Priyanka Mittal

Slideshow 2! for php :)

Priyanka Mittal — Sat, 22 Aug 2009 16:13:49 +0000

Displaying the images

I was using slideshow 2! Script To display images in my project.

In my project the user was uploading the images using multiple upload function, then the user was allowed to see slide show of those images.

I was getting the list of images for a particular user from the database using SQL query. The problem that I was facing was that I was unable to make the slideshow function generic for N number of images.

Finally I was able to rectify this problem in code. I used the echo function to echo the file name in the script. Php is for the server side, so all the commands are processed by the server before opening the php file. All the statements given in the file are converted at time of execution; a simple html file is created.

Original code of slide show script

Slideshow 2! Is a java script code, which is used to display the images.

Link for Slideshow 2 :: http://www.dreamcss.com/2009/02/20-beautiful-javascript-and-ajax-photo.html

“http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd”>

Slideshow 2!

Using the slideshow script for the php , the proper solution which I used for generalizing the slideshow script for N no. of images :

// opening the database

$connection=mysql_connect(”localhost”,’root’,”)or die (”error occured”);

mysql_select_db(first_project)or die(”Could not open the datbase “);

$s=”select original,caption from images where user like ‘$user’ “;

$result=mysql_query($s) or die(”could not compile”);

// getting the name and caption of picture

$result=mysql_query($s) or die(“could not compile”);

if(mysql_num_rows($result) > 0)

{

$required1=array();

while($row = mysql_fetch_row($result))

{

array_push($required1,”‘”.$row[0].”‘:{ caption:’”.$row[1].”‘}”);

}

// making additions in array elements and creating a string from the array elements.

$a=implode(“,”,$required1);

mysql_free_result($result);

mysql_close($connection);

}

Images

This Slideshow script is really good, but it is most suited for images of same dimension. The script alters the images according to the dimensions mentioned in the function. When the script is used to display images of different dimension, it converts the images into the fixed dimension, thus the portion of images are removed. L

If we give large dimensions in the function, then there might not be problem in display images with large dimensions, but the images of small dimensions are stretched, thus the image quality is ruined. L

Some help required in 1st project

Priyanka Mittal — Sun, 28 Jun 2009 12:35:12 +0000

Finally the coding part of my first mini project is nearly complete . It seemed to be a very simple project at first for coding, but it wasn’t. It made me combine all the things together. I got to learn many interesting and useful things in this project. I have done the coding mainly in php.

The first project aims at building a small website using PHP and Mysql that shows a user registration page. Once user is logged in, the person can upload photos and can also view the photos the person uploaded earlier.

In the project I have created a homepage which offers signup option and signin option. When new person creates the account, the signup details are stored in the database.

Then a new page opens up which shows option of uploading picture and of viewing images. When the user chooses the upload option then a upload form is displayed. Then control is shifted back to previous page.

When the user chooses the display images option, then the images are displayed using Slideshow 2! .

Slideshow 2! Is a java script code, which is used to display the images.

Link for Slideshow 2 :: http://www.dreamcss.com/2009/02/20-beautiful-javascript-and-ajax-photo.html

But I am having problem in integrating php and java script.

The code of slideshow 2! Takes the name and caption of file as input, then with its help it displays the images. The javascript take data as object / array . I am having the problem in passing the image name and caption.

The original code of slideshow 2 ! is as under ::

“http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd”>

Slideshow 2!

I have tried to limit the number of pictures by 20 in the code but I need some help to get a proper solution.

// opening the database

$connection=mysql_connect(“localhost”,’root’,”)or die (“error occured”);

mysql_select_db(first_project)or die(“Could not open the datbase “);

$q=”insert into images(user,original,caption) VALUES (‘$user’,'$a’,'$caption’)”;

mysql_query($q)or die(“Could not compile the query”);

$connection=mysql_connect(“localhost”,’root’,”)or die (“error occured”);

mysql_select_db(first_project)or die(“Could not open the datbase “);

$s=”select original,caption from images where user like ‘$user’ “;

$result=mysql_query($s) or die(“could not compile”);

// getting the name and caption of picture

if(mysql_num_rows($result) > 0)

{

$required1=array();

$required2=array();

while($row = mysql_fetch_row($result))

{

array_push($required1,$row[0]);

array_push($required2,$row[1]);

}

Images

I was not able to pass the values in var data. I tried to push the values in the array but it didn’t work. Any suggestion are welcomed .

First Project

Priyanka Mittal — Tue, 16 Jun 2009 18:47:53 +0000

While implementing this problem, we will have four different pages that will be displayed to the user.

Home page or sign in page

Option available in it ::

User name and password
forgot password
sign up

Name
Desired Login Name: (check for uniqueness)
Choose a password:
Re-enter password:
email address
send confirmation.

Upload page:

For uploading new pictures in the account , options available :

Upload new pictures:
Display all pictures
Log out

Display pictures

display the pictures

Details related to coding the project:

The php script will contain the form for taking the username and password.

It will then call the checking function to check the correctness of username and password.

The function will first make a search in the database for the required username and then if the user exists. The user password will be checked.

If any of this condition is false, an error message will be displayed.

If we get a new user, the user will first signup, and then access the account. By clicking on the sign up option, a form will be displayed.

If user forgets the password then, a mail will be sent to the users email id, it will provide the password to the user.

Details of the sign up page/ form:

The fields in the form will be:

Name :
Desired Login Name: (check for uniqueness)
Choose a password:
Re-enter password:
email address
Send confirmation

When user fills the form and submits it, the details of the form will be submitted to the php script. The script will check for uniqueness of the username (we will use it as the primary key in our database), we will assign only one account for a email id so we will make the search again. If the two fields are unique then we will make the entry in the database.

Once the user has logged in, the user will be able to upload new files and see previous once.

Using html we make a form which takes a file as input, the form contain ENCTYPE argument in it. Once the file has been uploaded, we can use the global variable $_files to get the details of that file.

Details like:

Name
Size
Type

Once we get the details we can store them in database.

The details stored in database will be:

Username, file name, size and type of file.

If user tries to upload a file with same name as that of existing file , then it will show a error.

The user will be given option to delete the files.

When user uploads the file, we display all the pictures using slideshow.

The slideshow page will be a html page with java script embedded in it.

When user clicks on the sign out option, the temporary variable storing the username and password will be reset, thus user logouts.

1st tutorial :-)

Priyanka Mittal — Sat, 06 Jun 2009 13:43:16 +0000

Getting started with PHP language . J .It is similar to C language. So it is easy to learn for those who have knowledge of C or C++

Syntax of PHP Embedded in html:

. php code

.
?>

Commands ::

For Displaying Contents :

Commands used for displaying contents are echo and print.

Syntax for echo :

echo ‘contents to be displayed’;

example:

echo ‘HI THIS IS ECHO FUNCTION’;

Syntax for print:

print ”CONTENTS”;

example:

print ”THIS IS PRINT FUNCTION”;

NOTE : Every command in PHP terminates with semicolon ( ; ).

Adding Comments To PHP File:

PHP supports both single-line and multi-line comment blocks:

Single line comment:

Syntax :

// this is a single-line comment

Multi line comment:

Syntax :

/* and this is a
multi-line
comment */

Variables in PHP:

PHP supports a number of different variable types: integers, floating point numbers, strings and arrays.

In PHP, a variable name is preceded by a dollar ($) symbol and must begin with a letter or underscore, optionally followed by more letters, numbers and/or underscores.

For example

$variable, $sum and $PRODUCT are all valid PHP variable names, while $1NEW and $4@hi are invalid variable names.

Subject Details

// define variables
$duration = 6;
$name = ‘PHP’;
$credits = 4;

// print output
echo “Name of subject : $name
Duration of course : $duration
Credits allotted : $credits “;
?>

Data types used :

Boolean: The simplest variable type in PHP, a Boolean variable, simply specifies a true or false value.

$access = true;

Integer: An integer is used to store whole numbers like 75, -95, 2000 or 1.

$marks = 99;

Floating-point: A floating-point number is typically a fractional number such as 101.25 or 3.141592653589. Floating point numbers may be specified using either decimal or scientific notation.

$rate = 56.89;

String: A string is a sequence of characters, like “Delhi” or “cute_girl”. String values may be enclosed in either double quotes (“”) or single quotes(”).

Example:

$identity = ‘Sachin’;
$car = ‘BMW’;

// this would contain the string “Sachin owns a BMW”
$sentence = “$identity owns a $car”;
echo $sentence;

Operations on Variables :

Addition : adding two numbers

Example :

$a = 10;

$b = 14;

$sum=$a + $b;

$a = 5+ $a;

$a +=5;

Adding two strings: two strings are added with help of dot (.) symbol;

$a=’hello’;

$b=’world’;

$c=$a.” ” . $b;

// $c = ‘hello world’;

Multiplication of variables:

Example:

$a = 10;

$b = 14;

$multi=$a * $b;

$a = 5 * $a;

$a *=5;

Subtraction of variables :

$sub=$a – $b;

$a – = 5;

Division:

Example:

$div=$a / $b;

$a / =5;

Reference :

PHP 101: PHP For the Absolute Beginner :: http://devzone.zend.com/node/view/id/625

Starting with PHP

Priyanka Mittal — Fri, 05 Jun 2009 12:15:18 +0000

As a part of training I was asked to start studying PHP, I thought of exploring some things about it.

Its full form: In early versions, PHP used to stand for Personal Home Page. Later it was renamed to ‘PHP: Hypertext Preprocessor’.

Why we use PHP?

It is easy to use and learn.

Effective codes can be created using it. It has excellent performance even on high loads.

Syntax for PHP script::

php code

Environment:

For using PHP language, we need to embed the PHP script in html format of webpage, similar to JavaScript.

For running the webpage with PHP script , we need to host it on server. A good option is to down load software named :: XAMPP

from:: http://www.apachefriends.org/en/xampp-windows.html

It helps in creating a local host, thus we can run the required php file.

The XAMPP s/w is available for various Operating Systems, like Linux, windows, Solaris and for Mac OS X .

After downloading the s/w, I started the setup. It was very easy to install the s/w on system. XAMPP creates a control panel which is used to start and stop modules (apache, mysql, fizezilla, mercury). Then I tested the control panel by starting and stopping the modules.

To test the running of PHP on local host, v need to make a PHP file:

A Simple PHP file : saved it as message.php

This is HTML BODY

// print output
echo ‘
Now in PHP script ‘;
?>

For testing the file, I started the apache and mysql modules of XAMPP control panel. After that opened http://localhost in internet explorer.

It displays the welcome page, after that the address in address bar changes to

http://localhost/xampp/ .

I tried opening the file after saving it in directory (in XAMPP folder) where I had installed XAMPP. Address I mentioned was http://localhost/xampp/message.php , but it gave error. It said that file doesn’t exist.

Then i came to know that XAMPP runs those files which are stored in folder named ‘htdocs’. Folder ‘htdocs’ is present in the XAMPP folder which is created during installation of s/w.

I stored my file in ‘htdocs’ and tried using http://localhost/message.php in address bar . The file was then executed, and output was obtained.

If we create folders in ‘htdocs’ then we have to mention the folder name followed by the file name in the address bar.

Example : we have created a folder named ‘try’ in ‘htdocs’ and saved file ‘first.php’ in it . To exacute the file we have to mention :

http://localhost/try/first.php

Then our file will be executed.

PHP and ASP.NET

Priyanka Mittal — Thu, 04 Jun 2009 16:16:10 +0000

PHP and ASP.NET are two most widely used languages for development of web applications. After second year students are required to do training (learn some language or industrial training). The most popular pick in students is ASP.NET because of time constrain. They learn DOT NET in 1 month , it is easy to learn, as people say ,’it only requires drag and drop , and code is generated for it by the software ’. But I started with PHP in my training first and found that its easy to understand, ones we have the algorithm to implement a problem , it can be coded easily.

Now dealing with difference of PHP and ASP.NET

PHP

ASP.NET

PHP is a language. It consists of platform independent engine that computes PHP scripts.
It provides web application functionality such as database connectivity
It is not built on OOP paradigm; it supports partial encapsulation and partial polymorphism.
In PHP, the script is embedded in HTML.
When a page written in HTML and inline PHP script is requested, it is compiled to binary format called Zend Opcodes.
Once the page is compiled, the opcodes are run by Zed Engine and HTML is generated for the page which is sent to the client

It is not a language.
It is a technology and is small part of the .net framework.
It is built entirely on OOP paradigm.
The requested page written using ASP.NET is first converted into an intermediate language called MSIL (Microsoft Intermediate Language).
The CLR then converts this MSIL to machine code.
Conversion to machine code only takes place once for each page request (unless code has been modified).

All subsequent requests use the already generated machine code.

Open source software

Priyanka Mittal — Sun, 31 May 2009 19:35:35 +0000

Open source software ( OSS ) is a programming philosophy where by all aspects of a program are open for view , that is : program and certain other rights which are normally reserved for copyright holders are provided under a software license that meets the Open Source Definition or that is in the public domain.

The term (OSS) usually refers to a source code of the program , but can also refer to files created by program. The OSS allows the users to use, change, and improve the software, and to redistribute it in modified or unmodified form.

Open source software generally allows anyone to create modifications of the software, port it to new operating systems and processor architectures, share it with others or market it.

History related to OSS

In 1998, a group of individuals advocated that the term ‘Free Software’ should be replaced by open source software (OSS) which would be less ambiguous and more comfortable for the corporate world.

The Open Source Definition, presents an open source philosophy, and defines the terms of usage, modification and redistribution of open source software. Software licenses grant rights to users which would otherwise be reserved by copyright law to the copyright holder. The Open source distribution makes the source codes of a product publicly accessible; the open source licenses allow the authors to fine tune such access.

Philosophy

It is suggested that the model used for development OSS is the Bazaar model. Even though the roles are not clearly defined in this model, the software developed using the Bazaar model should exhibit the following patterns:

Users should be treated as co-developers

All the users are treated as co-developers, they should have access to the source code of the software. It permits the users to submit additions to the software, code fixes for the software, bug reports, documentation etc. The rate at which the software evolves is high. Each user’s machine provides an additional testing environment. This new testing environment offers that ability to find and fix a new bug.

Early releases

The first version of the software should be released as early as possible so as to increase one’s chances of finding co-developers early.

Frequent integration

New code should be integrated as often as possible so as to avoid the overhead of fixing a large number of bugs at the end of the project life cycle (example: iterative enhancement model).

Several versions

It suggests that there should at least be two versions of the software. There should be a buggier version with more features and a more stable version with fewer features. The buggier version (or the development version) has latest features, but has some bugs in it. It is for the users who are willing to accept the risk of using code that is not yet thoroughly tested.

High modularization

The general structure of the software should be modular allowing for parallel development. This increases the speed of development of s/w.

Dynamic decision making structure

There is a need for a decision making structure, whether formal or informal, that makes strategic decisions depending on changing user requirements and other factors.

Funding

It might appear that, as the program code is available to all users, how does an organization or company get funds for creating software?

It’s a fact that OSS is given away for free, but a number of alternate models for funding its development have emerged. In general the Independent developers and companies make benefit from consultancy fees or by charging for services related to the end use of the software, i.e. training. Several free OSS packages may have ‘professional’ versions which have enhanced capabilities and are sold commercially. Many commercial open source applications are developed and distributed by companies as a combination of both open and closed source components. In this case, the company benefits from the availability of OSS, and thus in turn may end up funding OSS maintenance and upgrades when it benefits their application as a whole.

Reference ::

Open source software :: http://en.wikipedia.org/wiki/Open_source_software

Alpha testing and Beta testing..

Priyanka Mittal — Sat, 30 May 2009 11:36:43 +0000

H mm.. after reading software engineering, i came to know about what is the beta version of the software ,with help of alpha and beta testing . Beta testing is done at users site , in real environment ..

where as alpha testing is done at developers site and is done in controlled environment…

In beta testing it is expected that if a failure occurs , or if there is some problem , the user will report it to the developer , and help in updating the s/w.

It is prefered by the developers as many potential customers may send there reviews. Best part is that the reputation of the company is not affected…

Example :: beta version of firefox

Getting started with Blog

Priyanka Mittal — Sat, 30 May 2009 10:41:22 +0000

Today is my third holiday… or u can say … my 1st day of training.

I started with getting details about : what is blog and its need .

so now i know that a Blog :: it is a website maintained by a single user with regular updates from the user. It helps in maintaining a online diary (which others can read and leave a comment). (there are many diff. type of blogs depending on content and data delivered )

It can be a text document or audio or video file.

I started with creating my account with www.wordpress.com , and than obtained a unique domain from there.

Than the first thing was to search examples and videos.

With help of videos available in help , i learned to make static pages , to make new categories , posts and about widgets.

Then i created 2-3 pages… but was not able to add a caterogy to them , on searching for solution , i came to know the diff. in posts and pages in wordpress.

Pages are not viewed according to the date of creation , where as posts are displayed according to date of creation.

so to categories my updates i had to see what posts are ! how to use…

Posts were easy to create .. add pre defined animation .. image or video…

After that i personalized my blog… it can be done by selecting appropriate theme ( according to your wish) and then added some widgets…

The tag cloud and category cloud were the coolest one’s …

After all the searching and experimenting , the final result is the post which you are reading.

Welcome

Priyanka Mittal — Sat, 30 May 2009 09:53:05 +0000

This is my first Blog .

It contains content related to things i have managed to do till day ….

Also contains the things which i opt doing … my choice.. my wish …