Online PHP editor | output for IHdYc

<?php function percentYear($a, $b) { //Takes in two dates and returns the decimal of days per year for that specific year // I made this in order to fix the issue of leap years. if(strtotime($a)<strtotime($b)){ list($a, $b) = array($b, $a); } $aYearDay = date("z", strtotime($a)) + 1; $aYearDays = date("z", strtotime(date("Y", strtotime($a))."-12-31")) + 1; $aPercent = $aYearDay/$aYearDays; $bYearDay = date("z", strtotime($b)) + 1; $bYearDays = date("z", strtotime(date("Y", strtotime($b))."-12-31")) + 1; $bPercent = $bYearDay/$bYearDays; if(date("Y", strtotime($a))!=date("Y", strtotime($b))) { $aPercent += abs(date("Y", strtotime($a))-date("Y", strtotime($b))); } return abs($aPercent-$bPercent); } var_dump( percentYear("2013-02-04", "2012-02-04")); var_dump( percentYear("2011-02-04", "2010-02-04"));