What is WordPress Pingback/Trackback?
As a savvy spammer, I know how to get backlinks from WordPress websites to my site. The simplest way is to comment on posts on other wordpress sites , leaving […]
How to check the version of wordpress installed without login?
You must know a way to check the WordPress version, i.e., login administration dashboard. The version of installed wordpress is shown somewhere on the home page of the administration dashboard. […]
http request headers for firefox, edge, and qtwebengine
An http request issued by firefox has the following headers. GET / HTTP/1.1\r\n Host: google.com\r\n User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:69.0) Gecko/20100101 Firefox/69.0\r\n Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\n Accept-Language: en-US,en;q=0.5\r\n Accept-Encoding: […]
How to add a button onto toolbar in Qt Designer
Like other components of Qt, Qt Designer also proves the whole Qt stuff is developed by some amateurs. When you create a Qt widget project in Qt Creator, you are […]
php append to file
I like php’s file_put_content function, which can write a string to a file with single line of code: file_put_content(“file.txt”,”content”); Few languages have such powerful function. In C language, you need […]
qDebug no output on CentOS
The qDebug()<<“aaaaa” is working perfectly on Windows, but when I compile the same program on CentOS, it suddenly stops working. I cannot see anything displayed on the console. Why qDebug […]
Qt random number
The random number generation functions are always confusing. We often use the C rand() function to generate an integer number between 0 and RAND_MAX. We call it several times and […]
Warning: mysqli_stmt_bind_param(): Number of variables doesn’t match number of parameters in prepared statement
How to bind to variable number of variables in mysqli_stmt_bind_param() in one statement? mysqli_stmt_bind_param() itself can accept variable parameters. The prototype of mysqli_stmt_bind_param is: mysqli_stmt_bind_param ( mysqli_stmt $stmt , string […]
difference between null QString and empty QString
A null QString is an uninitialized QString while an empty QString is a QString initialized with an empty string(reference). QString s1; QString s2(“”); if(s1==s2) qDebug()<<“same”;//same else qDebug()<<“not same”; qDebug()<<s1.isNull();//true qDebug()<<s1.isEmpty();//true […]
wordpress image attachment
WordPress image attachment is a little complicated thing. In a post that is inserted an image attachment, you can edit some attributes like alt text, height, width of the inserted […]