PHP time function example: comparison of time

In web development, dealing with time is a very common task. PHP provides many built-in functions to handle time and date, which make handling time and date in PHP easier and more efficient. In this article, we will explore an example of PHP time functions, how to compare two times.

PHP method of comparing time

PHP provides several functions that can be used to compare two times. Here is a brief introduction to these functions:

1. strtotime()
   The strtotime() function parses the date and time description of any English text into a Unix timestamp, making it easier to Comparison operations. The syntax is as follows:

   strtotime(timeString);

   The timeString parameter specifies the text description of the time, which can be a date, time, or a combination of date and time.

2. time()
   The time() function is used to get the Unix timestamp of the current time, in seconds.
3. Comparison of strtotime() and time()
   You can compare the date parsed by strtotime() with the current time obtained by time() to determine whether one time is earlier, later than or equal to the other. a time.

The following is an example of PHP time comparison:

// Set 2 dates
$date1 = "2018-11-05 23 :45:23";
$date2 = "2018-11-06 23:45:23";

// Convert string date to timestamp
$time1 = strtotime($ date1);
$time2 = strtotime($date2);

// Compare 2 dates
if ($time1

echo "date1 早于 date2";

} elseif ( $time1 > $time2) {

echo "date1 晚于 date2";

} else {

echo "二者时间相同";

}
?>

In the above code, we first define two String variables of time, namely $date1 and $date2. We then use the strtotime() function to convert these two strings into Unix timestamps and store them into the $time1 and $time2 variables. Finally, we use the if else statement to compare the two times and finally output the result of the comparison.

Summary

Comparing time in PHP is easy, just use specific PHP time functions. We use the strtotime() function to convert any textual description of time into a Unix timestamp and then use the timestamps for comparison. In this way, we can know whether a certain time is earlier, later than, or equal to another time. Mastering the PHP time functions can make us more comfortable when dealing with time and date issues in web applications.

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