php 中当前月份的第一天，使用 date_modify 作为 DateTime 对象 [英] The first day of the current month in php using date_modify as DateTime object

问题描述

我可以通过以下方式获得本周的星期一:

I can get the Monday of this week with:

$monday = date_create()->modify('this Monday');

我希望在本月 1 日也能轻松度过.我怎样才能做到这一点?

I would like to get with the same ease the 1st of this month. How can I achieve that?

推荐答案

需要 PHP 5.3 才能工作(PHP 5.3 中引入了first day of").否则上面的例子是唯一的方法:

Requires PHP 5.3 to work ("first day of" is introduced in PHP 5.3). Otherwise the example above is the only way to do it:

<?php
    // First day of this month
    $d = new DateTime('first day of this month');
    echo $d->format('jS, F Y');

    // First day of a specific month
    $d = new DateTime('2010-01-19');
    $d->modify('first day of this month');
    echo $d->format('jS, F Y');

    // alternatively...
    echo date_create('2010-01-19')
      ->modify('first day of this month')
      ->format('jS, F Y');

在 PHP 5.4+ 中你可以这样做:

In PHP 5.4+ you can do this:

<?php
    // First day of this month
    echo (new DateTime('first day of this month'))->format('jS, F Y');

    echo (new DateTime('2010-01-19'))
      ->modify('first day of this month')
      ->format('jS, F Y');

如果您更喜欢简洁的方式来执行此操作，并且已经将年份和月份设为数值，则可以使用 date():

If you prefer a concise way to do this, and already have the year and month in numerical values, you can use date():

<?php
    echo date('Y-m-01'); // first day of this month
    echo date("$year-$month-01"); // first day of a month chosen by you

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