PHP to judge the function of a constellation based on a specific date

Now it seems quite popular to discuss Constellation, the following author shares a function that uses PHP to determine which constellation a date belongs to. The specific function code is as follows:

function constellation ($month, $day) {
	//check parameter validity http://www. alixixi.com/
	if ($month <1$month>12$day<1$day>31) return false;	
	Constellation name and start date
	$constellations =array (Array ("=>" "Aquarius"
		),
		array ("=>" "Pisces"),
		Array ("21" = > "Aries"), Array ("
		=>"), Array ("=>" "Gemini"
		),
		array ("=>" "Cancer"),
		Array ("23" = > "Leo"), Array ("=>" "
		Virgo"),
		Array ("=>" "Libra"), Array ("=>",
		"Scorpio"),
		Array ("22 "=>" ("Sagittarius"),
		Array ("=>" "Capricorn")
	);
	List ($constellation _start, $constellation _name) =each ($constellations [(int) $month-1]);
	if ($day < $constellation _start) {
		list ($constellation _start, $constellation _name) =each ($constellations [$ month-2<0)? $month =11: $month-=2]);
	return $constellation _name;
}

Function Call Example:

Echo Constellation (4, 20);

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