如何获取正确的PHP Timestamp值？代码无法返回目标格式求助

Hey there! Let's break down what's wrong with your current code and get you that 13-digit millisecond timestamp (like 1516426272898) you're after.

What's Wrong With Your Current Code? #

The key issue is how you're using date_timestamp_get():

• This function expects a DateTime object as its parameter, but you're passing a formatted date string (the output of date("l, F \ j,Y, h:i:s A")). Since it can't parse the string into a valid timestamp source, it fails to return the value you want.

Solution 1: Use DateTime Class for Millisecond Timestamps #

If you want to work with DateTime (which is great for timezone handling and date manipulation), here's how to get the 13-digit timestamp:

date_default_timezone_set('Asia/Kolkata');
$dateTime = new DateTime();

// Calculate millisecond timestamp: seconds * 1000 + milliseconds from microseconds
$millisecondTimestamp = $dateTime->getTimestamp() * 1000 + floor($dateTime->format('u') / 1000);

echo $millisecondTimestamp;

• getTimestamp() gives you the standard 10-digit second-based timestamp.
• format('u') returns 6-digit microseconds; dividing by 1000 converts it to 3-digit milliseconds, which we add to the scaled-up second timestamp.

Solution 2: A Simpler Direct Approach #

If you don't need the full DateTime functionality, you can use microtime(true) to get a float-based timestamp (including microseconds) and convert it directly:

date_default_timezone_set('Asia/Kolkata');
$microtime = microtime(true);

// Multiply by 1000 and cast to integer to get 13-digit milliseconds
$millisecondTimestamp = (int)($microtime * 1000);

echo $millisecondTimestamp;

This works because microtime(true) returns the current time as a float (e.g., 1705321234.5678), where the decimal part represents microseconds. Multiplying by 1000 shifts the decimal to get milliseconds, and casting to int trims off any extra precision.

Bonus: If You Need a Timestamp From a Specific Formatted Date #

If your end goal is to generate a millisecond timestamp from a pre-existing formatted date string (not the current time), you can parse the string into a DateTime object first:

date_default_timezone_set('Asia/Kolkata');
$dateStr = "Monday, January 15, 2024, 03:45:10 PM";

// Parse the string into a DateTime object using the same format you used to generate it
$dateTime = DateTime::createFromFormat("l, F j,Y, h:i:s A", $dateStr);

// Convert to millisecond timestamp (note: no millisecond data in the original string, so we append 0s)
$millisecondTimestamp = $dateTime->getTimestamp() * 1000;

echo $millisecondTimestamp;

内容的提问来源于stack exchange，提问作者Game Mod Apk