Calculate age from datebirth sql field? - php

Question

This is the query I am using and it is in page 1 not inside the function.
<?php
$sql2= mysql_query("SELECT *
FROM catego WHERE category_id = '$idc'");
$categoryCount = mysql_num_rows($sql2);
if ($categoryCount>0 )
{
$row2 = mysql_fetch_array($sql2);
$id = $row2["category_id"];
$birthdate = $row2["birthdate"];
$address = $row2["address"];
}
?>

Answer 1

SELECT YEAR(SUBDATE(NOW(), INTERVAL DATE_FORMAT("1975,09,02", "%Y-%m") YEAR_MONTH)) fs_age;

Answer 2

A simple php function could be something like the following:
function birth_date ($birth_date){
list($y,$m,$d) = explode(",",$birth_date);
$y_diff = date("Y") - $y;
$m_diff = date("m") - $m;
$d_diff = date("d") - $d;
if ($m_diff < 0 || $d_diff < 0) { $y_diff--; }
return $y_diff;
}
i.e split on your commas, work out the differences, adjust for which side of their birthdate the day/month is, if so reduce the year by one, then just return the year.
Then in your page you can put:
<li><span class="label">Age:</spa><?php$age = getage($birthdate); echo $age;?> </li>
EDIT:
<?php
function birth_date($birth_date){
list($y,$m,$d) = explode(",",$birth_date);
$y_diff = date("Y") - $y;
$m_diff = date("m") - $m;
$d_diff = date("d") - $d;
if ($m_diff < 0 || $d_diff < 0) { $y_diff--; }
return $y_diff;
}
$sql2= mysql_query("SELECT * FROM catego WHERE category_id = '$idc'");
$categoryCount = mysql_num_rows($sql2);
if ($categoryCount>0 )
{
$row2 = mysql_fetch_array($sql2);
$id = $row2["category_id"];
$birthdate = $row2["birthdate"];
$address = $row2["address"];
$age = birth_date($birthdate);
}
?>

Answer 3

In PHP, there are a few ways to do this. Here are some good resources:
http://snippets.dzone.com/posts/show/1310
http://www.dreamincode.net/forums/topic/19953-calculating-age-tutorial/

Answer 4

Like this, in your language of choice:
function getAge(dateOfBirth)
{
DateTime now = DateTime.Today;
int years = now.Year - dateOfBirth.Year;
// subtract another year if we're before the birth day in the current year
if (now.Month < dateOfBirth.Month || (now.Month == dateOfBirth.Month && now.Day < dateOfBirth.Day))
--years;
return years;
}