DateInterval::createFromDateString ( string $time )
When the manual says "Uses the normal date parsers" it means that this function cannot take $time = ISO8601 strings like "P7D". If you want to use those, you must use the constructor.
(PHP 5 >= 5.3.0, PHP 7, PHP 8)
DateInterval::createFromDateString — Sets up a DateInterval from the relative parts of the string
面向对象风格
过程化风格
Uses the date/time parsers as used in the DateTimeImmutable constructor to create a DateInterval from the relative parts of the parsed string.
datetime
A date with relative parts. Specifically, the relative formats supported by the parser used for DateTimeImmutable, DateTime, and strtotime() will be used to construct the DateInterval.
To use an ISO-8601 format string like P7D
, you must
use the constructor.
Returns a new DateInterval instance on success, 或者在失败时返回 false
.
版本 | 说明 |
---|---|
8.2.0 |
Only the from_string and
date_string properties will be visible when a
DateInterval is created with this method.
|
示例 #1 Parsing valid date intervals
<?php
// Each set of intervals is equal.
$i = new DateInterval('P1D');
$i = DateInterval::createFromDateString('1 day');
$i = new DateInterval('P2W');
$i = DateInterval::createFromDateString('2 weeks');
$i = new DateInterval('P3M');
$i = DateInterval::createFromDateString('3 months');
$i = new DateInterval('P4Y');
$i = DateInterval::createFromDateString('4 years');
$i = new DateInterval('P1Y1D');
$i = DateInterval::createFromDateString('1 year + 1 day');
$i = new DateInterval('P1DT12H');
$i = DateInterval::createFromDateString('1 day + 12 hours');
$i = new DateInterval('PT3600S');
$i = DateInterval::createFromDateString('3600 seconds');
?>
示例 #2 Parsing combinations and negative intervals
<?php
$i = DateInterval::createFromDateString('62 weeks + 1 day + 2 weeks + 2 hours + 70 minutes');
echo $i->format('%d %h %i'), "\n";
$i = DateInterval::createFromDateString('1 year - 10 days');
echo $i->format('%y %d'), "\n";
?>
以上示例会输出:
示例 #3 Parsing special relative date intervals
<?php
$i = DateInterval::createFromDateString('last day of next month');
var_dump($i);
$i = DateInterval::createFromDateString('last weekday');
var_dump($i);
以上示例在 PHP 8.2 中的输出:
object(DateInterval)#1 (2) { ["from_string"]=> bool(true) ["date_string"]=> string(22) "last day of next month" } object(DateInterval)#2 (2) { ["from_string"]=> bool(true) ["date_string"]=> string(12) "last weekday" }
以上示例在 PHP 8 中的输出类似于:
object(DateInterval)#1 (16) { ["y"]=> int(0) ["m"]=> int(1) ["d"]=> int(0) ["h"]=> int(0) ["i"]=> int(0) ["s"]=> int(0) ["f"]=> float(0) ["weekday"]=> int(0) ["weekday_behavior"]=> int(0) ["first_last_day_of"]=> int(2) ["invert"]=> int(0) ["days"]=> bool(false) ["special_type"]=> int(0) ["special_amount"]=> int(0) ["have_weekday_relative"]=> int(0) ["have_special_relative"]=> int(0) } object(DateInterval)#2 (16) { ["y"]=> int(0) ["m"]=> int(0) ["d"]=> int(0) ["h"]=> int(0) ["i"]=> int(0) ["s"]=> int(0) ["f"]=> float(0) ["weekday"]=> int(0) ["weekday_behavior"]=> int(0) ["first_last_day_of"]=> int(0) ["invert"]=> int(0) ["days"]=> bool(false) ["special_type"]=> int(1) ["special_amount"]=> int(-1) ["have_weekday_relative"]=> int(0) ["have_special_relative"]=> int(1) }