Web Technology Experts Notes

SDLC stands for Software Development Life Cycle.

It is series of process that followed to be make a software successful. In software development, if you follow the process of SDLC, the chance of success of project increase.

Today In IT Industries most of the companies including MNC follow this process. It help to complete the project on timely and with higher success rate.

Benefits of the SDLC Process

The intent of a SDLC process it to help produce a product that is cost-efficient, effective and of high quality. Once an application is created, the SDLC maps the proper deployment and decommissioning of the software once it becomes a legacy. The SDLC methodology usually contains the following stages: Analysis (requirements and design), construction, testing, release, and maintenance (response).

Following are the main steps of SDLC

1. Preliminary Analysis: The objective of phase 1 is to conduct a preliminary analysis, propose alternative solutions, describe costs and benefits and submit a preliminary plan with recommendations.Conduct the preliminary analysis: in this step, you need to find out the organization's objectives and the nature and scope of the problem under study. Even if a problem refers only to a small segment of the organization itself then you need to find out what the objectives of the organization itself are. Then you need to see how the problem being studied fits in with them.Propose alternative solutions: In digging into the organization's objectives and specific problems, you may have already covered some solutions. Alternate proposals may come from interviewing employees, clients , suppliers, and/or consultants. You can also study what competitors are doing. With this data, you will have three choices: leave the system as is, improve it, or develop a new system.Describe the costs and benefits.

2. Systems analysis, requirements definition: Defines project goals into defined functions and operation of the intended application. Analyzes end-user information needs.

3. Systems design: Describes desired features and operations in detail, including screen layouts, business rules, process diagrams, pseudocode and other documentation.

4. Development: The real code is written here.
Integration and testing: Brings all the pieces together into a special testing environment, then checks for errors, bugs and interoperability.

5. Acceptance, installation, deployment: The final stage of initial development, where the software is put into production and runs actual business.

6. Maintenance: What happens during the rest of the software's life: changes, correction, additions, moves to a different computing platform and more. This is often the longest of the stages.

Follow the following steps to implement caching in Core PHP?

Create a folder with write permission where you store the output of page
At the start of file, check whether you have already stored the output of file or not
If you have already stored the output in cache, then get the contents from cache instead of executing the code
If Not, first prevent the php to send the output to the browser (ob_start php) and store the output in cache folder
Create the page in your application from where you can delete all the files, stored in cache folder (when website updates)

See Example

$fileName="xxxx.html";
$cacheFolder="/cache/";//must be writeable 

//check if file in cache
if(file_exists($cacheFolder.$fileName,'r'){
$output = file_get_contents($cacheFolder.$fileName);
}else{
ob_start(); //stop sending output to the browser
//do work
//do work
//do work
$output = ob_get_contents();
ob_end_flush();
$fp=fopen($cacheFolder.$fileName,'w');
fwrite($fp, $output);
fclose($fp);
}
echo $output;