Description:
------------
There is a problem when I select a line in mysql table and afet I delete it.


Reproduce code:
---------------
It works : 
$sql = 'SELECT * FROM sous_domaine WHERE id="10" ';
$req = mysql_query($sql) or die('Erreur SQL !<br>'.$sql.'<br>'.mysql_error()); 
while($data = mysql_fetch_assoc($req)) {
 echo $data['id'];
}
$sql2 = 'DELETE FROM sous_domaine WHERE id="10" ';
$req2 = mysql_query($sql2) or die('Erreur SQL !<br>'.$sql2.'<br>'.mysql_error());

It don't work : 

$sql = 'SELECT * FROM sous_domaine WHERE id="'.$_GET['id'].'" ';
$req = mysql_query($sql) or die('Erreur SQL !<br>'.$sql.'<br>'.mysql_error()); 
while($data = mysql_fetch_assoc($req)) {
 echo $data['id'];
}
$sql2 = 'DELETE FROM sous_domaine WHERE id="'.$_GET['id'].'" ';
$req2 = mysql_query($sql2) or die('Erreur SQL !<br>'.$sql2.'<br>'.mysql_error());

Expected result:
----------------
In first case (it works) : I see the id get in mysql and it delete it after

In second case (it don't work) : I don't see id get in mysql. It's like if it delete it first and after select.

I have not error in php log.