PHP get astrological sign by date

astro.php

<?php
function getsign($day,$month) {
	if(($month==1 && $day>20)||($month==2 && $day<20)) {
		$mysign = "aquarius";
	}
	if(($month==2 && $day>18 )||($month==3 && $day<21)) {
		$mysign = "pisces";
	}
	if(($month==3 && $day>20)||($month==4 && $day<21)) {
		$mysign = "aries";
	}
	if(($month==4 && $day>20)||($month==5 && $day<22)) {
		$mysign = "taurus";
	}
	if(($month==5 && $day>21)||($month==6 && $day<22)) {
		$mysign = "gemini";
	}
	if(($month==6 && $day>21)||($month==7 && $day<24)) {
		$mysign = "cancer";
	}
	if(($month==7 && $day>23)||($month==8 && $day<24)) {
		$mysign = "leo";
	}
	if(($month==8 && $day>23)||($month==9 && $day<24)) {
		$mysign = "virgo";
	}
	if(($month==9 && $day>23)||($month==10 && $day<24)) {
		$mysign = "libra";
	}
	if(($month==10 && $day>23)||($month==11 && $day<23)) {
		$mysign = "scorpio";
	}
	if(($month==11 && $day>22)||($month==12 && $day<23)) {
		$mysign = "sagittarius";
	}
	if(($month==12 && $day>22)||($month==1 && $day<21)) {
		$mysign = "capricorn";
	}
	return $mysign;
}
print_r(getsign(16,7));
?>

February 19th should be Aquarius, but your script puts them as Pisces
if(...($month==2 && $day<20)) { $mysign = "aquarius";
if(($month==2 && $day>18 )...) {$mysign = "pisces";