PHP: measure TTFB (Time To First Byte)

You can solve this with curl:

$url = 'https://www.example.com/';
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 0);
curl_setopt($ch, CURLOPT_NOBODY, 1);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 0);
curl_exec($ch);
$info = curl_getinfo($ch);
curl_close($ch);
echo "TTFB of ".$url." is: ".$info['starttransfer_time'];

Result

TTFB of https://www.example.com/ is: 0.67417

There is a good Curl wrapper here: https://packagist.org/packages/curl/curl

If you already have installed Composer, just do 'composer require curl/curl' and use it.

Regards.