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Advanced application skills of PHP date and time functions_PHP tutorial

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Release: 2016-07-21 15:46:47
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checkdate($month,$date,$year)

如果应用的值构成一个有效日期,则该函数返回为真。例如,对于错误日期2005年2月31日,此函数返回为假。

在日期用于计算或保存在数据库中之前,可用此函数检查日期并使日期生效。

// returns false
echo checkdate(2,30,2005) ? "valid" : "invalid";
// returns true
echo checkdate(4,6,2010) ? "valid" : "invalid";
?>

getdate($ts)

在没有自变量的情况下,该函数以结合数组的方式返回当前日期与时间。数组中的每个元素代表日期/时间值中的一个特定组成部分。可向函数提交可选的时间标签自变量,以获得与时间标签对应的日期/时间值。

应用此函数来获得一系列离散的,容易分离的日期/时间值。


// get date as associative array
$arr = getdate();
echo "Date is " . $arr['mday'] . " " . $arr['weekday'] . " " . $arr['year'];
echo "Time is " . $arr['hours'] . ":" . $arr['minutes'];
?>

mktime($hour, $minute, $second, $month, $day, $year)

此函数的作用与getdate()的作用相反:它由一系列的日期与时间值生成一个UNIX时间标签(GMT时间1970年1月1日到现在消逝的秒数)。不用自变量时,它生成当前时间的UNIX时间标签。

用此函数获得即时时间的UNIX时间标签。这种时间标签通常用于许多数据库与程序语言中。


// returns timestamp for 13:15:23 7-Jun-2006
echo mktime(13,15,23,6,7,2006);
?>

date($format, $ts)

此函数将UNIX时间标签格式化成一个可人为阅读的日期字符串。它是PHP日期/时间API中功能最为强大的函数,可用在一系列的修正值中,将整数时间标签转变为所需的字符串格式。

为显示格式化时间或日期时,应用此函数。


// format current date
// returns "13-Sep-2005 01:16 PM"
echo date("d-M-Y h:i A", mktime());
?>

strtotime($str)

此函数将可人为阅读的英文日期/时间字符串转换成UNIX时间标签。

应用此函数将非标准化的日期/时间字符串转换成标准、兼容的UNIX时间标签。


// returns 13-Sep-05
echo date("d-M-y", strtotime("today"));
// returns 14-Sep-05
echo date("d-M-y", strtotime("tomorrow"));
// returns 16-Sep-05
echo date("d-M-y", strtotime("today +3 days"));
?>

strftime($format,$ts)

如前面的setlocale()函数定义的那样,此函数将UNIX时间标签格式化成适用于当前环境的日期字符串。

应用此函数建立与当前环境兼容的日期字符串。


// set locale to France (on Windows)
setlocale(LC_TIME, "fra_fra");

// format month/day names
// as per locale setting
// returns "septembre" and "mardi"

echo strftime("Month: %B ");
echo strftime("Day: %A ");
?>

microtime()

如前面的setlocale()函数定义的那样,此函数将UNIX时间标签格式化成适用于当前环境的日期字符串。

应用此函数建立与当前环境兼容的日期字符串。


// get starting value
$start = microtime();

// run some code
for ($x=0; $x<1000; $x++) {
$null = $x * $x;
}

// get ending value
$end = microtime();

// calculate time taken for code execution
echo "Elapsed time: " . ($end - $start) ." sec";
?>

gmmktime($hour, $minute, $second, $month, $day, $year)

This function is generated from a series of date and time values ​​expressed in GMT time A UNIX timestamp. When no arguments are used, it generates a UNIX time stamp of the current GMT time.

Use this function to obtain the UNIX time label of the GMT real-time time.


// returns timestamp for 12:25:23 9-Jul-2006
echo gmmktime(12,25,23,7,9,2006);
?>
// returns timestamp for 12:25:23 9-Jul-2006echo gmmktime(12,25,23,7,9,2006) ;?>


gmdate($format, $ts)


This function converts UNIX Time labels are formatted as human-readable date strings. This date string is expressed in GMT (not local time).

// format current date into GMT
// returns "13-Sep-2005 08:32 AM"
echo gmdate("d-M-Y h:i A", mktime());
?>
This function is applied when the time label is expressed in GMT.
// format current date into GMT
// returns "13-Sep-2005 08:32 AM"
echo gmdate("d-M-Y h :i A", mktime());
?>


date_default_timezone_set($tz), date_default_timezone_get()


// set timezone to UTC
date_default_timezone_set('UTC');
?>
All date/time function calls thereafter set and restore the default time zone. Note: This function is only valid in PHP 5.1+.

This function is a convenient shortcut for setting the time zone for future time operations.
// set timezone to UTCdate_default_timezone_set('UTC');?>
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http: //www.bkjia.com/PHPjc/320112.htmlTechArticlecheckdate($month,$date,$year) This function returns if the applied value constitutes a valid date is true. For example, for the error date February 31, 2005, this function returns false. On the date...
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