Web Development

A get is a request that receives data from a web server by specifing parameters in the URL portion of the request

A post is used when you want to send data to a server

Get method adds data to the URL, therefore restricting the length (URL Max is 2048).

No restrictions.

Only ASCII characters allowed.

No restrictions. Binary data also allowed.

Get is less secure because data is being sent through the URL

POST is safer because the parameters are not stored in browser history and web server logs.

Receive client data

A party responsible for serving pages

A party the requests pages from the server. Then displays them to the user.

Example: Client is the web browser

The user uses Client in order to surf the web, fill in forms etc

PHP, Python, ASP.Net, Java etc.

JavaScript, HTML, CSS

Linux, Apache, MySQL, PHP

Start of a string

End of a string

A or b

Group selection

Match any character in the set

Not match in a set

Match in a range

Shortcut for [0-9]

Match space or tab

$arrayname = array("values","more values");

echo $arrayname[0];

OUTPUT: values

$arrayname = array(array("Volvo", 22, 19));

echo $arrayname[0][2];

OUTPUT: 19

$arrayname = array("value" => "35");

echo $arrayname["value"];

OUTPUT: 35

Superglobals are bulit-in variables that are always available in all scopes. (Associative arrays)

Example: $_GET, $_POST, $_SESSION, $_COOKIE

Cuts string and makes it into a array

print_r(explode ($string));

Converts array into a string

echo implode(" ", $array);

A cookie is a small file that the server embeds on the users computer

A session is used to store user data to be used across multiple pages. The variable passed will last until the page closes.

$con = @mysqli_connect("server","username","password","database");

Are functions used to terminate script execution

@mysqli_select_db($con, "database");

mysqli_close($con);

$queryResult = @mysqli_query($con, $queryString);

$row = mysqli_fetch_row($queryResult);

while ($row) {

echo $row[0];

}

var xhr = createRequest();

var place = document.getelementbyid("error");

xhr.open("GET", URL, true);

True = asynchronous

False = synchronous

xhr.open("POST", dataSource, true);

True = asynchronous

False = synchronous

if (window.XMLHttpRequest) {

xhrObj = new XMLHttpRequest();

}

if (window.ActiveXMLObject) {xhrObj = ActiveXObject("Microsoft.XMLHTTP);

String, Float, Boolean, Array, Object, NULL

Addition, Subtraction, Multiplication, Division, Modulus, Exponention

$x % $y

Gets the remainder of x divided by y

11

10

$x or $y

Returns true if either x or y is true but not both

Returns true if x and y have the same key value pair in the same order and of the same types

<h1 id="demo"> heading <h1>

document.getElementById("demo").innerHTML = "hello";

OUTPUT: hello

<h1> heading <\h1>

<h1> heading02 <\h1> document.getElementByTagName("h1")[0].innerHTML = "hello";

OUTPUT:

hello

heading02

When the data from the server gets called back to the client page

xhr.onreadystatechange = function()

var event = document.getElementById('p1');

event.addEventListener('click', function, true);

OR

event.AttachEvent('onclick', function);

}

mysqli_free_result($queryResult);

HttpRequest Object

responseText

domElementObj.innerHTML = xhr.responseText

xhr.open("GET", "dataSource.js?fname=Harry&lname=Smith" , true);

xhr.send();

xhr.open("POST", "dataSource.js" , true);

xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");

xhr.send("fname=Harry&lname=Smith");

Has data been loaded

Has the data transmission been completed without error

A string

a XML DOM object

1. JavaScript Call

2. AJAX Engine

3. Json/XML Data

<script type="text/javascript">

<script>

Unsent

Opened

Header_reciever

Loading

Done

count($arrayname);

Returns number of characters that two strings have in common

Returns the number of characters that two strings have in common

Returns the total number of characters in a string

Returns words in a string

returns the letter place in a string

ex. $string = adam;

OUTPUT: 1

Starts at a start of string

Starts at the end of a string

cuts string from specified point

OUTPUT: world

Replaces word in string

Separates string by token

Removes all tables from the database & deletes the database

Means to temporarily store information about a web server & it's web site visits

Before HTML tag

setCookie("cookiename","cookievalue", time() + (864300 * 30), "/");

$_COOKIE[$cookiename]

setCookie("cookiename", " ", time() - 3600);

session_start();

$_SESSION = array();

session_destroy();

Is the process of converting an object to a string

$checking = serialize($bankAccount);

Covert serialized data into a object

Removes the first element of an array from the beginning

Adds one or more elements to the beginning of an array

Function removes the last element from the end of an array

Adds one or more elements to the end of an array

Adds or removes array elements

sort() rsort()

ksort() krsort()

<button onclick="myFunction()">Click me</button>

Bubbling(false)

mysqli_connect_errno();

mysqli_connect_error()

mysqli_errno($conn);

mysql_error($conn);

mysqli_sqlstate($conn);