根据条件，如何使下拉列表单选或多选？

I had a requirement where in an employee list dropdown given, if selectMultiple is set, the dropdown should allow multiple selects, and if selectMultiple is not set, it shouldn't.

<select name="employeeList[]" id="employeeList" class="form-
control" multiple="<?=$selectMultiple?>">
    <?php
    foreach($employeeList as $employee) {

        echo "<option value='" . $employee->$employeeId . "'>" . 
        $employee->employeeName . "</option>";

    }    
    ?>
</select>

It's a phtml file, and $selectMultiple is passed from a controller(as in Phalcon). I have tried something like passing, $selectMultiple ="multiple", so the code will look like

<select name="employeeList[]" id="employeeList" class="form-control" multiple="multiple">

and $selectMultiple="" for the single select case.

<select name="employeeList[]" id="employeeList" class="form-control" multiple="">

But the very presence of multiple attribute itself makes the dropdown list elligible for multiselect.

In short, in either cases, it triggers multiselect regardless of the condition. Please help.

You can simply write your code like

You need to pass $selectMultiple = "multiple" or $selectMultiple = ''

<select name="employeeList[]" id="employeeList" class="form-control" <? echo !empty($selectMultiple) ? $selectMultiple : '' ?>>
<?php
foreach($employeeList as $employee) {

    echo "<option value='" . $employee->$employeeId . "'>" . 
    $employee->employeeName . "</option>";

}    
?>

I tried introducing a new variable "chooseId" to get rid of the multiple attribute and hence worked! Modified the select tag to,

<select name="employeeList[]" id="employeeList" class="form-control"
<?php if ($chooseId== 1) { ?> multiple="multiple" <?php } ?>>
<?php
  foreach($employeeList as $employee) {

    echo "<option value='" . $employee->$employeeId . "'>" . 
    $employee->employeeName . "</option>";

}    
?>
</select>

Now the code recognises the multiple attribute and enables multiselect only when chooseId is 1, otherwise single select works normally.