Finding the Nth Fibonacci number through input field PHP

Finding the Nth Fibonacci number through input field PHP

fibonacci series in php
number series in php

I'm having some issues getting the input code to work with the equation. I've been trying for a while (I'm new to coding) and searching, while not being able to make it work in any way. This is what I ended up with. Can anyone help me? Thanks in advance.

<!DOCTYPE HTML>
<html> 
<body>

<form action="" method="post">
<br />Choose a number to be the nth in the Fibonacci sequence: <input type="number" name="fibnum">
<input type="submit">
</form> <br /> <br />

<?php


if(isset($_POST['fibnum'])){


    $fibnum = $_POST['fibnum'];


    function fibRec($fibnum){

        if ($fibnum < 0){
        echo "There are no Fibonacci numbers of negative values.";
        }
            elseif ($fibnum == 0){

                echo "0";
            }

                elseif ($fibnum == 1){

                    echo "1";
                }

                    else {

                        $sum = fibRec($fibnum-1)+fibRec($fibnum-2); 
                        echo $sum;
                    }

    }
        $fib = fibRec($fibnum); 
        echo $fib;          

}           
?>    

</body>
</html>

to make it work all you need to do is change the echo's to returns like so:

<?php
$_POST['fibnum']=11;

if(isset($_POST['fibnum'])){


    $fibnum = $_POST['fibnum'];


    function fibRec($fibnum){

        if ($fibnum < 0){
        return ( "There are no Fibonacci numbers of negative values.");
        }
            elseif ($fibnum == 0){

                return ("0");
            }

                elseif ($fibnum == 1){

                    return ("1");
                }

                    else {

                        $sum = fibRec($fibnum-1)+fibRec($fibnum-2); 
                        return ($sum);
                    }

    }
        $fib = fibRec($fibnum); 
        echo $fib;          

}           
?>  

working demo: http://ideone.com/e0xeY7

Finding the Nth Fibonacci number through input field PHP , Finding the Nth Fibonacci number through input field PHP. I'm having some issues getting the input code to work with the equation. I've been trying for a while​  The Fibonacci series is a series of elements where, the previous two elements are added to get the next element, starting with 0 and 1. In this article, we will learn about how to generate a Fibonacci series in PHP using iterative and recursive way. Given a number n, we need to find the Fibonacci series up to the nth term. Examples:


you were pushing integers into echo. in a recursive formula, returning the value goes back to the calling entity, not automatically outside the function.

Take a look at this:

<!DOCTYPE HTML>
<html> 
<body>

<form action="" method="post">
<br />Choose a number to be the nth in the Fibonacci sequence: <input type="number" name="fibnum">
<input type="submit">
</form> <br /> <br />

<?php


if(isset($_POST['fibnum'])){


    $fibnum = $_POST['fibnum'];


    function fibRec($fibnum){

        if ($fibnum < 0){
        echo "There are no Fibonacci numbers of negative values.";
        }
            elseif ($fibnum == 0){

                return 0;
            }

                elseif ($fibnum == 1){

                    return 1;
                }

                    else {

                        $sum = fibRec($fibnum-1)+fibRec($fibnum-2); 
                        return $sum;
                    }

    }
        $fib = fibRec($fibnum); 
        echo $fib;          

}           
?>    

</body>
</html>

PHP, series in PHP using iterative and recursive way. Given a number n, we need to find the Fibonacci series up to the nth term. Examples: Input : 10 Output : 0 1 1  Initializing first and second number as 0 and 1. Print first and second number. From next number, start your loop. So third number will be the sum of the first two numbers. Example: We'll show an example to print the first 12 numbers of a Fibonacci series.


You can also use PHI constant associated with golden ratio to calculate nth fibonacci number. it is considered that fibonnaci number until 5th iteration are not as per golden ratio so you can have it like below :

<?php 

$fibnum = intval($_POST['fibnum']);

const PHI = 1.6180339887;
$f = [0, 1, 1, 2, 3];

echo getNthFibo($fibnum);

function getNthFibo($i)
{
    if($i < 5){
        return $f[$i];
    }

    // Starting from 5th iteration of fibo function
    $n = 5;
    $fn = 3;

    while ($n < $i) { 
        $fn = round($fn * PHI); 
        $n++; 
    }

    return $fn; 
}

Find nth Fibonacci number, HTML5 Interview Questions and Answers · What is a CSS Box Model? It should be very clear that if the input to our method is a 0, then we will return a 0 because Find nth Fibonacci number without using recursion – only iteration Here is what the iterative solution to finding the nth Fibonacci number looks like in PHP:  Find nth Fibonacci number using recursion It looks like this problem can be solved recursively because of the fact that there will obviously need to be a lot of “sub-tasks” in the form of adding up the previous two numbers in the sequence to get the next number in the sequence.


Write An Assembly Language Program What Will Calculate The Nth , You can compute the Nth Fibonacci number by using the following matrix If the input number is not within this range the program must ask the user. Here is what the iterative solution to finding the nth Fibonacci number looks like in PHP: Find XP CMD and in Windows 8 using DOS Box - kingspp/8086-​MicroProcessor. The even number Fibonacci sequence is, 0, 2, 8, 34, 144, 610, 2584…. We need to find n’th number in this sequence. If we take a closer look at Fibonacci sequence, we can notice that every third number in sequence is even and the sequence of even numbers follow following recursive formula.


A Flowchart to the First N Fibonacci Numbers, If N is 20, then you get Fibonacci numbers 0 through 19. The Fibonacci You could use it to find an arbitrary number. Given the input number i, draw a flowchart that quickly finds the output Fibonacci(i). Drawing PO Box 1244 a gray dot  Get the nth number in Fibonacci series in python. This article covered how to create a Fibonacci series in python. This python program is very easy to understand how to create a Fibonacci series. After the creation of a Fibonacci series, we can find the nth Fibonacci number in the series. Code:


PHP Fibonacci Series Program, PHP Fibonacci Series for beginners and professionals with examples, php file, php session, php date, php array, php form, functions, time, xml, ajax, php mysql, regex, string, oop. From next number, start your loop. So third number will be  nth fibonacci number = round (n-1th Fibonacci number X golden ratio) f n = round (f n-1 * ) Till 4th term, the ratio is not much close to golden ratio (as 3/2 = 1.5, 2/1 = 2, …). So, we will consider from 5th term to get next fibonacci number. To find out the 9th fibonacci number f9 (n = 9) :