How to get the current date in php and calculate the day it is

PHP is a scripting language for developing websites. It is one of the most popular programming languages ​​at present. Many websites are implemented in PHP language. In practical applications, we often need to get the current date and see what day of the year the current date is. So, how to implement this function with PHP? This article will discuss how to get the current date through PHP and calculate the day of the year today is.

1. Get the current date

There are many ways to get the current date in PHP. The more commonly used one is to use the PHP built-in function date(). The format of this function is as follows:

date ( string $format [, int $timestamp = time() ] ) : string

Where format is the date format, such as "Y-m-d H:i:s", the format can be customized as needed. Timestamp is the timestamp, which represents the timestamp corresponding to the date to be obtained. It is an optional parameter. If not specified, it defaults to the timestamp of the current time.

For example, to get the current date and time, you can use the following code:

<?php     echo date(&#39;Y-m-d H:i:s&#39;); //输出类似"2022-02-21 12:43:20"的当前日期和时间
?>

2. Calculate the day of the year

With the current date, next You can calculate what day of the year today is. The main idea is to calculate the number of days from January 1st of this year based on the current date, and then you can get the day of the year today. The specific implementation is as follows:

<?php     $now = time(); //获取当前时间戳
    $start = strtotime(date(&#39;Y-m-d&#39;,$now).&#39; 00:00:00&#39;); //获取当年的第一天的时间戳
    $diff = $now - $start; //计算时间差
    $day = ceil($diff / 86400) + 1; //计算相差多少天并加1，即为今年的第几天
    echo &#39;今天是本年度的第&#39;.$day.&#39;天&#39;; //输出
?>

In the above code, we first obtain The current timestamp $now, and then use the date() function to get the timestamp $start of the first day of the year, calculate the time difference $diff and convert it into the number of days, and then add 1 to the number of days to get the day of the year$ day, just output it at the end.

3. Summary

The above is the process of obtaining the current date and calculating the day of the year today through PHP. PHP provides many date and time processing functions, and you can choose different functions to implement different functions according to your needs. Mastering these skills can greatly facilitate the operation of date and time and improve development efficiency.

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