Briefly describe how to use PHP to convert time into timestamp

PHP (Hypertext Preprocessor) is a commonly used server-side scripting language that can be used for dynamic web development and enterprise-level application development. In PHP, time format processing is often required. One common task is to convert time into a timestamp. In this article, we will introduce how to convert time into timestamp using PHP.

1. What is a timestamp?

A timestamp is a data type that represents time. It represents the time since January 1, 1970, 0:00:00 (midnight UTC/GMT). ) to the current time in seconds. Timestamps are often used to record or compare times.

2. PHP gets the current time

To convert the time into a timestamp, you first need to get the current time. In PHP, you can use the date() function to get the current time. The syntax of this function is as follows:

date(format,timestamp)

Among them, the format parameter is required, which specifies the format of the time. The timestamp parameter is optional. If this parameter is not passed, the current system time will be used by default.

The following is an example of using the date() function to obtain the current time:

$now = date("Y-m-d H:i:s");
echo $now;

Output result:

2022-06-23 12:30:00

In the above code, the first parameter of the date() function The specified time format is year-month-day hour:minute:second. Since no second parameter is passed, the current system time is used by default. We can modify the time format as needed.

3. PHP converts time into timestamp

To convert time into timestamp, you can use the strtotime() function. This function can convert multiple time formats into Unix timestamps. The syntax is as follows:

strtotime(time,now)

The time parameter is required and represents the time to be converted. The now parameter is optional and represents the current time. If this parameter is not passed, the current system time is used by default.

The following is an example of using the strtotime() function to convert time into a timestamp:

$time = "2022-06-23 12:30:00";
$timestamp = strtotime($time);
echo $timestamp;

Output result:

1656053400

In the above code, the strtotime() function converts the time The string is converted into a timestamp. We can replace the time string with the time that needs to be converted. It should be noted that the time format in the strtotime() function must be a legal time format, otherwise it will not be converted correctly.

4. PHP converts timestamps into time

To convert timestamps into time, you can use the date() function. This function can format the Unix timestamp into any desired time format. The syntax is as follows:

date(format,timestamp)

Among them, the format parameter is required and indicates the time format that needs to be formatted. The timestamp parameter is optional and represents the Unix timestamp that needs to be formatted. If this parameter is not passed, the current system time is used by default.

The following is an example of using the date() function to convert a timestamp into a time:

$timestamp = 1656053400;
$time = date("Y-m-d H:i:s",$timestamp);
echo $time;

Output result:

2022-06-23 12:30:00

In the above code, the date() function converts the time The stamp is formatted as a time string of year-month-day hour:minute:second. We can replace the timestamp with the timestamp that needs to be formatted.

Summary

In PHP, use the date() function to obtain the current time, use the strtotime() function to convert the time into a timestamp, and use the date() function to convert the timestamp. into time. These functions are very practical and can be used for time format processing in daily work. At the same time, you need to pay attention to the legality of the time format, otherwise it will lead to wrong results.

The above is the detailed content of Briefly describe how to use PHP to convert time into timestamp. For more information, please follow other related articles on the PHP Chinese website!