How to check whether a number is Fibonacci or not in PHP?
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How to check whether a number is Fibonacci or not in PHP?
1 answer
Member
@loy You can use the function isFibonacci() below as example to check whether if a number is fibonacci or not in PHP:
<?php
function isFibonacci(int $number): bool
{
$a = 0;
$b = 1;
if ($number == $a || $number == $b) {
return true;
}
$sum = $a + $b;
while ($sum <= $number) {
if ($sum == $number) {
return true;
}
$a = $b;
$b = $sum;
$sum = $a + $b;
}
return false;
}
// Output: true
var_dump(isFibonacci(5));
// Output: false
var_dump(isFibonacci(6));
// Output: true
var_dump(isFibonacci(13));
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