#php execution profiling, get elapsed time

time-elapsed.php

<?php

function get_execution_time()
{
    static $microtime_start = null;
    if($microtime_start === null)
    {
        $microtime_start = microtime(true);
        return 0.0; 
    }    
    return microtime(true) - $microtime_start; 
}

function get_execution_time_alt() {
  return microtime(true) - $_SERVER["REQUEST_TIME_FLOAT"];
}


//usage
get_execution_time();
sleep(2);
echo 'elapsed time ' . get_execution_time() . ' seconds';

//usage
sleep(1);
echo 'elapsed time ' . get_execution_time_alt() . ' seconds';