PHP Time processing function

Mktime () Convert date and time to UNIX timestamp Time () Gets the Unix timestamp for the current time echo Date ("Y-m-d", Mktime (0,0,0,12,31,2013)). " "; Example: Calculates the age of a user by calculating the difference of two Unix timestamps $year = 1991; Assuming the user's birth date is 1991.07.16 $month = 07; $day = 16; $brithday = Mktime (0,0,0, $month, $day, $year); Convert a user's birth date to a Unix timestamp $nowdate = time (); Get the Unix timestamp for the current time $ageunix = $nowdate-$brithday; Get the difference between timestamps $age = Floor ($ageunix/(60*60*24*365)); The difference between timestamps divided by the number of seconds per year is the actual age of the user echo "The age of the user is". $age. " "; Date_default_timezone_set () Setting the time zone GETDATE () Determine the current time Gettimeofday () Get a specific time in a day Date_sunrise () Sunrise Time of one day Date_sunset () Sunset time of one day Date () Format a local time and date Microtime () Returns the current UNIX timestamp and number of microseconds The following class calculates the execution time of a program by obtaining the execution time of 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 "Execute script Time ". $timer->spent (). " Seconds "; ?> Copy Code

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