 answers

Please read what I wrote, is this right? ?

update time：2017-07-27 18:05:18
1994Page View7 answers

Can anyone give me some instructions on this assignment?

update time：2017-06-02 10:30:36
1993Page View6 answers

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

update time：2017-05-16 13:02:26
1991Page View3 answers

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.

update time：2017-05-24 11:32:12
1989Page View2 answers

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

update time：2017-09-04 16:03:55
1988Page View1 answers

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?

update time：2018-09-05 11:14:15
1987Page View0 answers

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

update time：2017-11-27 14:27:35
1987Page View2 answers

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

update time：2017-08-29 08:02:14
1986Page View7 answers

How to write this verification rule?

update time：2017-09-09 10:00:48
1984Page View2 answers

What is the difference between gettype and var_dump?

update time：2017-11-20 15:45:15
1984Page View2 answers

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

update time：2020-12-21 15:09:28
1983Page View1 answers

Personal Alipay uses H5 to enable payment

update time：2019-07-16 13:43:30
1981Page View1 answers

Why can't index.php be omitted in domain name access?

update time：2018-03-02 11:36:09
1979Page View9 answers

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

update time：2017-11-20 11:10:33
1979Page View2 answers