Everyone must have heard of Pi, the irrational number that never ends. It goes by this :

3.14159265...

I have been learning about Pi since I was in 8th grade. All the time in school, I was curious about to which Pi extends.

Now, I know the extend – Infinity :P. I dedicated my precious Christmas vacation for finding the useless value of Pi.

Why ? Curiosity. Simply, the curiosity made me want to do this. Besides, it’s always fun to do something interesting.

There are softwares already that helps to replace a string in a file. Suppose, if you’re making a program that requires saving some data in to a file. By “adding”, the program is actually replacing a word. Let’s see how it’s done in PHP & Python.

This is the file where we are going to replace the word :

thisWord
I got thisWord for making it thatWord
replace thisWord already my friend.

We replace the word “thisWord” to “thatWord” containing in this file.

A folder has files and sometimes sub directories. If we use the normal function for obtaining contents of a folder, we won’t get the details of the files in the sub directories. In this case, we have to look over into the sub folders and into other sub folders within this sub folder. This looking up of files deep down is called Recursive Folder Searching.

By doing this, we can search for a file or do various actions with each files thus recursed. An example case of this is the replacing softwares like regexxer. It uses recursion to replace a string to another in multiple files in the same directory even under any sub folders.

Palindromes are unique words that are read the same forward and backward. We can identify them using out eyes and brain. How about we identify using a simple program in PHP & Python ?

PHP

<?php
$word = strtolower("Malayalam");
$splitted = str_split($word);
$reversedWord = "";
$length = strlen($word);
for($i = 0; $i < $length; $i++)
	$reversedWord .= $splitted[$length - $i - 1];
echo $word == $reversedWord ? "It's a palindrome !n" : "It's not a palindromen";
?>

Instead of the loop to reverse the word, you can also use :

Python & PHP are great languages and there are many similarities between them. In this short post, you will learn how to execute terminal commands in PHP & Python.

PHP

As I said before many times in other posts, there areexec andsystem command to execute commands :

exec("firefox ‘http://subinsb.com’");

Or in the other way :

system("firefox ‘http://subinsb.com’");

Python

In Python, there is no exec or system function. But there is a system function in the os nodule. So, you have to include the os module first and then execute the command :

Infinite loops are loops that doesn’t have a defined ending. It will continue to run until the program it’s running in is terminated. Normally an infinite loop is created using while loop and is used for continuity of the same program.

In this short tutorial, you will learn how to make an infinite loop in both PHP & Python.

PHP

There is no need of defining any variables.

while(1){
  print "Hello"
}