while ($UneLigne = mysqli_fetch($resultat)) {
   mysqli_query("INSERT INTO risques (champ1, champ2, champ3) VALUES ('Je ne sais', '".$UneLigne[0]."', 'blabla') ", $db);
   $NumRisque = mysqli_insert_id($db);
   for ($x=1; $x<238; $x++) {
          mysli_query("INSERT INTO dangers (id_risque, LeDanger, Description) VALUES (".$NumRisque.", '".$UneLigne["Danger_".$x]."', '".$UneLigne["Description_".$x]."')
          mysli_query("INSERT INTO solutions (id_risque, LeDanger, Description) VALUES (".$NumRisque.", '".$UneLigne["Solution_".$x]."', '".$UneLigne["JeNeSais_".$x]."')
   }
}

1. une table risques
2. une table dangers
3. une table précisions
4. une table propositions

<table><tr><td>Lieux</td><td>Dangers</td><td>Solutions</td></tr>
<tr><td>Armoire</td><td>Danger 1  armoire</td><td>Solution 1 armoire</td></tr>
<tr><td>&nbsp;</td><td>Danger 2  armoire</td><td>Solution 2 armoire</td></tr>
<tr><td>&nbsp;</td><td>Danger 3  armoire</td><td>Solution 3 armoire</td></tr>
<tr><td>Garagee</td><td>Danger 1  garage</td><td>Solution 1 garage</td></tr>
<tr><td>&nbsp;</td><td>Danger 2  garage</td><td>Solution 2 garage</td></tr>
<tr><td>&nbsp;</td><td>Danger 3  garage</td><td>Solution 3 garage</td></tr>
</table>
.......

$resultat = mysqli_query ($db, $requete);
       $Nombre = mysqli_num_rows($resultat);

if ($Nombre > 0) {   //S'il y a des résultats
   while ($contenu = mysqli_fetch_assoc ($resultat)) {
   echo '<tr><td>'.$contenu['lieu'].'</td><td>'.$contenu['danger1'].'</td><td>'.$contenu['danger1_Precision'].'</td><td>'.$contenu['danger1_proposition'].'</td></tr>';
   echo '<tr><td>&nbsp;</td><td>'.$contenu['danger2'].'</td><td>'.$contenu['danger2_Precision'].'</td><td>'.$contenu['danger2_proposition'].'</td></tr>';
   echo '<tr><td>&nbsp;</td><td>'.$contenu['danger3'].'</td><td>'.$contenu['danger3_Precision'].'</td><td>'.$contenu['danger3_proposition'].'</td></tr>';
   }
} else {    //Si la requête n'a retourné aucun résultat
   echo '<tr><td colspan="4">Aucun résultat</td></tr>'; 
}

<?php
require_once ('connexion.php');
?>
 
 
<?php
//Déclaration de toutes les variables
$table = "risques" ;
 
$danger1_libelle = "Danger n°1" ;
$danger2_libelle = "Danger n°2" ;
$danger3_libelle = "Danger n°3" ;
$aucun = "Aucun danger" ;
$lieu = "lieu1" ;
 
// Définition de la largeur des 3 colonnes des tableaux
$largeur_colonne1 = "170px";
$largeur_colonne2 = "415px";
$largeur_colonne3 = "415px";
?>
 
 
 
<!-- ------------------------------------- -->
 
 
 
<?php
 
// On compte chaque enregistrements de "1" dans chaque colonne pour savoir si on affiche le tableau ou pas...
 
$requete = "SELECT COUNT(danger1) AS nb_danger1 FROM $table WHERE lieu ='$lieu' AND danger1 = '1'  ";
$resultat = mysql_query($requete)  or die('Erreur SQL !<br />'.$requete.'<br />'.mysql_error());
$columns = mysql_fetch_array($resultat);
$danger1 = $columns['danger1'];
 
$requete = "SELECT COUNT(danger2) AS nb_danger2 FROM $table WHERE lieu ='$lieu' AND danger2 = '1'  ";
$resultat = mysql_query($requete)  or die('Erreur SQL !<br />'.$requete.'<br />'.mysql_error());
$columns = mysql_fetch_array($resultat);
$danger2 = $columns['danger2'];
 
$requete = "SELECT COUNT(danger3) AS danger3 FROM $table WHERE lieu ='$lieu' AND danger3 = '1'  ";
$resultat = mysql_query($requete)  or die('Erreur SQL !<br />'.$requete.'<br />'.mysql_error());
$columns = mysql_fetch_array($resultat);
$danger3 = $columns['danger3'];
 
if (($danger1>0) or($danger2>0) or ($danger3>0))
{
include ("tableau_risque.php");
}
else
{
echo "";
}

mysql_close();
?>

<?php
 
// Tableau risque
 
$requete = ("SELECT * FROM $table WHERE lieu ='$lieu' AND aucun !='1'");
$resultat = mysql_query($requete)  or die('Erreur SQL !<br />'.$requete.'<br />'.mysql_error());
 
echo "<table cellpadding='5' border='1' width'auto'>";
 
// Les colonnes de titres
echo "
<tr align='center'>
<td width=$largeur_colonne1>Dangers identifiés</td>
<td width=$largeur_colonne2>Précisions</td>
<td width=$largeur_colonne3>Propositions</td>
</tr>\n";
 
while ($row = mysql_fetch_array($resultat))
{
$danger1=($row[danger1]);
if ($danger1=="0") {$danger1="";} else {$danger1=$danger1_libelle."<br>";}
 
$danger2=($row[danger2]);
if ($danger2=="0") {$danger2="";} else {$danger2=$danger2_libelle."<br>";}
 
$danger3=($row[danger3]);
if ($danger3=="0") {$danger3="";} else {$danger3=$danger3_libelle."<br>";}
 
 
 
$danger1_Precision=($row[danger1_Precision]);
if ($danger1_Precision!="") {$danger1_Precision=$danger1_Precision."<br>";}
$danger1_Proposition=($row[danger1_Proposition]);
if ($danger1_Proposition!="") {$danger1_Proposition=$danger1_Proposition."<br>";}
 
$danger2_Precision=($row[danger2_Precision]);
if ($danger2_Precision!="") {$danger2_Precision=$danger2_Precision."<br>";}
$danger2_Proposition=($row[danger2_Proposition]);
if ($danger2_Proposition!="") {$danger2_Proposition=$danger2_Proposition."<br>";}
 
$danger3_Precision=($row[danger3_Precision]);
if ($danger3_Precision!="") {$danger3_Precision=$danger3_Precision."<br>";}
$danger3_Proposition=($row[danger3_Proposition]);
if ($danger3_Proposition!="") {$danger3_Proposition=$danger3_Proposition."<br>";}
 
echo "
<tr>
<td>
$danger1
$danger2
$danger3
</td>
 
<td style='color:red;'>
$danger1_Precision
$danger2_Precision
$danger3_Precision
</td>
 
<td>
$danger1_Proposition
$danger2_Proposition
$danger3_Proposition
</td>
";
echo "</tr>";
}
echo "</table><br><br>";
?>