Explication code PHP

[tortuegenie]

Bonjour j'essaye de comprendre un code php car je dois faire la meme chose (si c'est possible en asp.net). Est ce que quelqu'un pourrait m'expliquer ce que fais ce code. Merci

Code :

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$server = "http://toto/";
$user = "Archivio1";
$pass = "***";
$file = "file.txt";
 
$url1 = $server."yaya=ID=748925";
 
echo "$url1\n";
 
$ch = curl_init();
 
curl_setopt($ch, CURLOPT_URL, $url1);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_USERPWD, "$user:$pass");
$info = curl_getinfo($ch);
 
$page1 = curl_exec($ch);
 
$url2 = substr($page1, strpos($page1, 'BvLTech1_______'));
$url2 = $server.substr($url2, 0, strpos($url2, '"'));
 
echo "$url2\n";
 
curl_setopt($ch, CURLOPT_URL, $url2);
$page2 = curl_exec($ch);
 
$url3 = substr($page2, strpos($page2, 'RNVL/BvLArchivio'));
$url3 = $server.substr($url3, 0, strpos($url3, '"'));
 
echo "$url3\n";
 
curl_setopt($ch, CURLOPT_URL, $url3);
 
$fh = fopen($file, 'w');
 
curl_setopt($ch, CURLOPT_RETURNTRANSFER, false);
curl_setopt($ch, CURLOPT_FILE, $fh);
curl_exec($ch);
 
fclose ($fh);
 
curl_close($ch);