Get the execution time of the PHP program

update time:2017-07-21 14:20:10
If you want calculate a PHP code execution time and reduce execution time, try the code below.
Code From:

        function get_microtime() 
            list($usec, $sec) = explode(' ', microtime()); 
            return ((float)$usec + (float)$sec); 
    $start    =    get_microtime(); 
    for ($i=1;$i<1000000;$i++)
        //echo $i;
    $end    =    get_microtime(); 
    echo round(($end- $start) * 1000, 1);      

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