- pow: documentation ( source)
<?php
$guessedLoanPeriod = 1;
$getInterestRate = 0;
$x = 1 - pow(1 + ($getInterestRate/ 100 / 12), $guessedLoanPeriod);
echo (-(
($getInterestRate / 100 / 12)
* (
200
- 0
+ 50
)
* pow(1 + ($getInterestRate / 100 / 12), $guessedLoanPeriod)
/ (1 - pow(1 + ($getInterestRate / 100 / 12), $guessedLoanPeriod))
) + 6
) * $guessedLoanPeriod;