How to convert millisecond timestamp to seconds timestamp in php

With the rapid development of Internet technology, more and more application scenarios require the use of timestamps. In the PHP language, we often use timestamps to represent time. However, sometimes we need to convert millisecond timestamps into second-level timestamps, which requires us to master some relevant knowledge. This article will introduce how to convert millisecond timestamp to second timestamp in PHP language.

1. What is a timestamp?

A timestamp is a way for computers to process dates and times. It usually represents the time since 0:00 on January 1, 1970. The number of seconds since 0 minutes and 0 seconds (midnight UTC/GMT). Timestamps represent dates and times in a language-independent way. In the PHP language, the timestamp can be obtained by using the time() function to obtain the second-level timestamp of the current time.

2. What is a millisecond timestamp?

The millisecond timestamp is more precise than the second timestamp. It represents the time from 0:00 on January 1, 1970 The number of milliseconds since 0 minutes and 0 seconds. Millisecond timestamps are often used to measure time intervals and ensure data uniqueness in high-concurrency scenarios.

3. Convert millisecond timestamp to second timestamp

In PHP language, to convert millisecond timestamp to second-level timestamp, you need to use date( ) function combined with the substr() function for conversion. The date() function will format the timestamp into a string of date and time, and the substr() function can intercept a string of specified length. The following is the code for the specific implementation:

function millisToSeconds($millis) {
    return substr($millis, 0, -3);
}

Using this function, we can convert the millisecond timestamp into the corresponding second-level timestamp, for example:

$millis = 1629901938234;
$seconds = millisToSeconds($millis); // 结果是 1629901938

In this way, we can easily Millisecond timestamps are converted into second-level timestamps.

4. Notes

There are several things to note when using millisecond timestamps:

1. In PHP, time Stamps are usually measured in seconds, so to avoid loss of precision we usually convert millisecond timestamps to floating point numbers for processing.
2. In high concurrency scenarios, millisecond timestamps may be repeated. Therefore, before data storage, it is necessary to determine whether the same millisecond timestamp exists and handle it accordingly, for example, by adding a random number or other means to ensure the uniqueness of the data.
3. The use of timestamps requires attention to time zone issues. Therefore, it is recommended to convert the millisecond timestamp into the corresponding date and time according to the specific situation, and then perform the time zone conversion.

5. Summary

This article introduces how to convert millisecond timestamps into second-level timestamps in PHP language, and also explains how to use milliseconds Things to note when timestamping. I hope it can be helpful to everyone in using timestamps in practice.

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