IGNOU: November 2013

Monday, November 4, 2013

PHP - 5 : ODD EVEN Checking

Refer this introduction , before doing any PHP program.
PHP Introduction - And some useful points in Programming

Open Dreamweaver to write php code , with in the body tag .That is ,

<body>

.......................} php code

</body> .

and save it (as .php) under the www directory of wamp server.

Then click wamp-->localhost to view it in the browser.

=================================================================

A : Creatng the form :

B : Odd/Even checking code :

A & B : The total code is ;

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<head>

<title>Untitled Document</title>

</head>

<body>

<?php

if(isset($_GET["c"]))

{

$re=null;

$a=$_GET['name'];

if(isset($a) && is_numeric($a))

{

if ($a%2==0)

{

$re="Even number";

}else

{

$re="Odd number";

}

<form action="<?php echo $_SERVER['PHP_SELF'];?>" METHOD="get">

Enter a number <input type='text' name ='name' value="<?php if(isset($a)){ echo $a;} ?>"/>

<?php

if(isset($re))

{

echo $re;

}

?><br />

</form>

</body>

</html>

(Blue color is the first part (A) of the code , and brown color is the B part.

C : Result:

Back to HOME & PHP

Saturday, November 2, 2013

PHP-4 : Login form

Refer the below given sessions , before doing any PHP program.
PHP Introduction - And some useful points in Programming
PHP : WAMP Server

PHP-Database Connection

Open wamp-->phpMyAdmin to create database .
Open Dreamweaver to write php code , with in the body tag .That is ,

<body>

.......................} php code

</body> .

and save it (as .php) under the www directory of wamp server.
Then click wamp-->localhost to view it in the browser.

Back to HOME & PHP

========================================================================

The login form here given is the form only for saving the user name and password to the database.

Open wamp-->phpMyAdmin to create database (Refer PHP : WAMP Server to know in detail)

Refer How to create a Database in WAMP Server ??

In dreamweaver , we are writing the code as ;

A : Code for the form

B : Attaching code with the database..

Now we are creating the database connection through code.

Total code is A+B is ;

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>

<body>

<?php
if(isset($_POST["bt"]))
{
$connect=mysql_connect("localhost","root","")or
die("could not connect to the server");
mysql_select_db("student",$connect) or
die("could not connect to student database");
//php comment
$n=$_POST['name'];
$p=$_POST['pass'];

$q="insert into adddata values('$n','$p')";
$re=mysql_query($q,$connect);
if($re)
{
echo "Succesfully added a data";
}else
{
echo "Data could not be added";
}
die("<br><a href='home.php'>back to home</a>");
}
?>

<form action="<?php echo $_SERVER['PHP_SELF'];?>" METHOD="post">
<TABLE border=0>
<tr>
<td>Enter name</td>
<td><input type='text' name ='name'/></td>
</tr>
<tr>
<td>Password</td>
<td><input type='password' name ='pass'/></td>
</tr>
<tr>
<td colspan="2" align="center"> <input type="submit" value="Enter" name="bt"/></td>
</tr>
</TABLE>
</form>

</body>
</html>

(Codes in brown color is the second part(B) of the code and blue is that of A) .

Then , save it as .php

C : Output :

Save the file with the extension .php , and open if from WAMP SERVER ,

(click wamp-->localhost to view it in the browser.)

Again ,

To view the database , in which the values are stored, click WAMP-->phpMyAdmin,

Then , Select the database and table .

Note :

POST & GET are used to collect form-data.

Both GET and POST create an array , which holds key ( names of the form controls ) OR value pairs ( input data from the user) .

Information sent from a form with the GET method is visible to everyone , through URL.

So , GET should NEVER be used for sending passwords or other sensitive information!

Information sent from a form with the POST method is invisible to others , because the variables are not displayed in the URL, it is not possible to bookmark the page.

In the above code the following is the simple html code :

===========================

<!DOCTYPE HTML>
<html>
<body>

<form action="....." method="post">
Name: <input type="text" name="name"><br>
E-mail: <input type="text" name="email"><br>
<input type="submit">
</form>

</body>
</html>

===========================

This is the simple code, to create the form.
When the user fills out the form with username and password , and clicks the submit button, the form data is sent for processing to a PHP server.

PHP-Database connection

Read Introduction to DBMS / RDBMS before proceeding..

Refer PHP-WAMP Sever
Refer PHP - Introduction before reading this..
===============================================
1 : Writing PHP code

Check php-login form also.

We are writing PHP code in Dreamweaver.
To do so , open Dreamweaver.

Select PHP from the menu , and click CREATE.

Now we can see the code window as;

We are going to write the code with in the body tag That is , <body>..............</body> .

This is the first step in writing code

<Form action="<?php echo $_SERVER['PHP_SELF];?>" METHOD="post"> .

which implies that the action taken place when clicking the button ENTER .

SERVER['PHP_SELF] means after clicking the action taken place in the same pags itself(not redirecting into another page).
METHOD="post" ,which means the method used here is POST. There are two types of method we can use , POST and GET . In the example , if I enter Priyada as user name and click the button , then in the url of the page , we can see the entered name also if we choose the method GET . Otherwise not.
Input type = TEXT and PASSWORD , for both the user name and password field.
Other codes are HTML .We are using tr and td for table-row and table-column properties.

2 : How and where to save this file ?

Save this file with the extension .php (dot php) , save under the directory www , in which the WAMP server is located. It's better to create a folder (here , I created studyphp) under www , then save all the files under that .And the file name I gave is home.php .
You can select the www directory from the location in which the wamp server is located , or from the menu as given..

3 : How to view the output of the created code ??

Click the LOCALHOST from the above picture , and you can see all the folders under www directory , as ,

Open the folder we created under www directory.(here it is studyphp).

Then we can see all the files created with a heading Index of /Studyphp .

Click the saved file ( home.php is the name I used to save the code)

The output you can see then ,

4: Attaching code with the database..

Now we are creating the database connection through code.

Again , save the file , and open if from WAMP SERVER ,

In the code given above, note that;

The $ symbol is used to connect to the database. Also , for declaring a variable $ is uesd.
bt is the name of the button named ENTER .
This is the code used to connect to the database.

<body>
<?php
if(isset($_POST["bt"]))
{
$connect=mysql_connect("localhost","root","")or
die("could not connect to the server");
mysql_select_db("student",$connect) or
die("could not connect to student database");

Here, localhost is used to view result (instead if mysql is in any other computer , which is connected through network , instead of localhost , we have to give the name of that computer .

isset($_POST["bt"] will work , only if we click the button (ENTER)

If no connection is established , then the die statement will wrok.(If we dont give this statement , evenif the connection is not established , the page will remain as blank.).

We are declaring 3 variables as $n (for username) ,$p(fpr password) and $re(for result).

When we give $n=$_POST['name'] , the value in the textbox "name" will be transferred to the variable "n" . Note that "name" and "pass" are the names of the text field and password field we given.

href='home.php'>back to home

href is used to navingating to other area/page etc.

5 : Output :

Click WAMP-->Localhost

Enter user name and password (Follow the step 2 and 3 , to get the output screen again), then click ENTER . Then that value will be saved to the database.

While clicking ENTER , we can see .

To view the database , in which the values are stored, click WAMP-->phpMyAdmin,

Then , Select the database and table ,

Now we are going to do some database related programs..
Refer PHP-WAMP Sever before going through this section..
Refer PHP - Introduction before reading this..
============================ =========================================
Back to HOME & PHP

PHP : WAMP Server

Refer PHP - Introduction before reading this..
Click PHP-Database Connection .
====================================
If we type a web site address, the corresponding information is sent to us by some Servers.