TrimFilter.php

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<?php
namespace TYPO3\CMS\Form\Filter;

class TrimFilter implements \TYPO3\CMS\Form\Filter\FilterInterface {

    protected $characterList;

    public function __construct(array $arguments = array()) {
        $this->setCharacterList($arguments['characterList']);
    }

    public function setCharacterList($characterList) {
        $this->characterList = $characterList;
        return $this;
    }

    public function filter($value) {
        if ($this->characterList === NULL) {
            return trim((string) $value);
        } else {
            return trim((string) $value, $this->characterList);
        }
    }

}