Web tech basis

WebTechnologies And Basic Components
------------------------------------
1. Domain Name
2. Hosting
3. Server
4. Database
5. Technologies ----> HTML, PHP, JAVASCRIPT

--->Domin Name----> It is the name of the website that we purchase from domin name provider ----> godaddy.com, wix, 000webhost

--->Hosting -----> Place where i keep the content of my website

--->Servers ----> They help in processing the request and give me response

--->Database ----> are the backbone of the web technologies.... these are used to store data in the form of tables anb columns

Technologies
------------
programming and other tools which are used for building my web site
php, HTML, Javascript, css, angularJS, asp .net


webpage ---> collection of hyperlinks and hypertext
website ---> collection of different web pages


Security
--------
1. ssl sertificate ---> HTTPS ---> Secure Socket Layer
2. Firewall ----> filter---> malicious data
3. IPS and IDS ----> attacker se bachati hai
IPS = Intrusion Prevention Service
IDS = Intrusion Detection Service

hello---> plain text
algo ---> encrypt ---> secret language
kijui----> cipher text ----> secret text
algo ----> decryption ---> secret text ko plain text
hello-----> plain text

Misconception
-------------
1. HTTPS will not save you
2. Firewall can be easily bypass
3. All anti-malware can be evaded

Servers
-------
1. Microsoft servers ----> IIS + Apache + MSSQL ---> Paid
2. Linux Server ---> Apache + Tomcat + MySQL,SQL ---> Both, paid and open source as well


Windows based server ----> WAMPP
W ---> Windows
A ---> Apache
M ---> MySQL
P ---> Perl
P ---> php

Linux Based server ---> LAMPP
L ---> Linux
A ---> Apache
M ---> MySQL
P ---> perl
P ---> PHP

Mughe nahi pta k konsa OS h ---> XAMPP
X ---> Cross Platform ---> portable software server
A ---> Apache
M ---> MySQL
P ---> perl
P ---> PHP

HTML
----
HyperText Markup Language
<>--->tags ----> markup


1. <html>****</html> ----> it defines that my whole syntax is of HTML ---> each and every content of the webpage is written between this tag

2. <head>****</head> ----> it defines the header of the webpage

3. <title>***</title> ---> it gives the name in the tab --> always under head tag

4. <body>***</body>---> it define the whole content of the body---> ye head tag se bahar chalta h

5. <p>paragraph</p> ----> it defines a paragraph in the web page

6. <br> ---> it gives a new line to my web page.

7. <h>****</h> ----> It is used for providing a heading to my webpage content

8. <img src=""> ---> to insert an image into a web page

9. <a href=""> ----> me apne data ko link provide kr rha hu

10. <form>*****</form> ---> it will create a login type form
<input> ---> different elements


first.html
<html>
<head>
<title>First Page</title>
</head>
<body>
<a href="https://www.google.com/search?q=dragon+ball+z&client=ubuntu&channel=fs&tbm=isch&source=lnms&sa=X&ved=0ahUKEwjB-IXQ-vvVAhVLIlAKHXznCnYQ_AUICygC&biw=1309&bih=671&dpr=1">
<h1>Dragon Ball Z</h1>
</a>
<a href="https://www.google.com/search?client=ubuntu&channel=fs&biw=1309&bih=671&tbm=isch&sa=1&q=lucifer+&oq=lucifer+&gs_l=psy-ab.3..0i67k1j0l2j0i67k1.31225.32550.0.33264.8.8.0.0.0.0.518.1123.2-1j1j0j1.3.0....0...1.1.64.psy-ab..5.3.1120.9VRWyWn6WqQ">
<p>Hello, everyone.<br> This is my first web page.<br> My name is Lucifer Morning Star.</p>
</a>
<a href="https://www.google.com/search?q=goku&client=ubuntu&channel=fs&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjUxf3B-fvVAhUPU1AKHeNSD0YQ_AUICigB&biw=1309&bih=671"><img src="/home/avi_lucifer/Desktop/goku_by_bpsola-d6j32pk.jpg">
</a>
<p>Login Via Facebook Account</p>
<form action="second.html" method="get">
username : <input type="text"><br> <br>
password : <input type="password"><br> <br>
<input type="submit" onClick="second.html">
</form>
</body>
</html>


second.html
<html>
<head>
<title>Second Page</title>
</head>
<body>
<p> Welcome to the fake facebook</p>
</body>
</html>


php----> Hypertext preprocessor
-------------------------------
Basics of PHP
------------------
PHP is a server side language, which is used to create dynamic website.
PHP variables → they are temporary memory location which holds input data.
Variable name should start with $ sign.
    After $ sign, there is a alphabet [a-z][A-Z] or underscore(_)
    After that there will be a combination of alphanumeric character and underscore.
    Eg. $uname = “Abhijeet”
           $s_salary = 30000

PHP operators → they are use to manipulate data and variables.
Arithmatic operator
+ → addition → $a +  $b
- → subtraction → $a - $b
/ → division → $a / $b → quotent
* → multiplication → $a * $b
% → modulus → $a % $b → remainder
 Assignment Operator
= → asign the value → $a = 10
+= → $a += $b → $a = $a + $b
-= → $a -= $b → $a = $a - $b
*= → $a *= $b → $a = $a * $b
/= → $a /= $b → $a = $a / $b
%= → $a %= $b → $a = $a % $b
 Relational & Comparision Operator
> → $a > $b
< → $a < $b
>= → $a >= $b
<= → $a <= $b
== → $a == $b
!= → $a != $b
Logical Operator
AND (&&) → when all the conditions are true, then the answer will be true.
OR (||) →when any one of the condition is true then the answer is true.
NOT (!) → It will reverse the value… true to false and false to true.
    PROGRAM
----------------
    <?php
    $a = 10;
    $b = 20;
    $sum = $a + $b;
    echo “The sum is ”.$sum;
    ?>
 PHP Conditional Statement → they always return some boolean value… either true or false.
If | Else
if($a > $b)
{
echo “A ig greater”;
}
else
{
echo “B is greater”;
}
If else if else
if($a>$b && $a>$c)
{
echo “A ig greater”;
}
else if ($b>$a && $b>$c)
{
echo “B is greater”;
}
else
{
echo “C is greater”;
}
Nested If Else
<?php
$age = 27;
$gend = “Male”;
if ($age > 25)
{
    if($gend == “Male”)
    {
        echo “Eligible”;
    }
    else
    {
        echo “Not eligible”;
    }
}
else
{
    echo “Age is not 25 yet”;
}
?>
 PHP Loops → Looping is a process for executing multiple statements at a single line or repetition of statement.
For Loop → in this loop first condition is check and then executed. It needs three things for starting this loop → initialization, condition, iteration.
    for(initialization; condition; iteration)
    {
        Statements;
    }


for($i = 1; $i < 10; $i++)
{
    echo “likho <br>”;
}
While Loop → condition is check in the start. Return boolean value.
    while(condition)
    {
        Statements;
        Iteration;
    }

    while($num < 5)
    {
        echo num;
    }
PHP Form → it is something like having textbox, labels, radio buttons, check buttons, submit buttons. Wherever you can see any query form, login form, feedback form, they all use PHP form
Textbox
Password
Radiobutton
Checkbox
List|Menu
Textarea
Filefield
Submit button
Reset
Normal Button
 PHP GET|POST→
GET → unsecure method, because it display the form field values in the url. Uses upto 1mb. Fast process.
POST → It is secure method. Large amount of data can be send. It is a slow process.