<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>年/月/日のデータをタイムスタンプに変換したい</title>
</head>
<body>
<?php
$originalDate = '2009/2/28';
$date = explode('/', $originalDate);
$year = $date['0'];
$month = $date['1'];
$day = $date['2'];
$timeStamp = mktime(0, 0, 0, $month, $day, $year);
echo '<p>元の日付: ' . $originalDate . '</p>';
echo 'UNIXタイムスタンプ: ' . $timeStamp . '<br />';
echo 'date()関数で変換処理: ' . date('Y/m/d', $timeStamp);
$originalDate = '2009/2/30';
$date = explode('/', $originalDate);
$year = $date['0'];
$month = $date['1'];
$day = $date['2'];
$timeStamp = mktime(0, 0, 0, $month, $day, $year);
echo '<p>元の日付: ' . $originalDate . '</p>';
echo 'UNIXタイムスタンプ: ' . $timeStamp . '<br />';
echo 'date()関数で変換処理: ' . date('Y/m/d', $timeStamp);
?>
</body>
</html>