<?php
//var_dump($_POST['data']) ;
$value = $_POST['data'] ; 

foreach($value as $cle => $valeur)
{   

$sql = 'INSERT INTO agenda SET
code_s = "'.mysql_real_escape_string($_POST['data[][code_s]']).'",
date = "'.mysql_real_escape_string($_POST['data[][date]']).'", 
libelle = "'.mysql_real_escape_string($_POST['data[][libelle]']).'",
action = "'.mysql_real_escape_string($_POST['data[][libelle]']).'"';

}
?>

$monTableau = array(...);
foreach($monTableau as $cle => $valeur)

<?php
$values = array();
foreach( $data AS $_POST['data'] ) {
    $values[] = '('.implode(',', $data).')';
}
$sql = "INSERT INTO agenda (code_s, date, libelle, action) VALUES ".implode(',', $values);
?>

<?php
$values = array();
foreach( $data AS $_POST['data'] ) {
    $values[] = '('.implode(',', $data).')';
}
$sql = "INSERT INTO agenda (code_s, date, libelle, action) VALUES ".implode(',', $values['code_s'], $values['libelle'], $values['action'], $values['date']);
?>

<?PHP
$code_s  =  $_POST['code_s']($i];
$titre     = $_POST['titre']($i];
$action  = $_POST['action']($i];
$libelle  = $_POST['libelle']($i];
$date    = $_POST['date']($i];

while (isset($code_s)) { 

INSERT INTO ...
}

?>

<?php
 
$sql = "SELECT * FROM scenarii where code_s='".mysql_real_escape_string($_POST['code_s'])."'";
$qry = mysql_query($sql) or die(__LINE__.mysql_error().$sql);
 
$get_date = function($data_jours) {
   $today = new DateTime();
   $today->setTime(0, 0);
   $jours = (isset($_POST['jours']) && ctype_digit($_POST['jours'])) ? $_POST['jours'] : 0;
   if (isset($_POST['submit']) && ($_POST['submit'] === 'moins')) {
      $jours = -$jours;
   }
   $nb       = $data_jours + $jours;
   $func     = ($nb < 0) ? 'sub' : 'add';
   $interval = new DateInterval("P{$nb}D");
   return $today->$func($interval)->format('d-m-Y');
};
$i = -1; // index des enregistrements
?>
<table cellpadding="5" cellspacing="5">
   <tr>
      <td><strong>CODE SCENARIO</strong></td>
      <td><strong>LIBELLE</strong></td>
      <td><strong>ACTION</strong></td>
      <td><strong>DESCRIPTION</strong></td>
      <td><strong>DATE</strong></td>
   </tr>
   <form action="<?php echo (isset($_POST['go'])) ? 'go.php' : '#'; ?>" method="post">
      <input type="hidden" name="liasse" value="<?php echo $_POST['liasse']; ?>"/>
      <?php while($row = mysql_fetch_assoc($qry)): ?>
      <tr>
         <td><input name="data[<?php echo ++$i; ?>][code_s]" type="text" value="<?php echo $row['code_s'];?>" size="10"></td>
         <td><input name="data[<?php echo $i; ?>][titre]" type="text" value="<?php echo $row['titre']; ?>" size="45"></td>
         <td><input name="data[<?php echo $i; ?>][action]" type="text" value="<?php echo $row['action']; ?>" size="15"></td>
         <td><input name="data[<?php echo $i; ?>][libelle]" type="text" value="<?php echo $row['libelle']; ?>" size="55"></td>
         <td><input type="text" name="data[<?php echo $i; ?>][date]" value="<?php echo $get_date($row['jour']); ?>" size="12"></td>
      </tr>
      <?php endwhile; ?>
      <p>
         <strong>Décalage des date </strong>
         <table width="150" border="0" cellspacing="0" cellpadding="0">
            <tr>
               <td align="center" bgcolor="#FFFF99"><input type="hidden" name="code_s" value="<?php echo $_POST['code_s']; ?>">
                  <input type="image" src="images/minus_remove_green.png" width="22" height="22" name="submit"  value="moins" />
                  <input name="jours" type="text" value="" size="5" />
                  <input type="image" src="images/plus_add_green.png" width="22" height="22" name="submit" value="plus" />
               </td>
            </tr>
         </table>
      </p>
      <p align="right"><input type="submit" name="go" value="go" width="28" height="28"></p>
   </form>
</table>

<?php //var_dump($_POST['tableau'])  ;
while (isset($_POST['$tableau'])) { echo $_POST['$tableau'] ; } ?>

<?php //var_dump($_POST['tableau'])  ;
while (isset($_POST['tableau'])) { echo $_POST['tableau'] ; } ?>