Calculate age from birthdate in php 5.2 [duplicate] - php

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This question already has answers here:
PHP calculate age
(36 answers)
Closed 9 years ago.
i can't upgrade my php to 5.3 due to upgrade costs and such. Anyone knows how to calculate age using birthdate in php 5.2 ?
I made a simple form that takes in the day month and year of a person's birthdate in select boxes. it goes in the form of dd,mm,yyyy. When submitted, the function should calculate the age of the person.
Calculate Age
<?php
if (isset($_POST['submit'])) {
$d=$_POST['day'];
$m=$_POST['month'];
$y=$_POST['year'];
//converting Inputed DOB in "dd-mm-yyyy" format
$dob=$d.' '.$m.' '.$y;
//Create a new date object with current system date
//$bday=new DateTime($dob);
//Differentiating both dates
//$age = $bday->diff(new DateTime);
//$birthdate = mysql_prep($dob);
//$c_age = $age->y;
//$dob = new DateTime('$dob');
$dob = new DateTime('$dob');
$now = new DateTime('now');
echo year_diff($now, $dob);
function year_diff($date1, $date2) {
list($year1, $dayOfYear1) = explode(' ', $date1->format('Y z'));
list($year2, $dayOfYear2) = explode(' ', $date2->format('Y z'));
return $year1 - $year2 - ($dayOfYear1 < $dayOfYear2);
}
}
?>
<form action="testage.php" method="post">
Date Of Birth:<br />
<td>Day<br/>
<select name="day"> <!-- To Select Day -->
<option value="01" selected="selected">01</option>
<option value="02">02</option>
<option value="03">03</option>
<option value="04">04</option>
<option value="05">05</option>
<option value="06">06</option>
<option value="07">07</option>
<option value="08">08</option>
<option value="09">09</option>
<option value="10">10</option>
<option value="11">11</option>
<option value="12">12</option>
<option value="13">13</option>
<option value="14">14</option>
<option value="15">15</option>
<option value="16">16</option>
<option value="17">17</option>
<option value="18">18</option>
<option value="19">19</option>
<option value="20">20</option>
<option value="21">21</option>
<option value="22">22</option>
<option value="23">23</option>
<option value="24">24</option>
<option value="25">25</option>
<option value="26">26</option>
<option value="27">27</option>
<option value="28">28</option>
<option value="29">29</option>
<option value="30">30</option>
<option value="31">31</option>
<option value="32">32</option>
</select>
Month
<select name="month"><!--TO Select Month-->
<option value="01" selected="selected">Jan</option>
<option value="02">Feb</option>
<option value="03">Mar</option>
<option value="04">Apr</option>
<option value="05">May</option>
<option value="06">Jun</option>
<option value="07">Jul</option>
<option value="08">Aug</option>
<option value="09">Sep</option>
<option value="10">Oct</option>
<option value="11">Nov</option>
<option value="12">Dec</option>
</select>
Year
<select name="year"><!--To Select Year-->
<option value="2013" selected="selected">2013</option>
<option value="2012">2012</option>
<option value="2011">2011</option>
<option value="2010">2010</option>
<option value="2009">2009</option>
<option value="2008">2008</option>
<option value="2007">2007</option>
<option value="2006">2006</option>
<option value="2005">2005</option>
<option value="2004">2004</option>
<option value="2003">2003</option>
<option value="2002">2002</option>
<option value="2001">2001</option>
<option value="2000">2000</option>
<option value="1999">1999</option>
<option value="1998">1998</option>
<option value="1997">1997</option>
<option value="1996">1996</option>
<option value="1995">1995</option>
<option value="1994">1994</option>
<option value="1993">1993</option>
<option value="1992">1992</option>
<option value="1991">1991</option>
<option value="1990">1990</option>
<option value="1989">1989</option>
<option value="1988">1988</option>
<option value="1987">1987</option>
<option value="1986">1986</option>
<option value="1985">1985</option>
<option value="1984">1984</option>
<option value="1983">1983</option>
<option value="1982">1982</option>
<option value="1981">1981</option>
<option value="1980">1980</option>
<option value="1979">1979</option>
<option value="1978">1978</option>
<option value="1977">1977</option>
<option value="1976">1976</option>
<option value="1975">1975</option>
<option value="1974">1974</option>
<option value="1973">1973</option>
<option value="1972">1972</option>
<option value="1971">1971</option>
<option value="1970">1970</option>
<option value="1969">1969</option>
<option value="1968">1968</option>
<option value="1967">1967</option>
<option value="1966">1966</option>
<option value="1965">1965</option>
<option value="1964">1964</option>
<option value="1963">1963</option>
<option value="1962">1962</option>
<option value="1961">1961</option>
<option value="1960">1960</option>
<option value="1959">1959</option>
<option value="1958">1958</option>
<option value="1957">1957</option>
<option value="1956">1956</option>
<option value="1955">1955</option>
<option value="1954">1954</option>
<option value="1953">1953</option>
<option value="1952">1952</option>
<option value="1951">1951</option>
<option value="1950">1950</option>
<option value="1949">1949</option>
<option value="1948">1948</option>
<option value="1947">1947</option>
<option value="1946">1946</option>
<option value="1945">1945</option>
<option value="1944">1944</option>
<option value="1943">1943</option>
<option value="1942">1942</option>
<option value="1941">1941</option>
<option value="1940">1940</option>
<option value="1939">1939</option>
<option value="1938">1938</option>
<option value="1937">1937</option>
</select>
<input type="submit" name="submit" value="Submit"/>
</form>

Answer 1

I think this is correct.
function CurrentAge($d, $m, $y)
{
$years = date('Y') - $y;
$months = date('m') - $m;
$days = date('d') - $d;
if (substr($months, 0, 1) == '-') {
$years = $years - 1;
$months = 12 - substr($months, 1);
}
if (substr($days, 0, 1) == '-') {
$days = date('t') - substr($days, 1);
}
return $years;
}
echo CurrentAge('21', '02', '1993');