How to convert time to timestamp in PHP? Multiple implementation methods

In PHP, it is often involved in converting time. One of the common operations is to convert time into a timestamp. So, how to convert time into timestamp in PHP? This article will introduce you to the specific implementation method.

1. The definition of timestamp

In PHP, the timestamp refers to the number of seconds that have elapsed since 0:00:00 on January 1, 1970 to the current time. Through timestamps, we can compare and calculate time, and we can also convert time into other formats to facilitate our data processing.

2. Convert time into timestamp

To convert time into timestamp, in PHP, we can use the time() function and strtotime() function.

1. time() function

The time() function is a built-in function in PHP, used to obtain the timestamp of the current time. We can call this function directly to get the current timestamp.

For example:

echo time();

The above code output is the current timestamp.

2. strtotime() function

strtotime() function is used to convert date and time strings into timestamps. Its basic syntax is as follows:

strtotime(time_string, [now])

Among them, time_string is the date and time string that needs to be converted; now is an optional parameter, indicating the time from which to start calculation. When the now parameter is not specified, the default is the current time.

For example:

echo strtotime('2020-10-01 12:00:00');

The above code output is the timestamp of 12 o'clock on October 1, 2020.

3. Calculation of timestamps

Through timestamps, we can easily calculate time. For example, we can calculate the difference between two times from a timestamp, and we can add or subtract a time value from a timestamp.

1. Calculate the difference between two times

To calculate the difference between two times, we can first convert both times into timestamps , and then subtract the smaller timestamp from the larger timestamp to get the time difference in seconds. For example:

$time1 = strtotime('2020-09-01 00:00:00');
$time2 = strtotime('2020-10-01 00:00:00');
$diff = $time2 - $time1;
echo $diff;

The output of the above code is 2592000, that is, the difference between September 1, 2020 and October 1, 2020 is 2592000 seconds.

2. Time stamp addition and subtraction

To add and subtract timestamps, you can use PHP’s built-in timestamp function, for example:

$time = time();
// 将时间戳加上1天
$new_time = $time + 24 * 60 * 60;
echo $new_time;

above The code adds 1 day to the current time and outputs the new timestamp.

4. Summary

Through the introduction of this article, we have learned about the method of converting time into timestamp in PHP, as well as the calculation operation of timestamp. In actual development, timestamps are a very important concept. Mastering the use of timestamps can enable us to perform time calculations more efficiently.

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