How to convert date to days in php

php method to convert date to number of days: 1. strtotime() function, use this function to convert the date to UNIX timestamp, use the "floor()" function to divide by the number of seconds per day to get the date Number of days; 2. DateTime class, create a DateTime object, use the "diff()" method to compare the given date with the current date, and then use the "format()" method to get the number of days between dates; 3. Write a custom function to Convert dates to days and more.

The operating environment of this article: Windows 10 system, php8.1.3 version, dell g3 computer.

PHP is a widely used programming language and many projects and applications use PHP to handle dates and times. In some cases, we may need to convert the date to the corresponding number of days. This article will introduce some common PHP methods to help you convert dates to days.

1. Use the strtotime() function:

The strtotime() function is one of the commonly used functions in PHP to handle dates and times. It converts a string to a UNIX timestamp, the number of seconds since January 1, 1970. Here is an example of converting a date to a number of days:

$date = "2022-10-31";
$timestamp = strtotime($date);
$days = floor($timestamp / (60 * 60 * 24));
echo "日期：".$date."<br>";
echo "天数：".$days;

In the above example, we first convert the date ("2022-10-31") to a UNIX timestamp using the strtotime() function. We then use the floor() function to divide it by the number of seconds per day (60 * 60 * 24) to get the number of days in the date.

2. Use the DateTime class:

The DateTime class in PHP provides an object-oriented method for processing dates and times. It has many useful methods and properties that simplify working with dates and times. The following is an example of converting a date to a number of days using the DateTime class:

$date = "2022-10-31";
$datetime = new DateTime($date);
$now = new DateTime();
$interval = $datetime->diff($now);
$days = $interval->format('%a');
echo "日期：".$date."<br>";
echo "天数：".$days;

In the above example, we first create a DateTime object to represent the given date. We then use the diff() method to compare the given date with the current date, returning a DateInterval object. Next, we use the format() method to get the number of days between dates.

3. Use custom functions:

In addition to using the built-in PHP functions and DateTime class, we can also write custom functions to convert dates to days . The following is an example of a custom function:

function getDaysFromDate($date) {
$date_parts = explode("-", $date);
$year = $date_parts[0];
$month = $date_parts[1];
$day = $date_parts[2];
$days = 0;
for ($i = 1970; $i < $year; $i++) {
if ($i % 4 == 0 && ($i % 100 != 0 || $i % 400 == 0)) {
$days += 366;
} else {
$days += 365;
}
}
$days += date("z", mktime(0, 0, 0, $month, $day, $year)) + 1;
return $days;
}
$date = "2022-10-31";
$days = getDaysFromDate($date);
echo "日期：".$date."<br>";
echo "天数：".$days;

In the above example, we first split the date string into year, month, and day parts through the explode() function. Then, use a loop to calculate the total number of days since 1970. Finally, use the mktime() function to get the number of days in a year for a given date and add it to the total number of days calculated previously.

The above are some common PHP methods that can help you convert dates into days. Choose the method that suits your project needs, and adjust and improve accordingly as needed.

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