select variables extra

src/views/extra/edit.blade.php

@@ -14,6 +14,13 @@
   </li>  
 @endsection
 @section('content')
+@php
+  $var=explode(",",$extra->values);
+  $value_array = [];
+  foreach($var as $result) {
+      $value_array[$result] = $result;
+  }
+@endphp
 <div class='row'>
   <div class='col-md-12'>
     <div class='box'>

src/views/extra/fields.blade.php

-@php
-	$var=explode(",",$extra->values);
-	$value_array = [];
-	foreach($var as $result) {
-    	$value_array[$result] = $result;
-	}
-@endphp
 <div class="form-group">
 	{!! Form::label('variable', 'Variable') !!}
 	{!! Form::select('variable', $variables, null, ["class"=>"form-control", "required"=>"required", "placeholder"=>"Elija una variable"]) !!}
@@ -23,7 +16,7 @@
 <div class="form-group" id="select-values" style="display: none;">
 	{!! Form::label('values', 'Valores del select: ', ['class'=>'control-label'])!!}
 	{{ isset($extra->values) ? $extra->values : null }}
-	{!! Form::select('values[]', $value_array, isset($extra->values) ? explode(",",$extra->values) : null, ["id"=>"values", "multiple"=>"multiple", "style"=>"width:100%;"]) !!}
+	{!! Form::select('values[]', isset($value_array) ? $value_array : [] , isset($extra->values) ? explode(",",$extra->values) : null, ["id"=>"values", "multiple"=>"multiple", "style"=>"width:100%;"]) !!}
 </div>
 
 <div class="form-group">