How to convert today's time to timestamp in php

PHP's timestamp is a time representation that represents the number of seconds from January 1, 1970 00:00:00 (Greenwich Mean Time) to the current time. In PHP, sometimes you need to convert the current time into a timestamp for processing. This article will introduce how to convert today's time into a timestamp in PHP.

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

In PHP, use the time() function to obtain the current timestamp, for example:

$timestamp = time();
echo $timestamp;

This code The current timestamp will be output, and the result may be similar to:

1550394377

This value represents the number of seconds from 00:00:00 on January 1, 1970 to the present.

2. Use the strtotime() function to convert today’s date string into a timestamp

In PHP, you can use the strtotime() function to convert a date string into a timestamp. For example, the following code will get today's date string and convert it into a timestamp:

$date = date('Y-m-d');
$timestamp = strtotime($date);
echo $timestamp;

This code can output the timestamp of today's time, and the result may be similar to:

1550409600

This value also represents the number of seconds from 00:00:00 on January 1, 1970 to the present, except that the number of seconds here represents the early morning of today, that is, the starting time of today.

3. Use the mktime() function to convert today's time into a timestamp

In PHP, you can use the mktime() function to generate a timestamp. If the parameters passed in are insufficient, the current time will be used to automatically complete them. For example, the following code will obtain today's hour, minute, and second, as well as the current year, month, and day, and convert it into a timestamp:

$hour = 0;
$minute = 0;
$second = 0;

$today = date('Y-m-d');
list($year, $month, $day) = explode('-', $today);

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

The output result of this code is similar to the previous code, and it is also the time of today. stamp. The parameters of the mktime() function are hours, minutes, seconds, months, days, and years.

Summary:

This article introduces three methods to convert today's time into a timestamp in PHP, namely using the time() function, using the strtotime() function and using mktime() function. Different methods can be chosen according to different needs. Timestamp is a very convenient way to express time and is very commonly used in PHP.

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