How to convert timestamp to human readable time format in PHP

PHP is a very popular programming language, and timestamp (Timestamp) is a very important concept used in PHP. In PHP, a timestamp is the number of seconds that represents a point in time from 0:00:00 on January 1, 1970, Greenwich Mean Time (GMT, international time). This article will explain how to convert timestamp to human-readable time format in PHP.

1. Use the date() function to convert timestamps

The built-in date() function in PHP can convert Unix timestamps into ordinary date and time formats. The specific code is as follows:

$timestamp = time(); //获取当前时间戳
$datetime = date("Y-m-d H:i:s", $timestamp); //将当前时间戳转换为日期时间格式
echo $datetime;

The output result is similar to: 2022-01-01 00:00:00.

The first parameter in the date() function is the output time format. For example, Y represents a four-digit year, m represents a two-digit month, d represents a two-digit date, and H represents two digits. The number of hours in digits, i represents the number of minutes in two digits, and s represents the number of seconds in two digits.

2. Use the DateTime class to convert timestamps

The DateTime class in PHP provides a more object-oriented way to handle dates and times. The specific code is as follows:

$timestamp = time(); //获取当前时间戳
$datetime = new DateTime();
$datetime->setTimestamp($timestamp);
echo $datetime->format('Y-m-d H:i:s');

The output result is also: 2022-01-01 00:00:00.

In the DateTime class, you can use the setTimestamp() method to set the timestamp, and the format() method can format the time into a specified style.

3. Use the strftime() function to convert timestamps

The strftime() function can convert time to localized date and time formats (different locales may have different display format). The specific code is as follows:

$timestamp = time(); //获取当前时间戳
$datetime = strftime('%Y-%m-%d %H:%M:%S', $timestamp);
echo $datetime;

In this code, %Y represents the four-digit year, %m represents the two-digit month, %d represents the two-digit date, and %H represents the two-digit month. Hours, %M represents two-digit minutes, and %S represents two-digit seconds. For details, please refer to the description of the strftime() function in the official PHP documentation.

4. Use a custom function to convert timestamps

If you need to use timestamp conversion multiple times in the project, you can encapsulate it as a function to simplify the code. The specific code is as follows:

function timestampToDatetime($timestamp) {
    $datetimeFormat = 'Y-m-d H:i:s';
    $datetime = new DateTime();
    $datetime->setTimestamp($timestamp);
    return $datetime->format($datetimeFormat);
}

$timestamp = time(); //获取当前时间戳
$datetime = timestampToDatetime($timestamp);
echo $datetime;

In this code, we define a function named timestampToDatetime() to convert the timestamp to date time format. The DateTime class is also used in the function to handle the conversion process.

In addition to this, PHP has many other methods to convert timestamps to datetime format. No matter which method is used, as long as you master one of them, you can easily complete the time stamp conversion work.

Summary

In PHP, timestamp is one of the important concepts in processing date and time. This article introduces four methods to convert timestamps to date and time format, including using the date() function, DateTime class, strftime() function, and custom functions. With these methods, converting timestamps into human-readable datetime formats during development becomes a piece of cake.

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