How to convert time to milliseconds in php

Today I will share with you tips on converting PHP time into milliseconds.

In daily development work, we often need to convert time into milliseconds. This process seems very simple, but once you master the simple skills, it will greatly improve your development efficiency.

First, let us understand the related functions of date and time in PHP. There are many functions in PHP that handle date and time, such as date(), time(), strtotime(), etc. Among them, the date() function can convert the specified date and time format into a string format, while time() can obtain the timestamp of the current time, and strtotime() can convert the string date into a timestamp. These functions are widely used in PHP, but they all return a timestamp in seconds.

So the question is, how to convert a date and time into milliseconds? The answer is also simple: in PHP, we just need to use microsecond-level timestamps. Each microsecond is equal to one thousandth of a millisecond, which is 1,000 when converted into numbers.

Microsecond-level timestamps can be obtained by adding microtime() before the time() function. For example, the following code can obtain the microsecond level timestamp of the current time:

list($usec, $sec) = explode(" ", microtime());
$time = ((float)$usec + (float)$sec) * 1000;

In this code snippet, we use the list() function and explode() function to split the value returned by microtime() Divide into two parts. $usec will contain the fractional part of the microsecond timestamp, while $sec contains the integer part. Then, we add $usec and $sec and multiply the result by 1000 to get the millisecond-level timestamp we want.

Of course, if you only need to convert the timestamp into milliseconds, you can also use the following code:

$msec = round(microtime(true) * 1000);

In this code snippet, we use the microtime(true) function to get the current microsecond level timestamp of the time, then multiply it by 1000 and use the round() function to round the result to the nearest integer.

Using this method to convert timestamps to milliseconds is very simple and very efficient. This technique is often used in development because most frameworks and libraries need to specify times in milliseconds. Now that you've learned how to convert time to milliseconds using PHP, let's get started speeding up your development!

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