Start and stop a timer PHP

I need some information regarding starting and stopping a timer in PHP. I need to measure the elapsed time from the start of my .exe program (I'm using exec() function in my php script) until it completes the execution and display the time it took in seconds.

How can I do this?

Solution 1:

You can use microtime and calculate the difference:

$time_pre = microtime(true);
exec(...);
$time_post = microtime(true);
$exec_time = $time_post - $time_pre;

Here's the PHP docs for microtime: http://php.net/manual/en/function.microtime.php

Solution 2:

Since PHP 7.3 the hrtime function should be used for instrumentation.

$start = hrtime(true);
// run your code...
$end = hrtime(true);   

echo ($end - $start);                // Nanoseconds
echo ($end - $start) / 1000000;      // Milliseconds
echo ($end - $start) / 1000000000;   // Seconds

The mentioned microtime function relies on the system clock. Which can be modified e.g. by the ntpd program on ubuntu or just the sysadmin.

Solution 3:

Use the microtime function. The documentation includes example code.

Solution 4:

For your purpose, this simple class should be all you need:

class Timer {
    private $time = null;
    public function __construct() {
        $this->time = time();
        echo 'Working - please wait..<br/>';
    }

    public function __destruct() {
        echo '<br/>Job finished in '.(time()-$this->time).' seconds.';
    }
}


$t = new Timer(); // echoes "Working, please wait.."

[some operations]

unset($t);  // echoes "Job finished in n seconds." n = seconds elapsed

Solution 5:

You can use Timer Class

    <?php

class Timer {

   var $classname = "Timer";
   var $start     = 0;
   var $stop      = 0;
   var $elapsed   = 0;

   # Constructor
   function Timer( $start = true ) {
      if ( $start )
         $this->start();
   }

   # Start counting time
   function start() {
      $this->start = $this->_gettime();
   }

   # Stop counting time
   function stop() {
      $this->stop    = $this->_gettime();
      $this->elapsed = $this->_compute();
   }

   # Get Elapsed Time
   function elapsed() {
      if ( !$elapsed )
         $this->stop();

      return $this->elapsed;
   }

   # Resets Timer so it can be used again
   function reset() {
      $this->start   = 0;
      $this->stop    = 0;
      $this->elapsed = 0;
   }

   #### PRIVATE METHODS ####

   # Get Current Time
   function _gettime() {
      $mtime = microtime();
      $mtime = explode( " ", $mtime );
      return $mtime[1] + $mtime[0];
   }

   # Compute elapsed time
   function _compute() {
      return $this->stop - $this->start;
   }
}

?>