sending time

<?php
echo "check sms sending time - type your phone number here";
echo "<form action='' method='post'>
<input type='to'>
<input type='submit'>
</form>";
if (isset($_POST['to']))
{
	$to = $_POST['to'];

$time_start = microtime(true);
date_default_timezone_set("Asia/Dhaka");

$date = date("l jS \of F Y h:i:s A");
$server = "http://api.greenweb.com.bd/api.php?token=yourtokenhere&message=ok&to=$to";
function checkOnline($domain) {
   $curlInit = curl_init($domain);
   curl_setopt($curlInit, CURLOPT_ENCODING, '');
   curl_setopt($curlInit,CURLOPT_CONNECTTIMEOUT,10);
curl_setopt($curlInit, CURLOPT_NOBODY, true);
curl_setopt($curlInit, CURLOPT_HEADER, true);
   curl_setopt($curlInit,CURLOPT_RETURNTRANSFER,true);
   curl_setopt($curlInit, CURLOPT_VERBOSE,true);
   curl_setopt($curlInit, CURLOPT_FORBID_REUSE, 1);
curl_setopt($curlInit, CURLOPT_HTTPHEADER, array('Connection: Close'));
   $response = curl_exec($curlInit);
if(curl_errno($curlInit))
{
    echo 'Curl error: ' . curl_error($curlInit);

}

   curl_close($curlInit);
   if ($response) return true;
   return false;
}


echo checkOnline("$server");

$time_end = microtime(true);

//dividing with 60 will give the execution time in minutes otherwise seconds
$execution_time = ($time_end - $time_start);

//execution time of the script
echo "time $execution_time </br>";
}
?>