How to convert specified time into timestamp using PHP

PHP (Hypertext Preprocessor) is a widely used server-side scripting language commonly used to develop web applications. When developing web applications, we often need to convert a date and time into a timestamp for comparison, sorting and other operations. This article explains how to convert time into timestamp using PHP.

1. Time formatting

In PHP, we can use the date() function to format the date into the required string format. This function has two parameters:

date(string $format, int $timestamp = time())

Among them, $format is the string that needs to be formatted, $timestamp is an optional parameter, indicating the timestamp that needs to be formatted. If this parameter is not passed, the current one will be used by default. The timestamp of the time (returned by the time() function).

For example, the following code formats the current time into a standard date and time format:

echo date("Y-m-d H:i:s");

Output result:

2021-03-27 15:22:39

2. Convert time to time Stamp

In PHP, we can use the strtotime() function to convert a string time into a timestamp. This function has one parameter:

strtotime(string $time, int $now = time())

Among them, $time is the string time that needs to be converted into a timestamp. $now is an optional parameter, indicating the timestamp of the current time. If this parameter is not passed, it will be used by default. The timestamp of the current time (returned by the time() function).

For example, the following code converts the string time "2021-03-20 12:30:00" into a timestamp:

echo strtotime("2021-03-20 12:30:00");

Output result:

1616239800

3. Get date and time information from timestamp

In PHP, we can use the date() function to get date and time information from timestamp. This function has two parameters:

date(string $format, int $timestamp)

Among them, $format is the string format that needs to be formatted, and $timestamp is the timestamp.

For example, the following code converts timestamp 1616239800 into standard date and time format:

echo date("Y-m-d H:i:s", 1616239800);

Output result:

2021-03-20 12:30:00

4. Summary

In PHP, we can use the date() function to format the date into the required string format, use the strtotime() function to convert the string time into a timestamp, and use the date() function to convert the date from Get the date and time information from the timestamp. These functions are very useful when developing Web applications, and they should be fully utilized in practical applications to improve development efficiency.

The above is the detailed content of How to convert specified time into timestamp using PHP. For more information, please follow other related articles on the PHP Chinese website!