postgres update script using php not working - php

Question

i want to update rows in my table postgresql using php , i can't have my rows updated , and no error is displayed , i don't see the problem in my script ! here is my table structure:
CREATE TABLE chercheur
(
nomcher text,
idfcher text NOT NULL,
precher text,
passcher text,
mailcher text,
gradcher text,
naisscher date,
lieucher text,
divicher text,
CONSTRAINT "Chercheur_pkey" PRIMARY KEY (idfcher)
)
and the program:
$conn = pg_pconnect("dbname=postgres host=localhost port=5432 user=postgres password=postgres");
if ($conn) {
//print "Successfully connected to database: " . pg_dbname($conn) .
// " on " . pg_host($conn) . "</br>\n";
$id = pg_escape_string($_POST['identif']);
$result = pg_query($conn, "SELECT * from chercheur WHERE idfcher='" . $id . "';");
} else {
print pg_last_error($conn);
exit;
}
if (!$result) {
$errormessage = pg_last_error();
echo "Error with query: " . $errormessage;
exit();
} else {
while ($myrow = pg_fetch_row($result)) {
echo '<hr><h2>Informations du chercheur trouvé:</h2>';
echo '<table>
<tr>
<td><label for="nom">Nom du chercheur</label></td>
<td><input value="' . $myrow[0] . '" name="nom" id="nom" type="text" /></td>
</tr>
<td> <label for="prenom">Prenom du chercheur</label></td>
<td> <input value="' . $myrow[2] . '" name="prenom" id="prenom" type="text" /></td>
</tr>
<tr>
<td><label for="user">Identifiant </label></td>
<td><input value="' . $myrow[1] . '" name="user" id="user" type="text" /></td>
</tr>
<tr>
<td><label for="pass">Mot de passe</label></td>
<td><input value="' . $myrow[3] . '" name="pass" id="pass" type="password" /></td>
</tr>
<td><label for="mail">Email du chercheur</label></td>
<td><input value="' . $myrow[4] . '" name="mail" id="mail" type="email" /></td>
</tr>
<td><label for="grade">Grade</label></td>
<td> <input value="' . $myrow[5] . '" name="grade" id="grade" type="text" /></td>
</tr>
<tr>
<td><label for="naiss">Date de naissance</label></td>
<td><input value="' . $myrow[6] . '" name="naiss" id="naiss" type="date" /></td>
</tr>
<tr>
<td><label for="lieu">Lieu de naissance</label></td>
<td><input value="' . $myrow[7] . '" name="lieu" id="lieu" type="text" /></td>
</tr>
<tr>
<td><label for="divis">Division</label></td>
<td><input value="' . $myrow[8] . '" name="divis" id="divis" type="text" /></td>
</tr><tr><td> </td></tr>
<tr>
<td></td> <td><button name="submit2" id="submit2" type="submit" >Mettre à jour</button>
<button name="annuler" id="annuler" type="reset" >Réinitialiser</button></td>
</tr>
</table>';
if ((isset($_POST['submit2']))) {
$idf = pg_escape_string($_POST['user']);
$pass = pg_escape_string($_POST['pass']);
$name = pg_escape_string($_POST['nom']);
$pre = pg_escape_string($_POST['prenom']);
$mail = pg_escape_string($_POST['mail']);
$naissance = pg_escape_string($_POST['naiss']);
$lieu = pg_escape_string($_POST['lieu']);
$division = pg_escape_string($_POST['divis']);
$gr = pg_escape_string($_POST['grade']);
$result = pg_query($conn, "UPDATE chercheur SET nomcher='" . $name . "' and
precher='" . $pre . "' and passcher='" . $pass . "' and mailcher='" . $mail . "' and naisscher=date('" . $naissance . "')
and lieucher='" . $lieu . "' and divicher='" . $division . "'and gradcher='" . $gr . "'
where idfcher='" . $idf . "';");
if (!$result) {
$errormessage = pg_last_error();
echo "Error with query: " . $errormessage;
exit();
} else {
echo "mise à jour avec succès";
}
}
}
}
pg_free_result($result);
pg_close();
?>