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1. Creating the Index Page

We will start by creating a file called 'index.php', which will store the template of the chat application as well as the functionality of the application. In this section, we will only deal with the application template, functionality will be discussed in the later section. So let’s create the file and write the following code in it.

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Listing 1. Creating the index page

To develop other kinds of chats in such other programming languages or platforms, please refer some of our articles:

This is just a simple HTML inside a PHP file with the title 'My Chat App'. Then we have linked a CSS file which we will create when styling our chat application.

Now, the main template is our chat application. We have created a div called 'container', which will contain the whole chat application inside it. We then have another division with the id 'chat_box', which will contain only the different chat messages that are being sent and received in real time. We will get the chat data through our database later in this article, but for now we will just enter some dummy data so that our chat application will look good.

We have created three different span tags for displaying the name of sender/receiver, the message and the time when the message was sent or receiver. We have used different styles which are basically different colors for displaying name, message and the time. This is just to make our application look beautiful. This was all about the content that we want inside the division with the id 'chat_box'. Now we will create a form which will be used by the user to enter his/her name and message and also it will have a button to send the message.

We have created a form which contains three different fields: name of the sender/receiver, message and the send button. We have used an input tag for storing the name because name does not exceed a single line. Then we have a textarea for the message and we have again used an input tag to display the button to send the message to the chat application.

So now it’s time to add some styles to our application to make it more awesome!

Create a file called 'style.css' and write the following code inside this file.

Listing 2. Creating the stylesheet for the chat application

This is the code for the CSS for our project. We have used zero padding, margin and border for the whole web page. We have used the background for the body to be silver, which means that our web page will be silver and the chat application background will be white.

After this, we have used custom width and height for the chat application. /tony-hawk-pro-skater-4-serial-key.html. We have used width in percentages so that our chat application will be responsive. Responsive application means that it will perfectly fit on all types of devices, whether you open it in a mobile browser or in a desktop.

For the form styling we have used the height to be 40 pixels and the width to be 100%. We have used the solid border of color grey and the border radius is 5 pixels. So this was all about styling our chat application. Here is a snapshot of our chat application with a dummy data.

Figure 1. Having a look the chat application.

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2. Creating the Database and Table

We will create a database called 'chat' and inside this database we will create a table called 'chat' and it will have four different columns: ID, Name, Message and Date.

Here is the screenshot of the table that we have to create.

Figure 2. Our Database Table

Now we will insert some dummy data inside this table. Let’s create two new rows inside the table. Here is the snapshot of the data that you have to insert in the chat table.

Figure 3. Filling Dummy Data

Download minilyrics full for mac. Now after saving these two rows in the database, if we browse the table, then we will see that there are two rows present inside the table 'chat' which will act as dummy data for us.

Figure 4. Dummy Data inside Database

Now we will create a new file called 'db.php' to create a database connection which will make a connection between the database and the PHP file.

Create a file called 'db.php' and add the following code to it.

Listing 3. Creating the database

This is a simple PHP database connection file in which we have created four different variables: host, user, pass and db_name. host will store the value 'localhost' as we are not deploying the chat application on the real servers. user and pass will store the username and password for the phpmyadmin. By default, the password is null so we are keeping it blank.

Then we are storing the name of the database 'chat' in the variable 'db_name'.

We are now creating a variable called 'con' which will establish a connection between the database and the PHP file. It is a PDO method to establish a database connection. It will take four different arguments, which we have already created earlier in this file.

This is all we have to do in the 'db.php' file.

Now we will have to edit the 'index.php' file and add some lines of code to it.

Listing 4. Editing the index file

So now our database connection has been established. To check this, we can refresh the chat application and see whether any error has occurred. If there is no error, it means that our connection has been established.

3. Displaying the Chat data on the page

In this section, we will see how we can display the chat data on the chat application from the database table using query in PHP. Recall that we have earlier created a table for the chat application and we inserted some dummy data inside the table. Now, we will display the same data inside the chat box using queries.

Inside the 'index.php' file, recall that we have created a div with the id 'chat_box'. So inside this div we will add some PHP commands.

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Listing 5. Displaying the data

<?php …. ?> is just a simple opening and closing PHP tags. We have created a variable called 'query' which will store the MySQL query that we want to run. The query which we have used here means that we will grab all the data from the chat database table and arrange it in ascending order of time which basically means that the recent messages will be displayed at the bottom similar to any chat application that you might have used. We can also arrange the messages in descending order if we want just by adding 'DESC' at the end of the query. In that case, our query will end like this 'ORDER BY id DESC'.

After this we have created a variable 'run' which will link the query to the database connection that we created in the 'db.php' file in the above section. We have used a while loop in which the condition to stop is whenever the table will be fully traversed. 'fetch_array()' means that we are converting the database table row into an array so that we can easily use that in PHP.

Now inside the division with id 'chat_data' we will add some more PHP code.

Listing 6. Displaying the data dynamically

Remember that inside the span tags we had some chat data which we have written. So now we have removed that data and we have inserted some PHP command which will fetch data from the database table of the chat application. Remember that inside the while loop condition we have created an array from the row of the table and now we are using that array to echo name, message and date inside the chat application. This is simply done by the echo statement in PHP. After the end of this div we have created another PHP tag which simply says to end the while loop that we have created above.

So now our chat data is fetched from the database table of the application. Here is a screenshot of the same.

Figure 5. First Look at the application

4. Inserting Chat data into Table

In this section, we will see how we can send the message from the form that we have created into the database table and in return it will be displayed inside the chat application from the table. So inside the 'index.php' file after the form tag we will write some PHP code.

Listing 7. Inserting data into database

We have created an if statement which checks whether the submit button is pressed on the application. This is done with the help of a function called 'isset' in PHP. We are checking whether the 'submit' is pressed or not by accessing it from the PHP Super Global which is '$_POST' because the form method is post.

After that we have created two variables for storing the name and message from the form so that we can use a query to store the data in the database table. These values are stored from an array which is a $_POST array in PHP. Now we have created a variable 'query' to store the name and message in the table and then we are connecting it with the database using a connection that we have created in the 'db.php' file.

So now our chat data can be stored from the form in the database table and we can view it by refreshing the chat application page. Here is a screenshot of the same.

Figure 6. Chat Application working with the form

5. Using AJAX to make it Real Time

In this section, we will see how to use AJAX to make our chat real time, which means that we will not have to refresh the page. Inside the 'index.php' file we will add some code in the head tag.

Listing 8. Making an AJAX Request

Now we will create a new file called 'chat.php' and remove some code from 'index.php' and move it into 'chat.php'.

Listing 9. Some code conversion

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So we are using a script tag inside the head tag so that we can make use of AJAX using JavaScript inside the PHP file. We have created a function called 'chat_ajax' which will be automatically called whenever our chat application is loaded and it will automatically refresh the page so our chat will become real time.

We have created an HTTP Request object using AJAX. After this we are using an if condition to check whether the page has been successfully loaded. Suppose the page has been loaded and the Request is granted then we will use a JavaScript function 'document.getElementById' to get any element by ID on the page and to change its HTML. So then we are changing it to display with the chat data from the database which is written in the 'chat.php' file. Remember that chat.php file has the code which was inside the index.php file. We have separated the code so that we can easily understand the AJAX Request.

Wpa2 psk password cracker. So now our chat application is complete.

Figure 7. Real Time Chat Application

Conclusion

In this article, we have seen how we can use HTML inside a PHP file and then create a chat application which is capable of real time chatting. We have used a real database to store our chat data and retrieve it inside the chat application. Feel free to start the discussion if you are facing any problem.

Chatting is one of the most implemented feature on websites. Group chat makes users to share their feelings and other news easily to their friends easily. AJAX makes this chatting more beautiful, elegant, simple and comfortable. Group chats may be vulnerable to SQL injections and XSS attacks. But in this post where we’re going to make a group chat that doesn’t have these vulnerabilities which makes it more awesome. You can see a demo, or you can download the files directly.

Things To Note

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Make sure the Time Zone on MySQL server is the same as on PHP server. If the time zone is different, the user’s online presence can’t be understood.

We limit the name of the user to 20 characters, because we don’t want a long name that overflows the 'online users' display element. There is no error message displayed when a user submits a name of more than 20 chars. If the user submits the name of 20 chars, the first 20 chars will only be inserted in to the table. Other chars after 20 chars will be removed by MySQL.

If you need Users’ Typing Status display with the chat, see this tutorial after completing this tutorial.

tables.sql

The SQL code that creates the two tables needed for the group chat is contained in the tables.sql file :

When you execute the above SQL code, you will have two tables, one chatters and the other messages. In chatters table, we add the logged in users’ details where as the other one, we will add the messages sent by the users.

config.php

The database configuration is stored in this file. You should change the credentials according to your database :

The session is started when this file loads. There is a file named user_online.php included in the file. This file deletes the offline users and updates the time stamp of the currently logged in user. This time stamp determines the online, offline status. I explained more about it in the user_online.php heading in this post.

index.php

The main character of our chat is this file. index.php joins everything together.

When a user is not logged in, this file will load the login.php file which have the login box and others. If the user is logged in, then it will directly display the chatbox.php which contains the chatbox. Users who are currently online are shown using users.php file.

login.php

The login box and the login authentication, filtering, checking are added in this file. This file is included twice in the index.php file, one for checking and other for displaying login box.

If the user has submitted the login form, then this file will do the following :

• Filter Name (Remove HTML entities)
• Check If there is another user with the name

If everything is OK, then the file changes the user value of session to the name submitted. index.php and chatbox.php takes care of the rest.

chatbox.php

This file don’t have that much content. This file contains the log out link, chat messages container and chat form :

The messages are displayed from msgs.php and the form is also displayed.

msgs.php

Displays the messages sent by the other users and himself/herself. A request is made to this file every 5 seconds to check new messages. When the user logs out from another page of the browser window, msgs.php will make the current page reload to make sure everything is alright.

send.php

When the user submits a message, the message is sent to send.php. This file handles the message, filters it and insert into database.

users.php

Currently online users are displayed using this file. This file is also requested in every 5 seconds by jQuery.

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user_online.php

Whenever the config.php file is called, this file is also called. This file loops through the online users on table chatters and check if their time stamp is lesser that 25 seconds the current time. If it is lesser, then that user is dropped (deleted) from the table. It also updates the time stamp of the currently logged in user if there is one making it impossible for the other script to delete the current user. It is necessary to have the same time zone on MySQL server and the PHP server. If the currently logged in user is accidentally deleted in case of misunderstanding, the script will automatically add the user to the table chatters. What an important file !

logout.php

If the user can log in,.there should be a log out option. Here is the file that will destroy the session and redirects to the main page or as you call it 'logout' :

It’s time to move to the client side, where we will design our chatbox with CSS and add the jQuery code to make it easy.

chat.css

The chatbox, online users and other styling is in here :

The elements we added are all wrapped in the .chat container, so the chat.css won’t mess up any other styles of your site.

chat.js

The jQuery code is the content of this file. Note that you should add a script[src] that links to the jQuery library source.

I think that’s all the files. I made it to these much files to make the tutorial easy. Hope you like it. Be open source, share this with your developer friends. I’m sure they would love to see this. If you have any problems / suggestions, please say it out in the comments, I would love to hear it from you and I will reply if there isn’t any stupid school projects.