How to output timestamp in php

As one of the most commonly used server-side programming languages, PHP can be used for the development of various web applications, in which timestamp is a frequently used data type. In PHP, a timestamp is the number of seconds from January 1, 1970 00:00:00 GMT (Greenwich Mean Time) to a specified time. Therefore, outputting timestamps is a very important operation in PHP programming. In this article, we will explore how to output timestamps using PHP.

1. Use the time() function to output the current timestamp

You can use the time() function in PHP to obtain the current timestamp. This function does not require any parameters and can be called directly. Can. The following is a simple example code:

echo time();

The above code will output a result similar to the following:

1618254801

The result is the current timestamp, representing 00:00 on January 1, 1970: 00 GMT The number of seconds to the current time.

2. Use the strtotime() function to output the specified timestamp

You can use the strtotime() function in PHP to convert a string time into a timestamp. This function requires one parameter, which is the time string that needs to be converted. The string can be a date time in any format, such as "now", "today", "1 day", etc. The following is a sample code:

echo strtotime("2021-04-13 12:00:00");

The above code will output a result similar to the following:

1618300800

The result is a timestamp of the specified time, representing 00:00 on January 1, 1970: 00 GMT The number of seconds to the specified time.

3. Use the date() function to format the timestamp

You can use the date() function in PHP to format the timestamp into any required date format. This function has two parameters. The first parameter is the date and time format that needs to be formatted. It can be any date and time format, such as "Y-m-d H:i:s", "Y year m month d day H hour i minute s second "And so on; the second parameter is the timestamp that needs to be formatted. The following is a simple sample code:

echo date("Y-m-d H:i:s", time());

The above code will output a string formatted at the current time, similar to the following result:

2021-04-13 09:00:01

The result is a string formatted at the current time.

4. Use the gmdate() function to output UTC timestamp

You can use the gmdate() function in PHP to convert the timestamp to UTC time. This function is similar to the date() function, but converts the time to a date and time in the UTC time zone. The following is a sample code:

echo gmdate('Y-m-d H:i:s', time());

The above code will output a string formatted by UTC time, similar to the following result:

2021-04-13 01:00:01

The result is a string formatted by the current UTC time.

Summary

Through the above four methods, we can use PHP to output timestamps. The time() function can output the current timestamp, the strtotime() function can convert a string time into a timestamp, the date() function can format the timestamp into any required date format, and the gmdate() function can output a UTC timestamp. . When developing web applications, timestamps are a commonly used data type. Knowing how to output timestamps can help us better develop PHP applications.

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