src/Wallabag/CoreBundle/Form/DataTransformer/StringToListTransformer.php

   1 <?php
   2
   3 namespace Wallabag\CoreBundle\Form\DataTransformer;
   4
   5 use Symfony\Component\Form\DataTransformerInterface;
   6
   7 /**
   8  * Transforms a comma-separated list to a proper PHP array.
   9  * Example: the string "foo, bar" will become the array ["foo", "bar"].
  10  */
  11 class StringToListTransformer implements DataTransformerInterface
  12 {
  13     /**
  14      * @var string
  15      */
  16     private $separator;
  17
  18     /**
  19      * @param string $separator The separator used in the list
  20      */
  21     public function __construct($separator = ',')
  22     {
  23         $this->separator = $separator;
  24     }
  25
  26     /**
  27      * Transforms a list to a string.
  28      *
  29      * @param array|null $list
  30      *
  31      * @return string
  32      */
  33     public function transform($list)
  34     {
  35         if (null === $list) {
  36             return '';
  37         }
  38
  39         return implode($this->separator, $list);
  40     }
  41
  42     /**
  43      * Transforms a string to a list.
  44      *
  45      * @param string $string
  46      *
  47      * @return array|null
  48      */
  49     public function reverseTransform($string)
  50     {
  51         if (null === $string) {
  52             return;
  53         }
  54
  55         return array_values(array_filter(array_map('trim', explode($this->separator, $string))));
  56     }
  57 }