There are times when a site needs to check the age of a person, usually for legal reasons. This small script shows how to check a person is of a given age, including leap years. Buy using the PHP DateTime class, php is able to account for dates at a system level.
<?php
/**
*
* Check minimum age. Defaults to 18 years
*
* @param string $dob The date of birth
* @param int
* @return bool
*
*/
function validate_age( $dob, $min_age=18 )
{
$dob = new DateTime( $dob );
$min_age = new DateTime( 'now - ' . $min_age . 'years' );
return $dob <= $min_age;
}
?>
USAGE
<?php
/**
*
* Check minimum age. Defaults to 18 years
*
* @param string $dob The date of birth
* @param int
* @return bool
*
*/
function validate_age( $dob, $min_age=18 )
{
$dob = new DateTime( $dob );
$min_age = new DateTime( 'now - ' . $min_age . 'years' );
return $dob <= $min_age;
}
// the person must be at least 21 years of age
$age = 21;
// persons date of birth (dd-mm-yyyy)
$dob = '20-4-1981';
if( validate_age( $dob, $age ) === false )
{
echo 'Person is not 21 years old';
}
else
{
echo 'Person is 21 or over';
}
?>
