Pass set of array into MySQL query as parameters - php

Question

what am trying to do here is get data from mysql generated checkboxes. The check boxes data are in array . So for all the check boxes selected I want to use each as a parameter in a query to get more info from another databastablee.
Sample Code Below
if (isset($_POST['submitCourseCode'])) {
//GET ARRAY FROM DATABASE GENERATED CHECKBOXES
$aElective = $_POST['electiveModules'];
foreach($aElective as $snode) {
echo "$snode <br />";
}
//PASSING EACH DATA FROM ARRAY INTO QUERY
$Query = "SELECT ID,title,credits
FROM module
WHERE ID IN('" . implode("', '", $aElective) ."')";
$Result = mysql_query($Query)
or die ("Query failed: " . mysql_error() . " Actual query: " . $Query);
while ($Row = mysql_fetch_array($Result)) {
$id = htmlentities($Row['ID']);
$title = htmlentities($Row['title']);
$credits = $Row['credits'];
echo "<ul>" . $id . " " . $title . " " . $credits . "</ul>";
}
}
var_dump($Query);
var_dump($Result);
var_dump($Row);
Screenshot of my result
Am guessing something is happening with my query probably because of the implode function but everything seems fine in my query.Any suggestions on what am doing wrong?

Answer 1

You need to trim array elements using array_map('trim', $aElective) as:
$Query = "SELECT ID,title,credits
FROM module
WHERE ID IN('" . implode("','", array_map('trim', $aElective)) ."')";

Answer 2

There is a problem with white spaces before your IDs in IN clause.
Try to add a str_replace() call
$Query = "SELECT ID,title,credits
FROM module
WHERE ID IN('" . str_replace(" ", "", implode("', '", $aElective)) ."')";