Summarize the method of converting date to integer in php

PHP is an open source server-side scripting language that is widely used in the field of web development. In PHP development, date processing is a common requirement. In many cases, we need to convert date strings into integer data for calculation and storage. This article will introduce how to convert dates to integers in PHP.

1. strtotime function

The strtotime function in PHP can convert a date string into a Unix timestamp. The Unix timestamp is an integer that represents the number of seconds from 0:00:00 on January 1, 1970 to the current time. Therefore, use the strtotime function to convert a date string into integer data.

The specific usage is as follows:

$timestamp = strtotime($datestr);

Among them, $datestr is the date string that needs to be converted. $timestamp is the converted Unix timestamp.

For example, if you need to convert the date string "2020-01-01" into integer data, you can use the following code:

$timestamp = strtotime("2020-01-01");

2. mktime function

The mktime function in PHP can return a Unix timestamp based on the given date and time parameters. The specific usage is as follows:

$timestamp = mktime($hour, $minute, $second, $month, $day, $year);

Among them, $hour, $minute and $second represent hours, minutes and seconds. $month, $day and $year represent month, day and year. $timestamp is the returned Unix timestamp.

For example, if you need to convert the date "2020-01-01 12:00:00" into integer data, you can use the following code:

$timestamp = mktime(12, 0, 0, 1, 1, 2020);

3. DateTime Class

The DateTime class in PHP provides encapsulation and operation methods for date objects. You can use the DateTime class to convert a date string to a DateTime object and get the Unix timestamp using the getTimeStamp method.

The specific usage is as follows:

$datetime = new DateTime($datestr);
$timestamp = $datetime->getTimestamp();

Among them, $datestr is the date string that needs to be converted. $datetime is the converted DateTime object. $timestamp is the Unix timestamp corresponding to the DateTime object.

For example, if you need to convert the date string "2020-01-01 12:00:00" into integer data, you can use the following code:

$datetime = new DateTime("2020-01-01 12:00:00");
$timestamp = $datetime->getTimestamp();

4. strtotime and date Combination use

In addition to the above three methods, you can also use strtotime and date combined calls to convert date strings into integer data. The specific usage is as follows:

$timestamp = date("U", strtotime($datestr));

Among them, $datestr is the date string that needs to be converted. The "U" parameter in the date function means returning a Unix timestamp.

For example, if you need to convert the date string "2020-01-01" into integer data, you can use the following code:

$timestamp = date("U", strtotime("2020-01-01"));

The above are several ways to convert dates to integers in PHP method. In actual development, the most appropriate method should be selected based on specific needs. At the same time, since factors such as time zone may affect the conversion results, it is recommended that you pay attention to relevant details when using it.

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