Usage and example analysis of php time function

This article mainly introduces the usage of PHP time function, and analyzes the usage of PHP timestamp related functions time, mktime, date and strtotime in the form of examples. It is very simple and practical. Friends who need it can refer to it

php has unix timestamp related operation functions, which are very convenient to use

time() returns the current Unix timestamp

microtime - - Returns the current Unix timestamp and microseconds

Example 1. Use microtime() to time the execution of the script

<?php
/**
* Simple function to replicate PHP 5 behaviour
*/
function microtime_float()
{
  list($usec, $sec) = explode(" ", microtime());
  return ((float)$usec + (float)$sec);
}
$time_start = microtime_float();
// Sleep for a while
usleep(100);
$time_end = microtime_float();
$time = $time_end - $time_start;
echo "Did nothing in $time seconds/n";
?>

mktime() Gets the Unix timestamp of a date

int mktime ([int hour [, int minute [, int second [, int month [, int day [, int year [, int is_dst]]]]]]] )

Parameters can be omitted from right to left. Any omitted parameter will be set to the current value of the local date and time

date( )Format a local time/date

string date ( string format [, int timestamp] )

Tip: Save in $_SERVER['REQUEST_TIME'] since PHP 5.1 The timestamp of the time when the request was initiated.

strtotime -- Parse the date and time description of any English text into a Unix timestamp

echo strtotime("+1 day"), "/n";
echo strtotime("+1 week"), "/n";

Example 2. A certain time The day after, the month after

strtotime("+1 day ".$day);
strtotime("2008-01-31 +1 month");
strtotime($day." +1 day");

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