PHP: Calculating months and interest rate. Is this solution correct? It does work -


i want calculate how many months have passed since x1 date x2 date, , calculate how have pay given monthly interest rate.

the script should: amount of debt (capital), month , year when debt originated , until should calculated. not day, month , year. , output should total generated in interests, , total months between 2 dates.

i have these initial variables:

$tmonth = $_post['tmes']; $tyear = $_post['tanio']; $interes = $_post['interes']; $fmonth = $_post['fmes']; $fyear = $_post['fanio']; $capital = $_post['capital'];

and i've done:

if($_server['request_method']=='post') {     //i try , obtain how many months have between 2 months     $mesesenanios = (($tyear - $fyear) -1) * 12;     $mesesscattered = (12 - $fmonth) + $tmonth;     $mesestotales = $mesesenanios + $mesesscattered;      //then calculate interest i'll have pay     $totalcapital = $capital * ($interes * $mesestotales) / 100;      echo 'son $'.$totalcapital.' en '.$mesestotales.' meses.'; ...

i've tried script , works. don't know php (nor math) , don´t know if work.

i've researched other solutions here @ so, think mine little easier - @ least understand :) - maybe it´s because it's not correct?

no, wrong.

$mesesenanios = (($tyear - $fyear) -1) * 12;

that example: (2013 - 2012 - 1) = 0

0 * 12 = 0, while obvious 12.

then do

$mesesscattered = (12 - $fmonth) + $tmonth;

so, lets have 05-2013 (month - year) , 05-2012. result should be: 12 months. lets assume fixed first line pointed out, 12 months that. on second line, 12 - 5, 7. result 7+12 = 19.. again obvious wrong.

to make easy, ill give code..

$months = (($tyear - $fyear ) * 12) + ($tmonth- $fmonth);

you first check if there extra's years , amount * 12 12 months have. 0 years give 0 months, 1 year gives 12 months etc. after check months. if first value 8 months , second value 6 months, have 2 months in total , add value on top of value got years calculation.

that month part, other part cannot since not know calculation. yet assuming have 0 experience in math , php (like said), recommend manually calculate it, , compare result script.


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