# PHP Fibonacci Series printing

A Fibonacci Series of numbers will look like
0 , 1 , 1 , 2 , 3 , 5 , 8 , 13 , 21 , 34 , 55

First two Fibonacci numbers are 0 and 1 . After that each number will be the sum of previous two numbers . Here we can see that third Fibonacci number is 1 ( sum of first two numbers 0 + 1 ) , and fourth Fibonacci number will be the sum of third and second number ( 1 + 1 = 2 ) , and fifth Fibonacci number will be the sum of fourth and third number ( 2 + 1 = 3 ). The series will go like that infinity .

Now we can learn how to make a Fibonacci series using PHP .
Here is the PHP script for printing first 20 Fibonacci numbers .

<?php
\$count = 0 ;
\$f1 = 0;
\$f2 = 1;
echo \$f1." , ";
echo \$f2." , ";
while (\$count < 20 )
{
\$f3 = \$f2 + \$f1 ;
echo \$f3." , ";
\$f1 = \$f2 ;
\$f2 = \$f3 ;
\$count = \$count + 1;
}
?>

Its output will be :

0 , 1 , 1 , 2 , 3 , 5 , 8 , 13 , 21 , 34 , 55 , 89 , 144 , 233 , 377 , 610 , 987 , 1597 , 2584 , 4181 , 6765 , 10946 ,

In this example I have created the series using a while loop .Like this we can make Fibonacci Series using for loops also in PHP .