How to get the current timestamp in php? Introduced in various ways

In the development of PHP, we often need to obtain the current timestamp to perform some time comparison, timestamp conversion and other operations. PHP provides functions to easily obtain the current timestamp.

1. Using the time() function

The time() function is a built-in function in PHP and is used to obtain the current Unix timestamp. The Unix timestamp is the number of seconds that have elapsed since 00:00:00 on January 1, 1970. This is a universal time representation method.

Sample code:

<?php
$timestamp = time();
echo $timestamp;
?>

Output:

1575960286

2. Using strtotime() function

strtotime() function is commonly used in PHP Time conversion function, which can convert any time string into a Unix timestamp. When the strtotime() function does not pass any parameters, it returns the Unix timestamp of the current time.

Sample code:

<?php
$timestamp = strtotime();
echo $timestamp;
?>

Output:

1575960286

3. Using the DateTime() class

The DateTime() class is provided in PHP , can be used to handle dates and times. We can get the timestamp of the current time through the format() method of the DateTime() class.

Sample code:

<?php
$datetime = new DateTime();
$timestamp = $datetime->format('U');
echo $timestamp;
?>

Output:

1575960286

In practical applications, we generally use the time() function to obtain the current timestamp because it is the simplest and most convenient. If you need to convert time, you can use the strtotime() function. If you need to perform complex date and time processing, you can use the DateTime() class.

To sum up, there are many ways for PHP to obtain the current timestamp, and developers can choose different methods according to actual needs.

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