Find out the execution time of a query in php/mysql | Learning Curve- Perfect Tutorial for the beginers

<?php
$linkfirst = mysql_connect('localhost', 'root', '');
if (!$linkfirst) {
   die('Could not connect: ' . mysql_error());
}
mysql_select_db('hello', $linkfirst) or die('Could not select database.');


 $firsttime = microtime(true);

//$rs = mysql_query('select * from employee',$linkfirst); // ordinary query execution
$rs = mysql_query('CALL get_employee()'); //stored procedure execution
while($row = mysql_fetch_assoc($rs))
{
echo $row['Name']; echo "<br>";
}
$secondtime = microtime(true);

echo $newTime = $secondtime-$firsttime; 



?>

<?php

$linkfirst = mysql_connect('localhost', 'root', '');

if (!$linkfirst) {

die('Could not connect: ' . mysql_error());

}

mysql_select_db('hello', $linkfirst) or die('Could not select database.');

$firsttime = microtime(true);

//$rs = mysql_query('select * from employee',$linkfirst); // ordinary query execution

$rs = mysql_query('CALL get_employee()'); //stored procedure execution

while($row = mysql_fetch_assoc($rs))

{

echo $row['Name']; echo "<br>";

}

$secondtime = microtime(true);

echo $newTime = $secondtime-$firsttime;