What are callbacks Callback is a piece of code that is passed to some other functions as a parameter, such that it can be executed before or after a certain event or change of state. A common example of callbacks can be seen in javascript when using the jquery ajax function. $.ajax({ url: 'ajax/test.html', success:… Read More »
The idea behind serializing a variable is to create a storable string format of it, such that the same variable can be recreated later when required using the string. 1. serialize and unserialize These are the traditional functions to serialize and unserialize data in PHP. $a = array('a' => 'Apple' ,'b' => 'banana' , 'c'… Read More »
Github Login Github has become a very popular social login on websites related to programming and development. Github itself is a big storehouse of opensource projects and community of developers. Github oAuth documentation can be found at http://developer.github.com/v3/oauth/. Register website with Github oAuth The first thing to do would be to register your website with… Read More »
Yahoo OpenId In the previous article, we learned how to integrate . Its good to know that Yahoo is also an openid provider and “Login with Yahoo” can be added to a website in a very similar manner. Yahoo’s openid discovery url is http://me.yahoo.com/. The rest of the code is very simple. Code <?php /*… Read More »
OpenId A very popular login method now a days is to allow users to login through their google, openid etc accounts. One popular protocol being used is the OpenId. According to wikipedia : OpenID is an open standard that describes how users can be authenticated in a decentralized manner, eliminating the need for services to… Read More »
How to setup a jailed shell on Ubuntu using jailkit.
Quick guide on how to compile and install jailkit on Ubuntu/Debian based linux systems.
Clientside certificates are often used in soap webservices. For example the wsdl file link might require a clientside certificate. The server throws an error like this : HTTP Error 403.7 – Forbidden: SSL client certificate is required. Curl Command To use clientside certificate with curl , test the following command curl –cert certificate_file.pem https://www.example.com/some_protected_page or… Read More »
Bsnl has plenty of high speed (4 MPBS) plans as mentioned here : http://bsnl.co.in/opencms/bsnl/BSNL/services/broadband/new_BB_postpaid.html . These are on the NIB – II Network. Ip addresses begin with 117. One known problem with the high speed internet is that it gets disconnected frequently. So like Yahoo Messenger or Pidgin or Skype could go offline every 5… Read More »
Phpmyadmin auto login Phpmyadmin is a popular web based mysql database administration tool/frontend. It is used widely by php/mysql developers to manage database locally and remotely. When logging in to phpmyadmin, the user has to provide the mysql login credentials. However when working or developing on localhost , its better to make phpmyadmin login automatically… Read More »
Localisation Localisation involves changing various parts of application output like display of dates , time , numbers , language etc according to the standards of the geographical region of a user. Localisation is an important feature of applications that targets users across the globe and not just one region. So here are a set of… Read More »
Part 2 26. Avoid direct SQL query , abstract it $query = "INSERT INTO users(name , email , address , phone) VALUES('$name' , '$email' , '$address' , '$phone')"; $db->query($query); //call to mysqli_query() The above is the simplest way way of writing sql queries and interacting with databases for operations like INSERT, UPDATE, DELETE etc. But… Read More »
Part 1 11. Do not gzip output in your application , make apache do that Thinking of using ob_gzhandler ? No dont do that. It doesnt make sense. Php is supposed to write your application. Dont worry about how to optimise data transfer between server and browser inside Php. Use apache mod_gzip/mod_deflate to compress content… Read More »
Php is used to write web applications which are online and publicly accessible. Therefore security is a fundamental necessity of these applications to keep the data safe and free from unauthorized access. Below are a bunch of simple tips/hacks/ideas to design your php applications to have better security. The Code 1. Avoid short tags If… Read More »
In this series we are going to look into some useful tips and techniques that can be used to improve and optimise your php code. Note that these php tips are meant for beginners and not those who are already using mvc frameworks etc. The Techniques 1. Do not use relative paths , instead define… Read More »
Like any other language php applications often need to execute system commands like they are run from the terminal/console/commandline. Php has multiple functions to do this task. Lets take a look at each of these 1. system “system() is just like the C version of the function in that it executes the given command and… Read More »
On linux , the list of locales installed on the system can be fetched through the terminal command locale -a : $ locale -a C C.UTF-8 en_AG en_AG.utf8 en_AU.utf8 en_BW.utf8 en_CA.utf8 en_DK.utf8 en_GB.utf8 en_HK.utf8 en_IE.utf8 en_IN en_IN.utf8 en_NG en_NG.utf8 en_NZ.utf8 en_PH.utf8 en_SG.utf8 en_US.utf8 en_ZA.utf8 en_ZM en_ZM.utf8 en_ZW.utf8 es_AR.utf8 es_BO.utf8 es_CL.utf8 es_CO.utf8 es_CR.utf8 es_DO.utf8 es_EC.utf8 es_ES.utf8… Read More »
This is a small script written in php that can fetch the whois information of an ip address from regional internet registries (RIR). Useful in finding information about ip address.
MAC Address The mac address (media access control address) or the hardware address or the ethernet address of an interface is a 48 bit number that looks like this : 00:1c:c0:f8:79:ee. Every machine connected to a network has a unique mac address that is used to deliver network packets to the correct machine. The mac… Read More »
On a Linux system, all network interfaces have a unique name that is shows up when you run the ifconfig command for example. The main network adapter often has the name eth0 or enp1s0 on linux systems. The ip address is configured using desktop gui tools, or through commands like ifconfig. If you are writing… Read More »