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This php function calculates the age in years for a given birthdate in the format YYYY-MM-DD.

This php function calculates the age in years for a given birthdate in the format YYYY-MM-DD.
 
<code class="prettyprint">
function getAge($birthdate)
{
    // get month, day, year
    $tmp = split('-', $birthdate);
    $month = (int)$tmp[1]; $day = (int) $tmp[2]; $year = (int) $tmp[0];
 
    $current_day_of_year = 1 + date('z');
    $user_day_of_year = 1 + date('z', mktime(1,1,1,$month, $day, $year));
    $years = date('Y') - $year;
 
    // we calculate based on birth day, if we haven't reached user's birthday yet,
    // substract one year
    if ($current_day_of_year < $user_day_of_year) {
        $years--;
    }
 
    return $years;
}
</code></code>

This entry was posted on Monday, July 23rd, 2007 at 4:38 pm and is filed under php, Snippet-library. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.