PHP logging system

Question

I wanted to record everything that happens on my site, from logins, logging (Insert), updating and deletion.
Like that:

[14-05-2016 17:53] User Andre logged in with IP: 111.111.111.111
[14-05-2016 17:54] User Andre eliminated client with ID 2
[14-05-2016 17:55] User Andre created client with ID 3

I created a script in php to write the records to a file log.log
Contents of the file regista.php

<?php
date_default_timezone_set('Europe/Lisbon'); $cache_new = date("\[d-m-Y H:i\] ");
header('Content-Type: text/html; charset=utf-8');

$cache_new .= $_GET['q']; 

$file = "C:\\xampp\\htdocs\\pap\\registos\\log.log"; 
$cache_new .= "\n";
$handle = fopen($file, "r+") or die ();
$len = strlen($cache_new);
$final_len = filesize($file) + $len;
$cache_old = fread($handle, $len);
rewind($handle);
$i = 1;
while (ftell($handle) < $final_len) {
  fwrite($handle, $cache_new);
  $cache_new = $cache_old;
  $cache_old = fread($handle, $len);
  fseek($handle, $i * $len);
  $i++;
}
?>

If I go to http://meusite/registo/regista.php?q=Utilizador fez login it will register in the file.
But I wanted automatic, for example the file eliminar.php, after the script delete the database client will log.

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "http://omeusite/registos/regista.php?q=Utilizador fez login");
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

$output = curl_exec($ch);
curl_close($ch);
echo $output;

By putting this into eliminar.php, after executing the query in the database the page is extremely slow and does not record the entry.
What I did wrong?