Reading an array with impode and explode.

Donovan · Client Joined: Oct 07, 2003 Posts: 735 Location: Ohio

I have a project I am working on where I have a many to many relationship between Courses and Directors. Courses can have more than one Director and Directors can teach many Courses.

I am trying to address this by having a Director field in the Courses table where I house an array of Director_ID's.

This code works for adding Courses and selecting more that one Director.

Code:

echo "<tr><td bgcolor='$bgcolor2'>Course Director(s):</td>\n";
echo "<td><select name=\"Director[]\" size=\"4\" multiple\">";
$directorlist = "SELECT Name_Last, Name_First, Director_ID FROM ".$prefix."_directors ORDER BY Name_Last;";
$result = $db->sql_query($directorlist);
while ( $row = $db->sql_fetchrow($result) ) {
$selected = "";
echo "<option value=\"" . $row['Director_ID'] . "\" $selected >" . $row['Name_First'] ." ". $row['Name_Last'] . "</option>";
}
echo "</select> (Control+Click) for multiple selections</td></tr>";

What I need now is a way to read this array when I EditCourse.php

I will have a list box that will list all Directors and any Director that already exist in the array will be selected in the list box.

So I need to explode the array and read the values and do a loop.

I selected * from Courses where Course_ID = '$CourseID' and read the value of Director

$Director = $info[Director];
$Director = explode(", ", $Director);

Now in my CourseEdit.php page I have this:

Code:

echo "<tr><td bgcolor='$bgcolor2'>Course Director(s):</td>\n";
echo "<td><select name=\"Director[]\" size=\"4\" multiple\">";
$directorlist = "SELECT Name_Last, Name_First, Director_ID FROM ".$prefix."_directors ORDER BY Name_Last;";
$result = $db->sql_query($directorlist);
while ( $row = $db->sql_fetchrow($result) ) {
$selected = "";
if ($row['Director'] == $Director) { $selected = "selected"; }
echo "<option value=\"" . $row['Director_ID'] . "\" $selected >" . $row['Name_First'] ." ". $row['Name_Last'] . "</option>";
}
echo "</select> (Control+Click) for multiple selections</td></tr>";

But I am missing the loop where I read the values of what is in the array.

How do I implements this? I know I'm "in the ballpark" but need an assist.

evaders99 · Posted: Thu Nov 15, 2007 5:38 pm

Code:

$directorlist = "SELECT Name_Last, Name_First, Director_ID FROM ".$prefix."_directors WHERE Director_ID IN (" . $info['Director'] . ") ORDER BY Name_Last;";

I use the IN command to select different values of Director_ID