ci-bonfire / Sprint

system/helpers/date_helper.php

<?php

For compatibility and reusability of your code, PSR1 recommends that a file should introduce either new symbols (like classes, functions, etc.) or have side-effects (like outputting something, or including other files), but not both at the same time. The first symbol is defined on line 63 and the first side effect is on line 38.

/**
 * CodeIgniter
 *
 * An open source application development framework for PHP
 *
 * This content is released under the MIT License (MIT)
 *
 * Copyright (c) 2014 - 2015, British Columbia Institute of Technology
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @package	CodeIgniter
 * @author	EllisLab Dev Team
 * @copyright	Copyright (c) 2008 - 2014, EllisLab, Inc. (http://ellislab.com/)
 * @copyright	Copyright (c) 2014 - 2015, British Columbia Institute of Technology (http://bcit.ca/)
 * @license	http://opensource.org/licenses/MIT	MIT License
 * @link	http://codeigniter.com
 * @since	Version 1.0.0
 * @filesource
 */
defined('BASEPATH') OR exit('No direct script access allowed');

/**
 * CodeIgniter Date Helpers
 *
 * @package		CodeIgniter
 * @subpackage	Helpers
 * @category	Helpers
 * @author		EllisLab Dev Team
 * @link		http://codeigniter.com/user_guide/helpers/date_helper.html
 */

// ------------------------------------------------------------------------

if ( ! function_exists('now'))
{
	/**
	 * Get "now" time
	 *
	 * Returns time() based on the timezone parameter or on the
	 * "time_reference" setting
	 *
	 * @param	string
	 * @return	int
	 */
	function now($timezone = NULL)
	{
		if (empty($timezone))
		{
			$timezone = config_item('time_reference');
		}

		if ($timezone === 'local' OR $timezone === date_default_timezone_get())
		{
			return time();
		}

		$datetime = new DateTime('now', new DateTimeZone($timezone));
		sscanf($datetime->format('j-n-Y G:i:s'), '%d-%d-%d %d:%d:%d', $day, $month, $year, $hour, $minute, $second);

		return mktime($hour, $minute, $second, $month, $day, $year);
	}
}

// ------------------------------------------------------------------------

if ( ! function_exists('mdate'))
{
	/**
	 * Convert MySQL Style Datecodes
	 *
	 * This function is identical to PHPs date() function,
	 * except that it allows date codes to be formatted using
	 * the MySQL style, where each code letter is preceded
	 * with a percent sign:  %Y %m %d etc...
	 *
	 * The benefit of doing dates this way is that you don't
	 * have to worry about escaping your text letters that
	 * match the date codes.
	 *
	 * @param	string
	 * @param	int
	 * @return	int
	 */
	function mdate($datestr = '', $time = '')
	{
		if ($datestr === '')
		{
			return '';
		}
		elseif (empty($time))
		{
			$time = now();
		}

		$datestr = str_replace(
			'%\\',
			'',
			preg_replace('/([a-z]+?){1}/i', '\\\\\\1', $datestr)
		);

		return date($datestr, $time);
	}
}

// ------------------------------------------------------------------------

if ( ! function_exists('standard_date'))
{
	/**
	 * Standard Date
	 *
	 * Returns a date formatted according to the submitted standard.
	 *
	 * As of PHP 5.2, the DateTime extension provides constants that
	 * serve for the exact same purpose and are used with date().
	 *
	 * @todo	Remove in version 3.1+.
	 * @deprecated	3.0.0	Use PHP's native date() instead.
	 * @link	http://www.php.net/manual/en/class.datetime.php#datetime.constants.types
	 *
	 * @example	date(DATE_RFC822, now()); // default
	 * @example	date(DATE_W3C, $time); // a different format and time
	 *
	 * @param	string	$fmt = 'DATE_RFC822'	the chosen format
	 * @param	int	$time = NULL		Unix timestamp
	 * @return	string
	 */
	function standard_date($fmt = 'DATE_RFC822', $time = NULL)
	{
		if (empty($time))
		{
			$time = now();
		}

		// Procedural style pre-defined constants from the DateTime extension
		if (strpos($fmt, 'DATE_') !== 0 OR defined($fmt) === FALSE)
		{
			return FALSE;
		}

		return date(constant($fmt), $time);
	}
}

// ------------------------------------------------------------------------

if ( ! function_exists('timespan'))
{
	/**
	 * Timespan
	 *
	 * Returns a span of seconds in this format:
	 *	10 days 14 hours 36 minutes 47 seconds
	 *
	 * @param	int	a number of seconds
	 * @param	int	Unix timestamp
	 * @param	int	a number of display units
	 * @return	string
	 */
	function timespan($seconds = 1, $time = '', $units = 7)
	{
		$CI =& get_instance();
		$CI->lang->load('date');

		is_numeric($seconds) OR $seconds = 1;
		is_numeric($time) OR $time = time();
		is_numeric($units) OR $units = 7;

		$seconds = ($time <= $seconds) ? 1 : $time - $seconds;

		$str = array();
		$years = floor($seconds / 31557600);

		if ($years > 0)
		{
			$str[] = $years.' '.$CI->lang->line($years > 1 ? 'date_years' : 'date_year');
		}

		$seconds -= $years * 31557600;
		$months = floor($seconds / 2629743);

		if (count($str) < $units && ($years > 0 OR $months > 0))
		{
			if ($months > 0)
			{
				$str[] = $months.' '.$CI->lang->line($months > 1 ? 'date_months' : 'date_month');
			}

			$seconds -= $months * 2629743;
		}

		$weeks = floor($seconds / 604800);

		if (count($str) < $units && ($years > 0 OR $months > 0 OR $weeks > 0))
		{
			if ($weeks > 0)
			{
				$str[] = $weeks.' '.$CI->lang->line($weeks > 1 ? 'date_weeks' : 'date_week');
			}

			$seconds -= $weeks * 604800;
		}

		$days = floor($seconds / 86400);

		if (count($str) < $units && ($months > 0 OR $weeks > 0 OR $days > 0))
		{
			if ($days > 0)
			{
				$str[] = $days.' '.$CI->lang->line($days > 1 ? 'date_days' : 'date_day');
			}

			$seconds -= $days * 86400;
		}

		$hours = floor($seconds / 3600);

		if (count($str) < $units && ($days > 0 OR $hours > 0))
		{
			if ($hours > 0)
			{
				$str[] = $hours.' '.$CI->lang->line($hours > 1 ? 'date_hours' : 'date_hour');
			}

			$seconds -= $hours * 3600;
		}

		$minutes = floor($seconds / 60);

		if (count($str) < $units && ($days > 0 OR $hours > 0 OR $minutes > 0))
		{
			if ($minutes > 0)
			{
				$str[] = $minutes.' '.$CI->lang->line($minutes > 1 ? 'date_minutes' : 'date_minute');
			}

			$seconds -= $minutes * 60;
		}

		if (count($str) === 0)
		{
			$str[] = $seconds.' '.$CI->lang->line($seconds > 1 ? 'date_seconds' : 'date_second');
		}

		return implode(', ', $str);
	}
}

// ------------------------------------------------------------------------

if ( ! function_exists('days_in_month'))
{
	/**
	 * Number of days in a month
	 *
	 * Takes a month/year as input and returns the number of days
	 * for the given month/year. Takes leap years into consideration.
	 *
	 * @param	int	a numeric month
	 * @param	int	a numeric year
	 * @return	int
	 */
	function days_in_month($month = 0, $year = '')
	{
		if ($month < 1 OR $month > 12)
		{
			return 0;
		}
		elseif ( ! is_numeric($year) OR strlen($year) !== 4)
		{
			$year = date('Y');
		}

		if (defined('CAL_GREGORIAN'))
		{
			return cal_days_in_month(CAL_GREGORIAN, $month, $year);
		}

		if ($year >= 1970)
		{
			return (int) date('t', mktime(12, 0, 0, $month, 1, $year));
		}

		if ($month == 2)
		{
			if ($year % 400 === 0 OR ($year % 4 === 0 && $year % 100 !== 0))
			{
				return 29;
			}
		}

		$days_in_month	= array(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
		return $days_in_month[$month - 1];
	}
}

// ------------------------------------------------------------------------

if ( ! function_exists('local_to_gmt'))
{
	/**
	 * Converts a local Unix timestamp to GMT
	 *
	 * @param	int	Unix timestamp
	 * @return	int
	 */
	function local_to_gmt($time = '')
	{
		if ($time === '')
		{
			$time = time();
		}

		return mktime(
			gmdate('G', $time),
			gmdate('i', $time),
			gmdate('s', $time),
			gmdate('n', $time),
			gmdate('j', $time),
			gmdate('Y', $time)
		);
	}
}

// ------------------------------------------------------------------------

if ( ! function_exists('gmt_to_local'))
{
	/**
	 * Converts GMT time to a localized value
	 *
	 * Takes a Unix timestamp (in GMT) as input, and returns
	 * at the local value based on the timezone and DST setting
	 * submitted
	 *
	 * @param	int	Unix timestamp
	 * @param	string	timezone
	 * @param	bool	whether DST is active
	 * @return	int
	 */
	function gmt_to_local($time = '', $timezone = 'UTC', $dst = FALSE)
	{
		if ($time === '')
		{
			return now();
		}

		$time += timezones($timezone) * 3600;

		return ($dst === TRUE) ? $time + 3600 : $time;
	}
}

// ------------------------------------------------------------------------

if ( ! function_exists('mysql_to_unix'))
{
	/**
	 * Converts a MySQL Timestamp to Unix
	 *
	 * @param	int	MySQL timestamp YYYY-MM-DD HH:MM:SS
	 * @return	int	Unix timstamp
	 */
	function mysql_to_unix($time = '')
	{
		// We'll remove certain characters for backward compatibility
		// since the formatting changed with MySQL 4.1
		// YYYY-MM-DD HH:MM:SS

		$time = str_replace(array('-', ':', ' '), '', $time);

		// YYYYMMDDHHMMSS
		return mktime(
			substr($time, 8, 2),
			substr($time, 10, 2),
			substr($time, 12, 2),
			substr($time, 4, 2),
			substr($time, 6, 2),
			substr($time, 0, 4)
		);
	}
}

// ------------------------------------------------------------------------

if ( ! function_exists('unix_to_human'))
{
	/**
	 * Unix to "Human"
	 *
	 * Formats Unix timestamp to the following prototype: 2006-08-21 11:35 PM
	 *
	 * @param	int	Unix timestamp
	 * @param	bool	whether to show seconds
	 * @param	string	format: us or euro
	 * @return	string
	 */
	function unix_to_human($time = '', $seconds = FALSE, $fmt = 'us')
	{
		$r = date('Y', $time).'-'.date('m', $time).'-'.date('d', $time).' ';

		if ($fmt === 'us')
		{
			$r .= date('h', $time).':'.date('i', $time);
		}
		else
		{
			$r .= date('H', $time).':'.date('i', $time);
		}

		if ($seconds)
		{
			$r .= ':'.date('s', $time);
		}

		if ($fmt === 'us')
		{
			return $r.' '.date('A', $time);
		}

		return $r;
	}
}

// ------------------------------------------------------------------------

if ( ! function_exists('human_to_unix'))
{
	/**
	 * Convert "human" date to GMT
	 *
	 * Reverses the above process
	 *
	 * @param	string	format: us or euro
	 * @return	int
	 */
	function human_to_unix($datestr = '')
	{
		if ($datestr === '')
		{
			return FALSE;
		}

		$datestr = preg_replace('/\040+/', ' ', trim($datestr));

		if ( ! preg_match('/^(\d{2}|\d{4})\-[0-9]{1,2}\-[0-9]{1,2}\s[0-9]{1,2}:[0-9]{1,2}(?::[0-9]{1,2})?(?:\s[AP]M)?$/i', $datestr))
		{
			return FALSE;
		}

		sscanf($datestr, '%d-%d-%d %s %s', $year, $month, $day, $time, $ampm);
		sscanf($time, '%d:%d:%d', $hour, $min, $sec);
		isset($sec) OR $sec = 0;

		if (isset($ampm))
		{
			$ampm = strtolower($ampm);

			if ($ampm[0] === 'p' && $hour < 12)
			{
				$hour += 12;
			}
			elseif ($ampm[0] === 'a' && $hour === 12)
			{
				$hour = 0;
			}
		}

		return mktime($hour, $min, $sec, $month, $day, $year);
	}
}

// ------------------------------------------------------------------------

if ( ! function_exists('nice_date'))
{
	/**
	 * Turns many "reasonably-date-like" strings into something
	 * that is actually useful. This only works for dates after unix epoch.
	 *
	 * @param	string	The terribly formatted date-like string
	 * @param	string	Date format to return (same as php date function)
	 * @return	string
	 */
	function nice_date($bad_date = '', $format = FALSE)
	{
		if (empty($bad_date))
		{
			return 'Unknown';
		}
		elseif (empty($format))
		{
			$format = 'U';
		}

		// Date like: YYYYMM
		if (preg_match('/^\d{6}$/i', $bad_date))
		{
			if (in_array(substr($bad_date, 0, 2), array('19', '20')))
			{
				$year  = substr($bad_date, 0, 4);
				$month = substr($bad_date, 4, 2);
			}
			else
			{
				$month  = substr($bad_date, 0, 2);
				$year   = substr($bad_date, 2, 4);
			}

			return date($format, strtotime($year.'-'.$month.'-01'));
		}

		// Date Like: YYYYMMDD
		if (preg_match('/^(\d{2})\d{2}(\d{4})$/i', $bad_date, $matches))
		{
			return date($format, strtotime($matches[1].'/01/'.$matches[2]));
		}

		// Date Like: MM-DD-YYYY __or__ M-D-YYYY (or anything in between)
		if (preg_match('/^(\d{1,2})-(\d{1,2})-(\d{4})$/i', $bad_date, $matches))
		{
			return date($format, strtotime($matches[3].'-'.$matches[1].'-'.$matches[2]));
		}

		// Any other kind of string, when converted into UNIX time,
		// produces "0 seconds after epoc..." is probably bad...
		// return "Invalid Date".
		if (date('U', strtotime($bad_date)) === '0')
		{
			return 'Invalid Date';
		}

		// It's probably a valid-ish date format already
		return date($format, strtotime($bad_date));
	}
}

// ------------------------------------------------------------------------

if ( ! function_exists('timezone_menu'))
{
	/**
	 * Timezone Menu
	 *
	 * Generates a drop-down menu of timezones.
	 *
	 * @param	string	timezone
	 * @param	string	classname
	 * @param	string	menu name
	 * @param	mixed	attributes
	 * @return	string
	 */
	function timezone_menu($default = 'UTC', $class = '', $name = 'timezones', $attributes = '')
	{
		$CI =& get_instance();
		$CI->lang->load('date');

		$default = ($default === 'GMT') ? 'UTC' : $default;

		$menu = '<select name="'.$name.'"';

		if ($class !== '')
		{
			$menu .= ' class="'.$class.'"';
		}

		$menu .= _stringify_attributes($attributes).">\n";

		foreach (timezones() as $key => $val)
		{
			$selected = ($default === $key) ? ' selected="selected"' : '';
			$menu .= '<option value="'.$key.'"'.$selected.'>'.$CI->lang->line($key)."</option>\n";
		}

		return $menu.'</select>';
	}
}

// ------------------------------------------------------------------------

if ( ! function_exists('timezones'))
{
	/**
	 * Timezones
	 *
	 * Returns an array of timezones. This is a helper function
	 * for various other ones in this library
	 *
	 * @param	string	timezone
	 * @return	string
	 */
	function timezones($tz = '')
	{
		// Note: Don't change the order of these even though
		// some items appear to be in the wrong order

		$zones = array(
			'UM12'		=> -12,
			'UM11'		=> -11,
			'UM10'		=> -10,
			'UM95'		=> -9.5,
			'UM9'		=> -9,
			'UM8'		=> -8,
			'UM7'		=> -7,
			'UM6'		=> -6,
			'UM5'		=> -5,
			'UM45'		=> -4.5,
			'UM4'		=> -4,
			'UM35'		=> -3.5,
			'UM3'		=> -3,
			'UM2'		=> -2,
			'UM1'		=> -1,
			'UTC'		=> 0,
			'UP1'		=> +1,
			'UP2'		=> +2,
			'UP3'		=> +3,
			'UP35'		=> +3.5,
			'UP4'		=> +4,
			'UP45'		=> +4.5,
			'UP5'		=> +5,
			'UP55'		=> +5.5,
			'UP575'		=> +5.75,
			'UP6'		=> +6,
			'UP65'		=> +6.5,
			'UP7'		=> +7,
			'UP8'		=> +8,
			'UP875'		=> +8.75,
			'UP9'		=> +9,
			'UP95'		=> +9.5,
			'UP10'		=> +10,
			'UP105'		=> +10.5,
			'UP11'		=> +11,
			'UP115'		=> +11.5,
			'UP12'		=> +12,
			'UP1275'	=> +12.75,
			'UP13'		=> +13,
			'UP14'		=> +14
		);

		if ($tz === '')
		{
			return $zones;
		}

		return isset($zones[$tz]) ? $zones[$tz] : 0;
	}
}

// ------------------------------------------------------------------------

if ( ! function_exists('date_range'))
{
	/**
	 * Date range
	 *
	 * Returns a list of dates within a specified period.
	 *
	 * @param	int	unix_start	UNIX timestamp of period start date
	 * @param	int	unix_end|days	UNIX timestamp of period end date
	 *					or interval in days.
	 * @param	mixed	is_unix		Specifies whether the second parameter
	 *					is a UNIX timestamp or a day interval
	 *					 - TRUE or 'unix' for a timestamp
	 *					 - FALSE or 'days' for an interval
	 * @param	string  date_format	Output date format, same as in date()
	 * @return	array
	 */
	function date_range($unix_start = '', $mixed = '', $is_unix = TRUE, $format = 'Y-m-d')
	{
		if ($unix_start == '' OR $mixed == '' OR $format == '')
		{
			return FALSE;
		}

		$is_unix = ! ( ! $is_unix OR $is_unix === 'days');

		// Validate input and try strtotime() on invalid timestamps/intervals, just in case
		if ( ( ! ctype_digit((string) $unix_start) && ($unix_start = @strtotime($unix_start)) === FALSE)
			OR ( ! ctype_digit((string) $mixed) && ($is_unix === FALSE OR ($mixed = @strtotime($mixed)) === FALSE))
			OR ($is_unix === TRUE && $mixed < $unix_start))
		{
			return FALSE;
		}

		if ($is_unix && ($unix_start == $mixed OR date($format, $unix_start) === date($format, $mixed)))
		{
			return array(date($format, $unix_start));
		}

		$range = array();

		/* NOTE: Even though the DateTime object has many useful features, it appears that
		 *	 it doesn't always handle properly timezones, when timestamps are passed
		 *	 directly to its constructor. Neither of the following gave proper results:
		 *
		 *		new DateTime('<timestamp>')
		 *		new DateTime('<timestamp>', '<timezone>')
		 *
		 *	 --- available in PHP 5.3:
		 *
		 *		DateTime::createFromFormat('<format>', '<timestamp>')
		 *		DateTime::createFromFormat('<format>', '<timestamp>', '<timezone')
		 *
		 *	 ... so we'll have to set the timestamp after the object is instantiated.
		 *	 Furthermore, in PHP 5.3 we can use DateTime::setTimestamp() to do that and
		 *	 given that we have UNIX timestamps - we should use it.
		*/
		$from = new DateTime();

		if (is_php('5.3'))
		{
			$from->setTimestamp($unix_start);
			if ($is_unix)
			{
				$arg = new DateTime();
				$arg->setTimestamp($mixed);
			}
			else
			{
				$arg = (int) $mixed;
			}

			$period = new DatePeriod($from, new DateInterval('P1D'), $arg);
			foreach ($period as $date)
			{
				$range[] = $date->format($format);
			}

			/* If a period end date was passed to the DatePeriod constructor, it might not
			 * be in our results. Not sure if this is a bug or it's just possible because
			 * the end date might actually be less than 24 hours away from the previously
			 * generated DateTime object, but either way - we have to append it manually.
			 */
			if ( ! is_int($arg) && $range[count($range) - 1] !== $arg->format($format))
			{
				$range[] = $arg->format($format);
			}

			return $range;
		}

		$from->setDate(date('Y', $unix_start), date('n', $unix_start), date('j', $unix_start));
		$from->setTime(date('G', $unix_start), date('i', $unix_start), date('s', $unix_start));
		if ($is_unix)
		{
			$arg = new DateTime();
			$arg->setDate(date('Y', $mixed), date('n', $mixed), date('j', $mixed));
			$arg->setTime(date('G', $mixed), date('i', $mixed), date('s', $mixed));
		}
		else
		{
			$arg = (int) $mixed;
		}
		$range[] = $from->format($format);

		if (is_int($arg)) // Day intervals
		{
			do
			{
				$from->modify('+1 day');
				$range[] = $from->format($format);
			}
			while (--$arg > 0);
		}
		else // end date UNIX timestamp
		{
			for ($from->modify('+1 day'), $end_check = $arg->format('Ymd'); $from->format('Ymd') < $end_check; $from->modify('+1 day'))
			{
				$range[] = $from->format($format);
			}

			// Our loop only appended dates prior to our end date
			$range[] = $arg->format($format);
		}

		return $range;
	}
}