# Fibonacci series of numbers in PHP

In Fibonacci series of numbers, each number is the sum of the two preceding ones.
``0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377``
Fn = F(n-1) + F(n-2)

Generating Fibonacci series in PHP where any number is sum of previous two numbers

## Generating Fibonacci series using for loop

We will use for loop to generate the series.
``````\$n1=1; // first number
\$n2=0; // second number
for(\$i=0;\$i<=15;\$i++){
echo " \$n2,";
\$temp=\$n1+\$n2; // temporary variable
\$n1=\$n2;   // \$n2 value shifted to \$n1
\$n2=\$temp; // temporary value ( sum ) is shifted.
}``````
Output
``0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610,``

## Using recursive function

``````function fibo(\$n){
if(\$n<=1){
return \$n;}
else{
return (fibo(\$n-1)+fibo(\$n-2));
}
}

for (\$i=0;\$i<15;\$i++){
echo fibo(\$i).", ";
}``````
Output
``0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377,`` ## Subscribe

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