PHP timestamp and date conversion example sharing

UNIX timestamp and formatted date are two time representations that we often deal with. Unix timestamp is convenient to store and process, but not intuitive. Formatted date is intuitive, but it is not as easy to process as Unix timestamp, so there are When it is necessary to convert each other, the following are several conversion methods for PHP date to timestamp and MySQL date conversion functions to convert each other.

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 they are not Intuitive, formatting dates is intuitive, but it is not as easy to process as Unix timestamps, 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 for database queries. , there are limitations.
1. Use function to convert UNIX timestamp to date: FROM_UNIXTIME()

General form: select FROM_UNIXTIME(1156219870);

2. Convert date to UNIX Timestamp function: UNIX_TIMESTAMP()

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

Example: mysql query 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 not affected by the conversion range. Limitation, the disadvantage is that it takes up the parsing time of the PHP parser and is relatively slow.
1. Use the function to convert UNIX timestamp to date: date()

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

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

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

php date to timestamp, specified date to timestamp
php date to timestamp, specified date to timestamp, PHP scheduled task.
In the past two days, we need to implement this function:
When a certain condition is reached, let the server send multiple text messages to the user.
Basic idea: Linux scans regularly, and if there are users who meet the conditions, send text messages.
However, in order to prevent disturbing users, it is required that text messages can only be sent between 8:00-20:00 during the day. How to obtain this time range every day?
The code is as follows:
The code is as follows:

<?$y=date("Y",time());$m=date("m",time());$d=date("d",time());$start_time = mktime(9, 0, 0, $m, $d ,$y);$end_time = mktime(19, 0, 0, $m, $d ,$y);$time = time();if($time >= $start_time && $time <= $end_time)
{// do something....
}
?>

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