PHP time processing function

//mktime()
Convert date and time to unix timestamp
//time()
Get the unix timestamp of the current time
echo date("Y-m-d",mktime(0 ,0,0,12,31,2013))."";

//Example: Calculate the age of a user by calculating the difference between two unix timestamps

$year = 1991;
 //Suppose the user's date of birth is 1991.07.16
$month = 07;
$day = 16;
$brithday = mktime(0,0,0,$month,$day,$year);
//Replace the user Convert the date of birth to a unix timestamp
$nowdate = time();
//Get the unix timestamp of the current time
$ageunix = $nowdate - $brithday;
//Get the difference in timestamps
$age = floor ($ageunix / (60*60*24*365));
//The difference in timestamps divided by the number of seconds per year is the user's actual age
echo "The user's age is ".$age."< ;br> The sunrise time of a certain day
//date_sunset()
The sunset time of a certain day
//date()
Format a local time and date
//microtime()
Return the current UNIX timestamp and microseconds
/ /The following class calculates the execution time of the program by obtaining the execution time of the two functions
class Timer{
private $startTime;
private $stopTime;
function __construct(){
$this->startTime = 0;
 $this->stopTime = 0;
}
function start(){
$this->startTime = microtime(true);
}
function stop(){
$this->stopTime = microtime(true) ;
}
function spent(){
return round(($this->startTime - $this->stopTime),4);
}
}
$timer = new Timer();
$timer-> ;start();
usleep(1000);
$timer->stop();
echo "Time to execute script".$timer->spent()."seconds" ;
?>



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