将本地时间响应转换为1970年以来的秒数[关闭]

Question

I need to get the number of seconds since 1970 untill the time I got after calling localtime. Is there a simple way to convert what is returning from localtime (1393340639) for example back to seconds?

Answer 1

Do not use localtime. Since PHP 5.2 was release, back last November 2nd 2006, you can use DateTime which offers a better interface to play with time, and which is compatible with UNIX timestamps (what you're looking for).

** Edit **

For example :

// always work with UTC!
date_default_timezone_set('UTC');

// support your legacy need...
$lt = localtime(1393340639);

$dt = new DateTime();
// Note : DateTime's year is 0 based, while localtime's 1900 based, so we add 1900
// Note : DateTime's month is 1 based, while localtime's 0 based, so we add 1
$dt->setDate($lt[5] + 1900, $lt[4] + 1, $lt[3]);
$dt->setTime($lt[2], $lt[1], $lt[0]);
//$dt->setTimestamp(1393340639);  // <-- SAME THING!

var_dump($dt);
// output:
// object(DateTime)#1 (3) {
//  ["date"]=>
//  string(19) "2014-02-25 15:03:59"
//  ["timezone_type"]=>
//  int(3)
//  ["timezone"]=>
//  string(3) "UTC"
// }

echo $dt->getTimestamp();
// output: 1393340639 (which is your initial timestamp value)

You're better off not using localtime altogether, though. Just pass a DateTime object around.