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@ 2013-07-20T07:35:35Z

<?php

$bithdayDate = "1993-08-20";
$tdate = date("Y-m-d");
$age = 0;
while( $tdate > $dob = strtotime('+1 year', $bithdayDate))
{
    ++$age;
}
echo $age;

$bithdayDate = "1993-08-20";
$date = new DateTime($bithdayDate);
$now = new DateTime();
$interval = $now->diff($date);
echo $interval->y;

Output
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References
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date: documentation ( source)
strtotime: documentation ( source)

preferences:dark modelive preview

36.16 ms | 402 KiB | 5 Q