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                                   microtime

   (PHP 3, PHP 4 )
   microtime --  Return current Unix timestamp with microseconds

Description

   mixed microtime ( [bool get_as_float])

   microtime() returns the current Unix timestamp with microseconds. This
   function is only available on operating systems that support the
   gettimeofday() system call.

   When called without the optional argument, this function returns the
   string "msec sec" where sec is the current time measured in the number
   of seconds since the Unix Epoch (0:00:00 January 1, 1970 GMT), and
   msec is the microseconds part. Both portions of the string are
   returned in units of seconds.

   When get_as_float is given, and evaluates to TRUE, microtime() will
   return a float.

     Note: The get_as_float parameter was added as of PHP 5.0.0.

   Example 1. microtime() example
   <?php
   function getmicrotime() {
       list($usec, $sec) = explode(" ", microtime());
       return ((float)$usec + (float)$sec);
   }
   $time_start = getmicrotime();

   for ($i=0; $i < 1000; $i++){
       // do nothing, 1000 times
   }
   $time_end = getmicrotime();
   $time = $time_end - $time_start;
   echo "Did nothing in $time seconds\n";
   // with PHP 5 you can do the same this way:
   $time_start = microtime(1);
   for ($i=0; $i < 1000; $i++){
        // do nothing, 1000 times
   }
   $time_end = microtime(1);
   $time = $time_end - $time_start;
   echo "Did nothing in $time seconds\n";
   ?>

   See also time().
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