DateInterval::createFromDateString

    (PHP 5 >= 5.3.0, PHP 7, PHP 8)

    DateInterval::createFromDateString — Sets up a DateInterval from the relative parts of the string

    说明

    面向对象风格

    publicstaticDateInterval::createFromDateString(string$datetime): DateInterval|false

    过程化风格

    date_interval_create_from_date_string(string$datetime): DateInterval|false

    Uses the date/time parsers as used in the DateTimeImmutable constructor to create a DateInterval from the relative parts of the parsed string.

    参数

    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.

    返回值

    Returns a new DateInterval instance on success, 或者在失败时返回 false.

    更新日志

    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

    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：


    449 2 70
    1 -10

    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) }
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