If you check the window outerwidth on a maximised browser window, you should get the resolution width of your screen or display in general. For example when I run the following code (in console) in Firefox I get 1920px which is my resolution width: window.outerWidth 1920 On Google Chrome however, the reported dimension is different… Read More »
In production database setups, mysql replication is commonly used to duplicate a single database over many database servers. The primary database is referred to as the master database, while the other replicated databases are referred to as slave databases. To put it another way, we can use it to duplicate a database. Replication is used… Read More »
PyOpenGL is an python module that implements OpenGL functions in python allowing you to write OpenGL applications using Python. With OpenGL you are able to write applications that use “GPU acceleration”. So if you have an Nvidia RTX 3060 gpu on your system, the opengl functions will use it to render the 3D graphics on… Read More »
Xdebug is a powerful debugging and profiling tool for php that allows you to find and fix errors faster by showing the entire stack trace and source code file and line number. If you want your php development to be error free you should use something like xdebug right from the beginning. A very useful… Read More »
wxWidgets is a cross platform gui library for developing native desktop apps. This quick tutorial shows you how to compile and install it on Ubuntu, Debian and Linux Mint
This tutorial shows how to code a simple tcp/ip socket server in python using low level socket api.
Output Buffering Output buffering is processing mechanism where the output being generated by a program is held in a place till its size reaches a limit or the generation is complete. Only after, will the output be send to its destination. In php for example, doing and echo generates some output. Now this output might… Read More »
Php set_time_limit Php has a function called set_time_limit which can be used to dynamically adjust the maximum execution time permitted to a script. It allows specifying the time in seconds and limits the script execution time to that many seconds. The set_time_limit function whenever called, effectively extends the script execution time by that many seconds…. Read More »
Database schemas Databases are present in almost all kinds of application that need to store information in some form or the other. Web applications like blogs, cms, social networking sites or business applications etc all have a database along with the code. The database design or schema determines how the tables and their relationships are… Read More »
Socket based chat application In our previous article on we learned about the basics of creating a socket server and client in python. In this post we are going to write a very simple chat application in python that is powered by sockets. The chat application we are going to make will be more like… Read More »
The telnet client is a simple commandline utility that is used to connect to socket servers and exchange text messages. Here is an example of how to use telnet to connect to google.com and fetch the homepage. $ telnet google.com 80 The above command will connect to google.com on port 80. $ telnet google.com 80… Read More »
ICMP Ping Flood A ping flood program sends a large of icmp packets to a remote host to flood the network and system resources on the target system. The target system keeps replying to the icmp packets and its system resources are consumed un-necessarily. In a previous article on we saw how to construct raw… Read More »
ICMP Ping Flood Icmp ping flood is a kind of DOS attack that can be performed on remote machines connected via a network. It involves sending a large number of ping echo requests (packets) to the target system such that it is not able to tackle so fast. So the result is that the host… Read More »
Communication over sockets involves 2 programs running on the same machine or on separate machines across a network. First is a socket server and the other is a socket client. Tcp stands for Transmission control protocol and it is the most common protocol being used for most of the network communication that takes place over… Read More »
SOAP and PHP SOAP is a protocol to exchange objects over http. It is used to implement apis and the data being exchanged is in xml format. Sometimes it might be required to modify the soap request to add custom http headers for example. Since SoapClient is a class, it can be extended and the… Read More »
When loading xml files in php through simplexml_load_string or domDocument class, sometimes an error like this might popup Warning: DOMDocument::loadXML(): Input is not proper UTF-8, indicate encoding ! OR Warning: simplexml_load_string(): Entity: line 93: parser error : Input is not proper UTF-8, indicate encoding ! The error occurs when the xml has some invalid characters… Read More »
The file_get_contents function is often used to quickly fetch a http url or resource. Usage is very simple and appears like this $content = file_get_contents('http://www.google.com/'); However the file_get_contents does not get the contents compressed. It requests the server to send everything in plain text format. Most websites are capable of serving compressed content, if they… Read More »
Socket Programming Socket programming involves connecting to remote machines on LAN or over the internet using ip addresses and port number. For example google.com has an ip “173.194.36.3” and runs http server on port 80. So a socket application can connect to that ip address on that particular port number and start data communication. Socket… Read More »
In your web application you might need to parse the user’s user-agent string to find out the browser/OS/device being used. This is necessary specially when your webapp tries to adapt to the user’s platform in a better way. For example a different layout for mobile device or restricted features/graceful degradation on a non supporting browser…. Read More »
The filter_var function of php is capable of validating many things like emails, urls, ip addresses etc. It does not have a direct option to validate a domain name however. So I coded up this little snippet that the filter_var function with a little tweak so that it can validate domain names as well. function… Read More »