Skip to main content

Interview question #1

Since I have been asked to interview experienced PHP programmers, I was preparing few interview questions. I came to know, most of the people ask questions found in the Internet; most of them are like "What is the function used to connect MySQL DB in PHP". Personally, I don't like these types of questions; I'd thought the person must apply ideas what he was taught in colleges--finally I came out with one question:

A product vendor has Quantity Vs. Price data like
1 -> Rs. 50
2 -> Rs. 95
3 -> Rs. 140
.... like upto 1 million data. He wants a system, which gives the price when the quantity is provided. For example, if you provide the quantity value as 2, then it should provide Rs. 95. How this system can be designed?

As expected, all the people said about using database tables and quering on quantity. I have asked them to find out a system which doesn't use databases--provided the accuracy of the system may not be 100%--it may give at least 90% accuracy. To my surprise, none of the people I have interviewed yet didn't provide any solutions.

I must find out few other questions especially for a post of "Web Application Developer".

Comments

Anonymous said…
amount = (45 * quantity ) + 5
For comment#1:Good, if the data are just 3. What if you have about 1 million data? What is the procedure?
Anonymous said…
use Chi Square
For comment#3:You've exceeded my expectation:-) I'd rather expect even a simple keyword. May I know your name?
Anonymous said…
Is it possible to use an associative array(performance?)? - like

$product[$price] = $quantity;
Online Pharmacy said…
This comment has been removed by a blog administrator.
Sindhuja said…
$amount = (45 * ($quantity -1)) + 50

Popular posts from this blog

Converting PSD with PHP/ImageMagick

After seeing feature rich options in Imagick PECL extension at Mikko Koppanen 's (the author) website and also impressed with ImageMagick 's features, I have decided to use it for the PSD to XHTML conversion website that I'm architecting and managing. Since, the team wants programming help for converting PSD images, I have tried it (documentation is sparse on PSD handling) Converting PSD to PNG/JPEG/etc Note that, flattenImages() is needed for layered/multi-page PSD file. <?php $im = new Imagick('test.psd'); $im->flattenImages(); $im->setImageFormat('png'); $im->writeImage('test.png'); ?> Extracting PSD layers One by one <?php $im = new Imagick('test.psd'); $im->setImageFormat('png'); for ($i = 0, $num_layers = $im->getNumberImages(); $i $im->setImageIndex($i); $im->writeImage('layer' . $i . '.png'); } ?> Note that, there is a better version below In a single call with writeIm...

Google used PHP?

I wanted to know what are the pages in Google are powered by PHP . I have tried various keywords including "inurl"--but it produced huge list. So I tried "filetype:php" and it worked very nice. The real keywords are php filetype:php site:google.com Google used PHP?

Solved: "Ports" Tab Not Visible in VS Code (WSL2)

None of the solutions I found on Reddit or GitHub worked, and most of the related GitHub issues were locked. So I'm documenting this here for future reference. Problem When using WSL2 in Visual Studio Code, the Ports tab—needed to access your application in Windows browsers like Chrome or Edge—doesn't appear. Even the Ports-related options are missing from the Command Palette. Solution After a lot of trial and error, here's what worked: Run npx serve in the VS Code terminal. It will output a URL such as http://localhost:3000/ . Click the link (or use the Follow Link option). This will open the app in your default browser. You may notice that it opens on a different port (for example, http://localhost:64198 ). At this point, the Ports tab becomes available in VS Code. After this initial trigger, the Ports tab seems to remain available in future VS Code...