Question

I want to store variables into a while loop for my mysqli:fetch() statement, problem is that I think I am writing the code incorrectly. Especially for the variable $dataArraySession, can anybody look at code below and state what is the correct way in writing the code below:

          $sessionquery = "
             SELECT SessionId, SessionDate, SessionTime, ModuleId
             FROM Session
             WHERE
             (ModuleId = ?)
             ORDER BY SessionDate, SessionTime 
            ";

$sessionqrystmt=$mysqli->prepare($sessionquery);
// You only need to call bind_param once
$sessionqrystmt->bind_param("s",$_POST['modulesDrop']);
// get result and assign variables (prefix with db)

$sessionqrystmt->execute(); 

$sessionqrystmt->bind_result($dbSessionId,$dbSessionDate,$dbSessionTime, $dbModuleId);

 $sessionqrystmt->store_result();

$sessionnum = $sessionqrystmt->num_rows();   

    $dataArraySession = array();

 while ( $sessionqrystmt->fetch() ) { 

 $dataArraySession[$dbModuleId]['Sessions'][$dbSessionId]['SessionDate'] = $dbSessoonDate['SessionTime'] = $dbSessionTime; 

}

foreach ($dataArraySession as $sessionId => $sessionData) {

   $sessionHTML = ""; 
   $sessionHTML .= '<select name="session" id="sessionsDrop">'.PHP_EOL;
   $sessionHTML .= '<option value="">Please Select</option>'.PHP_EOL;           
   $sessionHTML .= "<option value='$sessionId'>" . $sessionId . " - " . $sessionData['SessionDate']. " - " . $sessionData['SessionTime'] ."</option>".PHP_EOL;        
   $sessionHTML .= '</select>';
        }


 if ($sessionnum > 0) {

 ?>

     <form action="<?php echo htmlentities($_SERVER['PHP_SELF']); ?>" method="post">
     <p>Sessions: <?php echo $sessionHTML; ?><input id="sessionSubmit" type="submit" value="Submit" name="sesionsubmit" /></p>      
    </form>       

<?php

}

else {
 echo "<p>Sorry, You have No Sessions under this Module</p>";
}

?>

Answer 1

There are several errors in your code:

1. After

   $dataArraySession = array();
   

   , $dataArraySession is an array, that’s all. So assigning

   $dataArraySession[$dbModuleId]=something;
   

   is valid, but accessing/assigning

   $dataArraySession[$dbModuleId]["Sesssions"]
   

   (in your while-loop) is invalid, because $dataArraySession[$dbModuleId] is still undefined;

2. $dbSessionDate is a bound value from $sessionqrystmt->bind_result(), so it would probably be a string or a number, so

   ... = $dbSessionDate['SessionTime'] = ...
   

   is invalid, because it’s just a string, not an array;

3. In your output loop, you’re also echoing invalid variables.

   In your while-loop, $dataArraySession is defined as

   array(
     [module_id]s => array(
       'Sessions' => array (
         [session_id]s => array (
           'SessionDate' => _value_
         )
       )
     )
   )
   

   So with

   foreach ($dataArraySession as $sessionId => $sessionData)
   

   ,$sessionData is only at the level of 'Sessions' => array (..., thus $sessionData has only one key, 'Sessions', and both $sessionData['sessionDate'] and $sessionData['sessionTime'] are invalid.