Detailed introduction to several methods of converting PHP time to timestamp

PHP time to timestamp is a common operation, which can convert the specified time into a timestamp in seconds. In PHP projects, timestamp is a very important concept. It can be used to handle time-related operations, such as logging, counting duration, etc. In this article, we will introduce several ways to convert PHP time to timestamp.

1. Use the date() function to convert PHP time to timestamp

The date() function is a function used to format dates and times in PHP. The first parameter of this function is Format string, the second parameter is an optional timestamp. When converting timestamps, we simply set the first parameter to "U".

The sample code is as follows:

$timestamp = date("U"); //获取当前时间戳
echo "时间戳为：" . $timestamp;

2. Use the strtotime() function to convert PHP time to timestamp

The strtotime() function is used in PHP to convert date and time characters A function that converts a string to a timestamp. It accepts a date format string as a parameter. This function accepts any time format from 1970-01-01 00:00:00 to the current time.

The sample code is as follows:

$datetime = '2021-09-03 10:46:20';
$timestamp = strtotime($datetime);
echo "时间戳为：" . $timestamp;

3. Use the DateTime class to convert PHP time to timestamp

The DateTime class in PHP is a powerful class that provides many dates and time processing methods. Using this class, we can easily convert date and time into timestamp.

The sample code is as follows:

$date = new DateTime('2021-09-03 10:46:20');
$timestamp = $date->getTimestamp();
echo "时间戳为：" . $timestamp;

4. Use the mktime() function to convert PHP time to timestamp

The mktime() function is a function in PHP that creates a UNIX timestamp. , which accepts a parameter list containing date and time information and returns the corresponding timestamp. This function can also be used to convert date and time strings into timestamps.

The sample code is as follows:

$timestamp = mktime(10, 46, 20, 9, 3, 2021);
echo "时间戳为：" . $timestamp;

Note: The above methods are all operated in the default time zone. If you need to specify the time zone, you can set it through the date_default_timezone_set() function.

Summary:

In PHP projects, timestamp is a very important concept. This article mainly introduces several methods of converting PHP time to timestamp, including using the date() function, strtotime() function, DateTime class and mktime() function. Readers can choose the appropriate method according to their own needs. At the same time, you need to pay attention to setting the correct time zone to ensure the accuracy of the results.

The above is the detailed content of Detailed introduction to several methods of converting PHP time to timestamp. For more information, please follow other related articles on the PHP Chinese website!