PHP: Get Age Comparison Results of 3 Functions

Perhaps I'll blog in detail more about these functions later, but for now, I'm going to present to you 3 of the more popular age formulas and the results I've found.
ALERT: function getAge_2 seems to be the most popular one I've found on the net and is the one that tends to be wrong!
First, the functions

function getAge_1($date) { // Y-m-d format
 $now = explode("-", date('Y-m-d'));
 $dob = explode("-", $date);
 $dif = $now[0] - $dob[0];
 if ($dob[1] > $now[1]) { // birthday month has not hit this year
  $dif -= 1;
 }
 elseif ($dob[1] == $now[1]) { // birthday month is this month, check day
  if ($dob[2] > $now[2]) {
   $dif -= 1;
  }
  elseif ($dob[2] == $now[2]) { // Happy Birthday!
   //$dif = $dif." Happy Birthday!";
  };
 };
 return $dif;
}

function getAge_2($date) { // Y-m-d format
 return floor((time() - strtotime($date))/(60*60*24*365.2425));
}

function getAge_3($date) { // Y-m-d format
 return intval(substr(date('Ymd') - date('Ymd', strtotime($date)), 0, -4));
}

The following results span 100 years from 1/1/1902 to today, 3/29/2012. As you will see in the following two tables, the key difference was found in getting the age of someone with a birthday tomorrow, expect on some years before 1932 where the difference was also found for the day AFTER tomorrow.

The Difference Table
Year	getAge_1	getAge_2	getAge_3
*1902-03-30* 109 110 109 *1903-03-30* 108 109 108 *1903-03-31* 108 109 108 *1904-03-30* 107 108 107 *1905-03-30* 106 107 106 *1906-03-30* 105 106 105 *1907-03-30* 104 105 104 *1907-03-31* 104 105 104 *1908-03-30* 103 104 103 *1909-03-30* 102 103 102 *1910-03-30* 101 102 101 *1911-03-30* 100 101 100 *1911-03-31* 100 101 100 *1912-03-30* 99 100 99 *1913-03-30* 98 99 98 *1914-03-30* 97 98 97 *1915-03-30* 96 97 96 *1915-03-31* 96 97 96 *1916-03-30* 95 96 95 *1917-03-30* 94 95 94 *1918-03-30* 93 94 93 *1919-03-30* 92 93 92 *1919-03-31* 92 93 92 *1920-03-30* 91 92 91 *1921-03-30* 90 91 90 *1922-03-30* 89 90 89 *1923-03-30* 88 89 88 *1923-03-31* 88 89 88 *1924-03-30* 87 88 87 *1925-03-30* 86 87 86 *1926-03-30* 85 86 85 *1927-03-30* 84 85 84 *1927-03-31* 84 85 84 *1928-03-30* 83 84 83 *1929-03-30* 82 83 82 *1930-03-30* 81 82 81 *1931-03-30* 80 81 80 *1931-03-31* 80 81 80 *1932-03-30* 79 80 79 *1933-03-30* 78 79 78 *1934-03-30* 77 78 77 *1935-03-30* 76 77 76 *1935-03-31* 76 77 76 *1936-03-30* 75 76 75 *1937-03-30* 74 75 74 *1938-03-30* 73 74 73 *1939-03-30* 72 73 72 *1940-03-30* 71 72 71 *1941-03-30* 70 71 70 *1942-03-30* 69 70 69 *1943-03-30* 68 69 68 *1944-03-30* 67 68 67 *1945-03-30* 66 67 66 *1946-03-30* 65 66 65 *1947-03-30* 64 65 64 *1948-03-30* 63 64 63 *1949-03-30* 62 63 62 *1950-03-30* 61 62 61 *1951-03-30* 60 61 60 *1952-03-30* 59 60 59 *1953-03-30* 58 59 58 *1954-03-30* 57 58 57 *1955-03-30* 56 57 56 *1956-03-30* 55 56 55 *1957-03-30* 54 55 54 *1958-03-30* 53 54 53 *1959-03-30* 52 53 52 *1960-03-30* 51 52 51 *1961-03-30* 50 51 50 *1962-03-30* 49 50 49 *1963-03-30* 48 49 48 *1964-03-30* 47 48 47 *1965-03-30* 46 47 46 *1966-03-30* 45 46 45 *1967-03-30* 44 45 44 *1968-03-30* 43 44 43 *1969-03-30* 42 43 42 *1970-03-30* 41 42 41 *1971-03-30* 40 41 40 *1973-03-30* 38 39 38 *1974-03-30* 37 38 37 *1975-03-30* 36 37 36 *1977-03-30* 34 35 34 *1978-03-30* 33 34 33 *1979-03-30* 32 33 32 *1981-03-30* 30 31 30 *1982-03-30* 29 30 29 *1983-03-30* 28 29 28 *1985-03-30* 26 27 26 *1986-03-30* 25 26 25 *1987-03-30* 24 25 24 *1989-03-30* 22 23 22 *1990-03-30* 21 22 21 *1991-03-30* 20 21 20 *1993-03-30* 18 19 18 *1994-03-30* 17 18 17 *1995-03-30* 16 17 16 *1997-03-30* 14 15 14 *1998-03-30* 13 14 13 *1999-03-30* 12 13 12 *2001-03-30* 10 11 10 *2002-03-30* 9 10 9 *2003-03-30* 8 9 8 *2005-03-30* 6 7 6 *2006-03-30* 5 6 5 *2007-03-30* 4 5 4 *2010-03-30* 1 2 1 *2011-03-30* 0 1 0

The Full table was way to big, so i'll find another way to show it later, gota get back to the grind, this was just to help others know! Laters!