A simple way to work out the length of time between two dates in PHP is to use the difference between Unix timestamps.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="EN" lang="EN">
<head>
<title>Calculating Dates in PHP</title>
<meta Name="Author" Content="Hann So">
</head>
<body>
<p>
<?php
if (isset($_POST['submit'])) {
process_form();
}
else {
display_form();// display form for the first time
}
function display_form() {
echo <<<HTML
<h2>Calculate the age based on birthdate</h2>
<form action = "$_SERVER[SCRIPT_NAME]" method="post">
Month:
<input type="text" name="mm" size="50" value="07" />
<br />
Day:
<input type="text" name="dd" size="50" value="04" />
<br />
Year:
<input type="text" name="yy" size="50" value="1972" />
<br />
<input type="submit" name="submit" value="Submit" />
</form>
HTML;
}
function process_form() {
$mm = "$_POST[mm]";
$dd = "$_POST[dd]";
$yy = "$_POST[yy]";
$bday = mktime(0,0,0, $mm, $dd, $yy);
$today = time();
$ageunix = $today - $bday;
// convert from seconds to year
$age = floor($ageunix / (365*24*60*60));
echo "The age is $age<br />";
echo "<p><a href=\"$_SERVER[SCRIPT_NAME]\">Try again?</a></p>\n";
}
?>
</p>
</body>
</html>
|