日期/时间转换为自PHP以来的时间

/**
 * Returns rough (in largest single unit) time elapsed between two times.
 * @param int $iTime0  Initial time,as time_t.
 * @param int $iTime1  Final time,as time_t. 0=use current time.
 * @return string Time elapsed,like "5 minutes" or "3 days" or "1 month".
 *              You might print "ago" after this return if $iTime1 is now.
 * @author Dan Kamins - dos at axonchisel dot net
 */
function ax_getRoughTimeElapsedAsText($iTime0,$iTime1 = 0)
{
    if ($iTime1 == 0) { $iTime1 = time(); }
    $iTimeElapsed = $iTime1 - $iTime0;

    if ($iTimeElapsed < (60)) {
        $iNum = intval($iTimeElapsed); $sUnit = "second";
    } else if ($iTimeElapsed < (60*60)) {
        $iNum = intval($iTimeElapsed / 60); $sUnit = "minute";
    } else if ($iTimeElapsed < (24*60*60)) {
        $iNum = intval($iTimeElapsed / (60*60)); $sUnit = "hour";
    } else if ($iTimeElapsed < (30*24*60*60)) {
        $iNum = intval($iTimeElapsed / (24*60*60)); $sUnit = "day";
    } else if ($iTimeElapsed < (365*24*60*60)) {
        $iNum = intval($iTimeElapsed / (30*24*60*60)); $sUnit = "month";
    } else {
        $iNum = intval($iTimeElapsed / (365*24*60*60)); $sUnit = "year";
    }

    return $iNum . " " . $sUnit . (($iNum != 1) ? "s" : "");
}

要使用此func,您需要先将时间转换为time_t格式(自“epoch”以来整数#seconds).这些PHP函数中的任何一个都可能有助于：http://php.net/strptime或http://php.net/strtotime.