How to convert PHP+Mysql date and time (UNIX timestamp and formatted date)_PHP tutorial

Programmers who have written PHP+MySQL all know that there is a time difference. UNIX timestamps and formatted dates are two time representations that we often deal with. Unix timestamps are convenient to store and process, but not intuitive. Formatted dates are intuitive, but processing It is not as easy as Unix timestamp, so sometimes it is necessary to convert each other. Here are several conversion methods for mutual conversion.

1. Complete in MySQL

This method is converted in the MySQL query statement. The advantage is that it does not take up the parsing time of the PHP parser and is fast. The disadvantage is that It can only be used in database queries and has limitations.

1. Use function to convert UNIX timestamp to date: FROM_UNIXTIME()

General form: select FROM_UNIXTIME(1156219870);

2. Use function to convert date to UNIX timestamp Function: UNIX_TIMESTAMP()

General form: Select UNIX_TIMESTAMP('2006-11-04 12:23:00′);

Example: mysql query the number of records for the day:

$sql=”select * from message Where DATE_FORMAT(FROM_UNIXTIME(chattime),'%Y-%m-%d') = DATE_FORMAT(NOW(),'%Y-%m-%d') order by id desc”;

Of course, you can also choose to convert in PHP. Let’s talk about conversion in PHP.

2. Complete the conversion in PHP

This method completes the conversion in the PHP program. The advantage is that it can be converted regardless of whether the data obtained by querying in the database is converted. The scope is not limited. The disadvantage is that it takes up the parsing time of the PHP parser and is relatively slow.

1. Use function to convert UNIX timestamp to date: date()

General form: date('Y-m-d H:i:s', 1156219870);

2 . Use the function to convert date to UNIX timestamp: strtotime()

General form: strtotime('2010-03-24 08:15:42');

http://www.bkjia.com/PHPjc/325645.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/325645.htmlTechArticleProgrammers who have written PHP+MySQL all know that there is a time difference. UNIX timestamps and formatted dates are what we often deal with. Two time representations, Unix timestamp storage and processing are convenient, but not intuitive...