Use current Unix timestamp with microseconds in for loop in PHP

Description

The following code shows how to use current Unix timestamp with microseconds in for loop.

Example

<?php//from   www  . ja va2 s  . co  m

$startTime = microtime( true );

for ( $num = 1; microtime( true ) < $startTime + 0.0001; $num = $num * 2 ) {
  echo "Current number: $num<br />";
}

echo "Out of time!";

?>

The code above generates the following result.