To get the current date of the year, it can be achieved through the date() function of PHP with the format 'z'. 1. Use date('z') to directly obtain the day of the year. The return value starts from 0, so 1 is required to add to the actual number of days; 2. If you need to process a specified date, you can calculate it in combination with the strtotime() or DateTime class passing date parameters; 3. date('z') has automatically considered the impact of leap years and does not require manual adjustment; 4. It is recommended to use DateTime for object-oriented scenarios to facilitate expansion and maintenance.
There is actually a very straightforward way to get the current date of the year in PHP. PHP's date() function can be easily implemented with specific formats.
Use the date function to get the day of the year
The built-in date() function in PHP has a format parameter 'z' , which means "what day of the year" and counts from 0 (that is, January 1 is day 0).
How to use is very simple:
$day_of_year = date('z'); echo "Today is the first year's year" . ($day_of_year 1) . "day";
If you need to deal with other specified dates, you can combine strtotime() or DateTime class to operate:
$date = strtotime("2024-03-01");
$day = date('z', $date);
echo "March 1, 2024 is the first of that year" . ($day 1) . "Day";This allows you to flexibly calculate the number of days in the corresponding year of any day.
Pay attention to the effect of leap years on results
Because date('z') has automatically considered leap years, manual addition and subtraction is not required when dealing with dates like March and later.
for example:
- 2023 is not a leap year, February only has 28 days
- 2024 is a leap year, with 29 days in February
Just pass in the correct date, PHP will automatically handle these details for you without additional judgment.
If you want to use the DateTime object to write
In addition to the above method, it can also be handled in an object-oriented manner, which is clearer and easier to expand:
$date = new DateTime("2024-03-01");
$day = $date->format('z');
echo "This date is the first of the year" . ($day 1) . "day";This method is more suitable for situations where OOP styles are already used heavily in the project.
Basically these are the methods. Using date('z') is the simplest way. If you need more date operation functions, consider using DateTime . What is not complicated but easy to ignore is: Don't forget that the return value starts from 0, remember to add 1 when outputting.
The above is the detailed content of php get day number of year. For more information, please follow other related articles on the PHP Chinese website!
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