time.php

来自「Cake Framwork , Excellent」· PHP 代码 · 共 538 行 · 第 1/2 页

 */
	function toAtom($dateString, $userOffset = null) {
		$date = $this->fromString($dateString, $userOffset);
		$ret = date('Y-m-d\TH:i:s\Z', $date);
		return $this->output($ret);
	}
/**
 * Formats date for RSS feeds
 *
 * @param string $dateString Datetime string or Unix timestamp
 * @param int $userOffset User's offset from GMT (in hours)
 * @return string Formatted date string
 */
	function toRSS($dateString, $userOffset = null) {
		$date = $this->fromString($dateString, $userOffset);
		$ret = date("r", $date);
		return $this->output($ret);
	}
/**
 * Returns either a relative date or a formatted date depending
 * on the difference between the current time and given datetime.
 * $datetime should be in a <i>strtotime</i>-parsable format, like MySQL's datetime datatype.
 *
 * Options:
 *  'format' => a fall back format if the relative time is longer than the duration specified by end
 *  'end' =>  The end of relative time telling
 *  'userOffset' => Users offset from GMT (in hours)
 *
 * Relative dates look something like this:
 *	3 weeks, 4 days ago
 *	15 seconds ago
 * Formatted dates look like this:
 *	on 02/18/2004
 *
 * The returned string includes 'ago' or 'on' and assumes you'll properly add a word
 * like 'Posted ' before the function output.
 *
 * @param string $dateString Datetime string or Unix timestamp
 * @param array $options Default format if timestamp is used in $dateString
 * @return string Relative time string.
 */
	function timeAgoInWords($dateTime, $options = array()) {
		$userOffset = null;
		if (is_array($options) && isset($options['userOffset'])) {
			$userOffset = $options['userOffset'];
		}
		$in_seconds = $this->fromString($dateTime, $userOffset);
		$backwards = ($in_seconds > time());

		$format = 'j/n/y';
		$end = '+1 month';
		$now = 	time();

		if (is_array($options)) {
			if (isset($options['format'])) {
				$format = $options['format'];
				unset($options['format']);
			}
			if (isset($options['end'])) {
				$end = $options['end'];
				unset($options['end']);
			}
		} else {
			$format = $options;
		}

		if ($backwards) {
			$future_time = $in_seconds;
			$past_time = $now;
		} else {
			$future_time = $now;
			$past_time = $in_seconds;
		}
		$diff = $future_time - $past_time;

		// If more than a week, then take into account the length of months
		if ($diff >= 604800) {
			$current = array();
			$date = array();
			
			list($future['H'], $future['i'], $future['s'], $future['d'], $future['m'], $future['Y']) = explode('/', date('H/i/s/d/m/Y', $future_time));

			list($past['H'], $past['i'], $past['s'], $past['d'], $past['m'], $past['Y']) = explode('/', date('H/i/s/d/m/Y', $past_time));
			$years = $months = $weeks = $days = $hours = $minutes = $seconds = 0;

			if ($future['Y'] == $past['Y'] && $future['m'] == $past['m']) {
				$months = 0;
				$years = 0;
			} else {
				if ($future['Y'] == $past['Y']) {
					$months = $future['m'] - $past['m'];
				} else {
					$years = $future['Y'] - $past['Y'];
					$months = $future['m'] + ((12 * $years) - $past['m']);
					
					if ($months >= 12) {
						$years = floor($months / 12);
						$months = $months - ($years * 12);
					}
					
					if ($future['m'] < $past['m'] && $future['Y'] - $past['Y'] == 1) {
						$years --;
					}
				}
			}

			if ($future['d'] >= $past['d']) {
				$days = $future['d'] - $past['d'];
			} else {
				$days_in_past_month = date('t', $past_time);
				$days_in_future_month = date('t', mktime(0, 0, 0, $future['m'] - 1, 1, $future['Y']));

				if (!$backwards) {
					$days = ($days_in_past_month - $past['d']) + $future['d'];
				} else {
					$days = ($days_in_future_month - $past['d']) + $future['d'];
				}

				if ($future['m'] != $past['m']) {
					$months --;
				}
			}

			if ($months == 0 && $years >= 1 && $diff < ($years * 31536000)){
				$months = 11;
				$years --;
			}

			if ($months >= 12) {
				$years = $years + 1;
				$months = $months - 12;
			}

			if ($days >= 7) {
				$weeks = floor($days / 7);
				$days = $days - ($weeks * 7);
			}
		} else {
			$years = $months = $weeks = 0;
			$days = floor($diff / 86400);

			$diff = $diff - ($days * 86400);

			$hours = floor($diff / 3600);
			$diff = $diff - ($hours * 3600);

			$minutes = floor($diff / 60);
			$diff = $diff - ($minutes * 60);
			$seconds = $diff;
		}
		$relative_date = '';
		$diff = $future_time - $past_time;

		if ($diff > abs($now - $this->fromString($end))) {
			$relative_date = 'on ' . date($format, $in_seconds);
		} else {
			if ($years > 0) {
				// years and months and days
				$relative_date .= ($relative_date ? ', ' : '') . $years . ' year' . ($years > 1 ? 's' : '');
				$relative_date .= $months > 0 ? ($relative_date ? ', ' : '') . $months . ' month' . ($months > 1 ? 's' : '') : '';
				$relative_date .= $weeks > 0 ? ($relative_date ? ', ' : '') . $weeks . ' week' . ($weeks > 1 ? 's' : '') : '';	
				$relative_date .= $days > 0 ? ($relative_date ? ', ' : '') . $days . ' day' . ($days > 1 ? 's' : '') : '';
			} elseif (abs($months) > 0) {
				// months, weeks and days
				$relative_date .= ($relative_date ? ', ' : '') . $months . ' month' . ($months > 1 ? 's' : '');
				$relative_date .= $weeks > 0 ? ($relative_date ? ', ' : '') . $weeks . ' week' . ($weeks > 1 ? 's' : '') : '';
				$relative_date .= $days > 0 ? ($relative_date ? ', ' : '') . $days . ' day' . ($days > 1 ? 's' : '') : '';
			} elseif (abs($weeks) > 0) {
				// weeks and days
				$relative_date .= ($relative_date ? ', ' : '') . $weeks . ' week' . ($weeks > 1 ? 's' : '');
				$relative_date .= $days > 0 ? ($relative_date ? ', ' : '') . $days . ' day' . ($days > 1 ? 's' : '') : '';
			} elseif (abs($days) > 0) {
				// days and hours
				$relative_date .= ($relative_date ? ', ' : '') . $days . ' day' . ($days > 1 ? 's' : '');
				$relative_date .= $hours > 0 ? ($relative_date ? ', ' : '') . $hours . ' hour' . ($hours > 1 ? 's' : '') : '';
			} elseif (abs($hours) > 0) {
				// hours and minutes
				$relative_date .= ($relative_date ? ', ' : '') . $hours . ' hour' . ($hours > 1 ? 's' : '');
				$relative_date .= $minutes > 0 ? ($relative_date ? ', ' : '') . $minutes . ' minute' . ($minutes > 1 ? 's' : '') : '';
			} elseif (abs($minutes) > 0) {
				// minutes only
				$relative_date .= ($relative_date ? ', ' : '') . $minutes . ' minute' . ($minutes > 1 ? 's' : '');
			} else {
				// seconds only
				$relative_date .= ($relative_date ? ', ' : '') . $seconds . ' second' . ($seconds != 1 ? 's' : '');
			}

			if (!$backwards) {
				$relative_date .= ' ago';
			}
		}
		return $this->output($relative_date);
	}
/**
 * Alias for timeAgoInWords
 *
 * @param mixed $dateTime Datetime string (strtotime-compatible) or Unix timestamp
 * @param mixed $options Default format string, if timestamp is used in $dateTime, or an array of options to be passed
 *						 on to timeAgoInWords().
 * @return string Relative time string.
 * @see		TimeHelper::timeAgoInWords
 */
	function relativeTime($dateTime, $options = array()) {
		return $this->timeAgoInWords($dateTime, $options);
	}
/**
 * Returns true if specified datetime was within the interval specified, else false.
 *
 * @param mixed $timeInterval the numeric value with space then time type. Example of valid types: 6 hours, 2 days, 1 minute.
 * @param int $userOffset User's offset from GMT (in hours)
 * @param mixed $dateString the datestring or unix timestamp to compare
 * @return bool
 */
	function wasWithinLast($timeInterval, $dateString, $userOffset = null) {
		$tmp = r(' ', '', $timeInterval);
		if (is_numeric($tmp)) {
			$timeInterval = $tmp.' days';
		}

		$date = $this->fromString($dateString, $userOffset);
		$interval = $this->fromString('-'.$timeInterval);

		if ($date >= $interval && $date <= time()) {
			return true;
		}

		return false;
	}
/**
 * Returns gmt, given either a UNIX timestamp or a valid strtotime() date string.
 *
 * @param string $dateString Datetime string
 * @return string Formatted date string
 */
	function gmt($string = null) {
		if ($string != null) {
			$string = $this->fromString($string);
		} else {
			$string = time();
		}
		$string = $this->fromString($string);
		$hour = intval(date("G", $string));
		$minute = intval(date("i", $string));
		$second = intval(date("s", $string));
		$month = intval(date("n", $string));
		$day = intval(date("j", $string));
		$year = intval(date("Y", $string));

		$return = gmmktime($hour, $minute, $second, $month, $day, $year);
		return $return;
	}
/**
 * Returns a UNIX timestamp, given either a UNIX timestamp or a valid strtotime() date string.
 *
 * @param string $dateString Datetime string
 * @param boolean $invalid flag to ignore results of fromString == false
 * @param int $userOffset User's offset from GMT (in hours)
 * @return string Formatted date string
 */
	function format($format = 'd-m-Y', $date, $invalid = false, $userOffset = null) {
		$date = $this->fromString($date, $userOffset);
		if ($date === false && $invalid !== false) {
			return $invalid;
		} 
		return date($format, $date);
	}
}

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