Accurate way to measure execution times of php scripts

Question

I want to know how many milliseconds a PHP for-loop takes to execute    I know the structure of a generic algorithm  but no idea how to implement it in PHP   Begin init1   timer       where timer   is the amount of milliseconds from midnight the loop begin some code the loop end total   timer   - init1  End

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You can find the execution time in second with a single function      ampersand is important thing here function microSec   amp   ms         if   floatval   ms      0             ms   microtime  true              else            originalMs    ms           ms   0          return microtime  true   -  originalMs              you don t have to define  ms variable  just function needs    it to calculate the difference  microSec  ms   sleep 10   echo microSec  ms      seconds      10 seconds  for   i   0   i  lt  10   i             you can use same variable everytime without assign a value     microSec  ms       sleep 1       echo microSec  ms      seconds      1 second    for   i   0   i  lt  10   i             also you can use temp or useless variables     microSec  xyzabc       sleep 1       echo microSec  xyzabc      seconds      1 second

User · Answer

You have the right idea  except a more precise timing is available with the microtime   function   If what is inside the loop is fast  it is possible that the apparent elapsed time will be zero   If so  wrap another loop around the code and call it repeatedly   Be sure to divide the difference by the number of iterations to get a per-once time    I have profiled code which required 10 000 000 iterations to get consistent  reliable timing results

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start   microtime true   for   i   0   i  lt  10000     i           do something    total   microtime true  -  start  echo  total

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See microtime

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Here is my script to measure average time   lt  php   times        nbrOfLoops   4  for   i   0   i  lt   nbrOfLoops     i         start   microtime true       sleep 1        times     microtime true  -  start     echo  Average       array sum  times    count  times      seconds

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Here is very simple and short method   lt  php  time start   microtime true     the loop begin   some code   the loop end  time end   microtime true    total time    time end -  time start  echo  total time     or whatever u want to do with the time   gt

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if you like to display that time in seconds   lt  php  class debugTimer       private  startTime      private  callsCounter       function   construct                  this- gt startTime   microtime true            this- gt callsCounter   0             public function getTimer    float                timeEnd   microtime true            time    timeEnd -  this- gt startTime           this- gt callsCounter            return  time             public function getCallsNumber    int               return  this- gt callsCounter            timer   new debugTimer    usleep 100   echo   lt br   gt  n          timer- gt getTimer       seconds before call       timer- gt getCallsNumber     usleep 100   echo   lt br   gt  n          timer- gt getTimer       seconds before call       timer- gt getCallsNumber

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You can use the microtime function for this  From the documentation      microtime     Return current Unix timestamp with microseconds            If get as float is set to TRUE  then microtime   returns a float  which represents the current time in seconds since the Unix epoch accurate to the nearest microsecond    Example usage    start   microtime true   while             time elapsed secs   microtime true  -  start

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You can use REQUEST TIME from the   SERVER superglobal array  From the documentation      REQUEST TIME   The timestamp of the start of the request   Available since PHP 5 1 0        REQUEST TIME FLOAT   The timestamp of the start of the request  with microsecond precision   Available since PHP 5 4 0     This way you don t need to save a timestamp at the beginning of your script  You can simply do    lt  php    Do stuff usleep mt rand 100  10000        At the end of your script  time   microtime true  -   SERVER  REQUEST TIME FLOAT     echo  Did stuff in  time seconds n     gt    Here   time would contain the time elapsed since the start of the script in seconds  with microseconds precision  eg  1 341 for 1 second and 341 microseconds     More info   PHP documentation     SERVER variables and microtime function

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Here s an implementation that returns fractional seconds  i e  1 321 seconds          MICROSECOND STOPWATCH FOR PHP       Class FnxStopwatch     class FnxStopwatch            var float        private  start               stop       public function start                  this- gt start   self  microtime float              public function stop                  this- gt stop   self  microtime float              public function getIntervalSeconds     float                  NOT STARTED         if  empty  this- gt start               return 0             NOT STOPPED         if  empty  this- gt stop               return   this- gt stop - self  microtime float              return  interval    this- gt stop -  this- gt start                        FOR MORE INFO SEE http   us php net microtime                return float             private static function microtime float     float               list  usec   sec    explode      microtime              return   float  usec    float  sec

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I thought I d share the function I put together  Hopefully it can save you time   It was originally used to track timing of a text-based script  so the output is in text form  But you can easily modify it to HTML if you prefer   It will do all the calculations for you for how much time has been spent since the start of the script and in each step  It formats all the output with 3 decimals of precision   Down to milliseconds    Once you copy it to the top of your script  all you do is put the recordTime function calls after each piece you want to time   Copy this to the top of your script file    tRecordStart   microtime true   header  Content-Type  text plain    recordTime  Start     function recordTime   sName      global  tRecordStart    static  tStartQ     tS   microtime true      tElapsedSecs    tS -  tRecordStart     tElapsedSecsQ    tS -  tStartQ     sElapsedSecs   str pad number format  tElapsedSecs  3   10       STR PAD LEFT      sElapsedSecsQ   number format  tElapsedSecsQ  3     echo       sElapsedSecs   -    sName    if   empty  tStartQ   echo   In    sElapsedSecsQ  s     echo   n      tStartQ    tS      To track the time that passes  just do   recordTime  What We Just Did     For example   recordTime  Something Else     Do really long operation  recordTime  Really Long Operation     Do a short operation  recordTime  A Short Operation     In a while loop  for   i   0   i  lt  300   i         recordTime  Loop Cycle    i      Gives output like this          0 000 - Start        0 001 - Something Else In 0 001s       10 779 - Really Long Operation In 10 778s       11 986 - A Short Operation In 1 207s       11 987 - Loop Cycle 0 In 0 001s       11 987 - Loop Cycle 1 In 0 000s           12 007 - Loop Cycle 299 In 0 000s   Hope this helps someone

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Create file loadtime php   lt  php class loadTime      private  time start         0      private  time end           0      private  time               0      public function   construct             this- gt time start  microtime true             public function   destruct             this- gt time end   microtime true            this- gt time    this- gt time end -  this- gt time start          echo  Loaded in  this- gt time seconds n             Than in the beggining of your script  after  lt  php write include  loadtime php    loadtime new loadTime     When page is loaded at the end there will be written  Loaded in x seconds

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You can use microtime true  with following manners   Put this at the start of your php file     place this before any script you want to calculate time  time start   microtime true        your script code goes here     do something   Put this at the end of your php file      Display Script End time  time end   microtime true      dividing with 60 will give the execution time in minutes other wise seconds  execution time     time end -  time start  60     execution time of the script echo   lt b gt Total Execution Time  lt  b gt     execution time   Mins     It will output you result in minutes

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Here is a function that times execution of any piece of PHP code  much like Python s timeit module does  https   gist github com flaviovs 35aab0e85852e548a60a  How to use it   include  timeit php    const SOME CODE             strlen  foo bar        t   timeit SOME CODE   print   t 0  loops   t 2  per loop n     Result     php x php  100000 loops  18 08us per loop   Disclaimer  I am the author of this Gist  EDIT  timeit is now a separate  self-contained project at https   github com flaviovs timeit

[php] Accurate way to measure execution times of php scripts

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