php - enum list with pre-selected multiselect form -

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ok, new sort of thing , building small site work has profiles employees. working on way edit profiles, , when goes "edit" page, need of used values pre-selected.

when have dropdown based on enum list, works fine

example

<?php  $table_name = "agents"; $column_name = "assignedabc";  echo "<select name=\"$column_name\"><option>select one</option>"; $q = "select column_type information_schema.columns     table_name = '$table_name' , column_name = '$column_name'"; $r = mysqli_query($con, $q);  $row = mysqli_fetch_array($r);  $enumlist = explode(",", str_replace("'", "", substr($row['column_type'], 5, (strlen($row['column_type'])-6)))); foreach($enumlist $value)     echo '<option value="'.$value.'" '.(($value==$rows[assignedabc])?'selected="selected"':"").'>'.$value.'</option>';  echo "</select>"; ?>

the problem happens when there multi-select box. cannot pre-select all/any of existing selections database.

problem code

<?php  $table_name = "agents"; $column_name = "designations";  echo "<select multiple name='designations[]'>"; $q = "select column_type information_schema.columns     table_name = '$table_name' , column_name = '$column_name'"; $r = mysqli_query($con, $q);  $row = mysqli_fetch_array($r);  $enumlist = explode(",", str_replace("'", "", substr($row['column_type'], 5, (strlen($row['column_type'])-6)))); foreach($enumlist $value)      echo '<option value="'.$value.'" '.(($value==$rows[designations])?'selected="selected"':"").'>'.$value.'</option>';  echo "</select>"; ?>

any sort of help/guidance appreciated :)

edit/update

<?php  $table_name = "agents"; $column_name = "designations"; $csvstring = $rows['designations']; $des = explode(",", $csvstring);  echo "<select multiple name='designations[]'>"; $q = "select column_type information_schema.columns     table_name = '$table_name' , column_name = '$column_name'"; $r = mysqli_query($con, $q);  $row = mysqli_fetch_array($r);  $enumlist = explode(",", str_replace("'", "", substr($row['column_type'], 5, (strlen($row['column_type'])-6)))); foreach ($des $opt) foreach($enumlist $value)      echo '<option value="'.$value.'" '.(($value==$opt)?'selected="selected"':"").'>'.$value.'</option>';  echo "</select>";  ?>

everything pre-selecting now.. there repeats of every option in list now. 0_o

working code

<?php  $table_name = "agents"; $column_name = "designations"; $csvstring = $rows['designations']; $des = explode(",", $csvstring);  echo "<select multiple name='designations[]'>"; $q = "select column_type information_schema.columns     table_name = '$table_name' , column_name = '$column_name'"; $r = mysqli_query($con, $q);  $row = mysqli_fetch_array($r);  $enumlist = explode(",", str_replace("'", "", substr($row['column_type'], 5, (strlen($row['column_type'])-6))));  foreach($enumlist $value)      echo '<option value="'.$value.'" '.((in_array($value, $des))?'selected="selected"':"").'>'.$value.'</option>';  echo "</select>";  ?>


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