How to set selection in mulitiselect list box in cakephp - cakephp-2.0

Question

I want to set the multi selection to my multi list box.
I have two results in my view page.
$inr1 = 0;
$arr1 = array();
$str_arr = '';
foreach ($result as $rows){
$inr1 = $rows['Employees']['employee_id'];
$arr1[$inr1] = $rows['Employees']['first_name'].' '.$rows['Employees']['last_name'];
$str_arr = $str_arr.$inr1.',';
}
$str_arr = substr($str_arr,0,-1);
//print_r($arr1);
$inr = 0;
$arr = array();
foreach ($options as $option){
$inr = $option['Employee']['employee_id'];
$arr[$inr] = $option['Employee']['first_name'].' '.$option['Employee']['last_name'];
}
//print_r($arr);
echo $this->Form->input('emp_id_one', array( 'options' => array( $arr),
'empty' => '(choose one)',
'div'=>'formfield',
'error' => array( 'wrap' => 'div',
'class' => 'formerror'
),
'label' => 'Team Members',
'type' => 'select', 'multiple' => true,
'selected' => $arr1,
'style' => 'width:210px; height:125px;',
));
But the values in $arr1 not selected in the list box.
The $arr1 have the selected values.
The $arr have the options to the list.
The problem is that the selction is not working..There have no selection...
How can i do this?
If there is any problem in my code..?

Answer 1

Finally i solved my problem by chaing some code:
Add the one line of code after this $str_arr = substr($str_arr,0,-1);'.
That is....
$str_arr = substr($str_arr,0,-1);
$sel = explode(',',$str_arr);
Then change the name of variable as like this :
echo $this->Form->input('emp_id_one', array( 'options' => array( $arr),
'empty' => '(choose one)',
'div'=>'formfield',
'error' => array( 'wrap' => 'div',
'class' => 'formerror'
),
'label' => 'Team Members',
'type' => 'select', 'multiple' => true,
'selected' => $sel,
'style' => 'width:210px; height:125px;',
));
Now the values in $sel is selected in the multi list