The document discusses server-side API operations, focusing on the application program interface (API) as a set of tools for software development, and emphasizes JSON as a lightweight format for data interchange. It outlines functions for managing contact information, including adding, listing, editing, and deleting contacts, using a sample PHP function to retrieve contacts from a database. Additionally, it provides URLs for various operations related to contact data, along with example JSON responses for success and error scenarios.

1. Server side API
Hem Kr. Shrestha
Semicolon Developers Network Pvt. Ltd
Email: hereshem@gmail.com
Date: 5th Jan, 2013

2.  Server-side refers to operations that are
performed by the server in a client–server
relationship in computer networking..

3.  Application Program Interface
 An interface by software components to
communicate with each other
 A set of routines, protocols, and tools for
building software applications.
 A good API makes it easier to develop a
program by providing all the building blocks.

4.  JSON (JavaScript Object Notation) is a
lightweight text-based open standard
designed for human-readable data
interchange...
 Easy for machines to parse and generate
 Familiar to programmers of the C-family of
languages
 Collection of name/value pairs
 Alternative: XML

5. { <?xml version="1.0" encoding="UTF-8" ?
"res": "success", <res>success</res>
"data": { <data>
"id": "1", <id>1</id>
<username>hem</username>
"username": "hem",
<c_fname>Hem</c_fname>
"c_fname": "Hem", <c_lname>Shrestha</c_lname>
"c_lname": "Shrestha", <n_home>014488535</n_home>
"n_home": "014488535", <n_mobile>98443096958</n_mobile>
"n_mobile": "98443096958", <n_office>014782582</n_office>
"n_office": "014782582", <created>2012-12-21 05:52:03
"created": "2012-12-21 05:52:03 pm" pm</created>
</data>
}
}
More info about JSON data http://www.json.org

6. But before we start
Analyze your Requirements
Note down your outputs

7.  Add Contact
 List Contact
 Edit Contact
 Delete Contact

8. Server response
Success, error, page not found
Required data
Here we are using JSON data format for
contact information

9. Public function listContact () {
$sql = "SELECT * FROM `contacts` ";
$myquery = mysql_query($sql) ;
while($rows = mysql_fetch_array($myquery)){
$row_array['id'] = $rows['id'];
$row_array['name'] = $rows['name'];
$row_array['number'] = $rows['number'];
array_push($json_array,$row_array);
}
$json_result['res'] = 'success';
$json_result['data'] = $json_array;
echo json_encode($json_result);
}

10. To Add Contact
http://katibajyo.com/api/contacto.php?action=add&username=username
&c_fname=contact_firstname&c_lname=contact_lastname&n_mobile=m
obile_number&n_home=home_number&n_office=office_number
To list Contact http://katibajyo.com/api/contacto.php?action=list
To Edit Contact
http://katibajyo.com/api/contacto.php?action=edit&id=contact_id
To Delete contact
http://katibajyo.com/api/contacto.php?action=delete&id=contact_id
Visit http://katibajyo.com/api/contacto.php for all available operations.

11. JSON Object
{
"res": “error"
}
Or
{
"res": "success",
"data": {
"id": "1",
"username": "hem",
"c_fname": "Hem",
"c_lname": "Shrestha",
"n_home": "014488535",
"n_mobile": "98443096958",
"n_office": "014782582",
"created": "2012-12-21 05:52:03 pm"
}
}