RewriteEngine on
RewriteRule (.*)\.html /membre.php?gid=$1 [L]

$nom = 'Jean Pierre';
echo str_replace(' ', '-', strtolower($nom));

// Retournera: jean-pierre

function no_accent($str_accent) {
   $pattern = Array("/é/", "/è/", "/ê/", "/ç/", "/à/", "/â/", "/î/", "/ï/", "/ù/", "/ô/" );
   $rep_pat = Array("e", "e", "e", "c", "a", "a", "i", "i", "u", "o" );
   $str_noacc = preg_replace($pattern, $rep_pat, $str_accent);
   return $str_noacc;
}

function make_url($a_titre) {
   $url = no_accent($a_titre);
   $url_bad = array("@ @", "@-@", "@[^A-Za-z0-9_]@", "@_+@" );
   $url_good = array("_", "_", "", "_" );
   $url = preg_replace($url_bad, $url_good, $url);
   return $url;
}

<?php

$query="SELECT id,description,nom,ville FROM membre ORDER by id DESC";
$resultat=mysql_query($query);
if (!$resultat)
{
echo "problème ne pas afficher";
}
while($row=mysql_fetch_array($resultat))

{
        $id=$row["id"];
        $nom=$row["nom"];
        $description=$row["description"];
        $nom=$row["nom"];
        $description=str_replace(' ', '_', strtolower($description));
        echo "<a href=\"$gid-$nom_$description.html\" class=\"lienblanc\">$nom - $ville - $description<br>";
}

?>

function ZapCaractere($str){
$ch = strtr(strtolower($str),'àáâãäåçèéêëìíîïðòóôõöùúûüýÿ','aaaaaaceeeeiiiioooooouuuuyy');
return preg_replace('`([^a-z0-9]+)`i', '-', $ch);
}

<?php

function ZapCaractere($str){
$ch = strtr(strtolower($str),'àáâãäåçèéêëìíîïðòóôõöùúûüýÿ','aaaaaaceeeeiiiioooooouuuuyy');
return preg_replace('`([^a-z0-9]+)`i', '-', $ch);
}

$query="SELECT id,description,nom,ville FROM membre ORDER by id DESC";
$resultat=mysql_query($query);
if (!$resultat)
{
echo "problème ne pas afficher";
}
while($row=mysql_fetch_array($resultat))

{
        $id = $row["id"];
        $nom = $row["nom"];
        $description = $row["description"];
        $nom = $row["nom"];
        $description = ZapCaractere($description);
        echo "<a href=\"$gid-$nom_$description.html\" class=\"lienblanc\">$nom - $ville - $description</a><br>";
}

?>