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EDIT :: FileFormField.php

<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\DomCrawler\Field;

/**
 * FileFormField represents a file form field (an HTML file input tag).
 *
 * @author Fabien Potencier <fabien@symfony.com>
 *
 * @api
 */
class FileFormField extends FormField
{
    /**
     * Sets the PHP error code associated with the field.
     *
     * @param integer $error The error code (one of UPLOAD_ERR_INI_SIZE, UPLOAD_ERR_FORM_SIZE, UPLOAD_ERR_PARTIAL, UPLOAD_ERR_NO_FILE, UPLOAD_ERR_NO_TMP_DIR, UPLOAD_ERR_CANT_WRITE, or UPLOAD_ERR_EXTENSION)
     *
     * @throws \InvalidArgumentException When error code doesn't exist
     */
    public function setErrorCode($error)
    {
        $codes = array(UPLOAD_ERR_INI_SIZE, UPLOAD_ERR_FORM_SIZE, UPLOAD_ERR_PARTIAL, UPLOAD_ERR_NO_FILE, UPLOAD_ERR_NO_TMP_DIR, UPLOAD_ERR_CANT_WRITE, UPLOAD_ERR_EXTENSION);
        if (!in_array($error, $codes)) {
            throw new \InvalidArgumentException(sprintf('The error code %s is not valid.', $error));
        }

$this->value = array('name' => '', 'type' => '', 'tmp_name' => '', 'error' => $error, 'size' => 0);
    }

/**
     * Sets the value of the field.
     *
     * @param string $value The value of the field
     *
     * @api
     */
    public function upload($value)
    {
        $this->setValue($value);
    }

/**
     * Sets the value of the field.
     *
     * @param string $value The value of the field
     */
    public function setValue($value)
    {
        if (null !== $value && is_readable($value)) {
            $error = UPLOAD_ERR_OK;
            $size = filesize($value);
            $info = pathinfo($value);
            $name = $info['basename'];

// copy to a tmp location
            $tmp = sys_get_temp_dir().'/'.sha1(uniqid(mt_rand(), true));
            if (array_key_exists('extension', $info)) {
                $tmp .= '.'.$info['extension'];
            }
            if (is_file($tmp)) {
                unlink($tmp);
            }
            copy($value, $tmp);
            $value = $tmp;
        } else {
            $error = UPLOAD_ERR_NO_FILE;
            $size = 0;
            $name = '';
            $value = '';
        }

$this->value = array('name' => $name, 'type' => '', 'tmp_name' => $value, 'error' => $error, 'size' => $size);
    }

/**
     * Sets path to the file as string for simulating HTTP request
     *
     * @param string $path The path to the file
     */
    public function setFilePath($path)
    {
        parent::setValue($path);
    }

/**
     * Initializes the form field.
     *
     * @throws \LogicException When node type is incorrect
     */
    protected function initialize()
    {
        if ('input' != $this->node->nodeName) {
            throw new \LogicException(sprintf('A FileFormField can only be created from an input tag (%s given).', $this->node->nodeName));
        }

if ('file' != $this->node->getAttribute('type')) {
            throw new \LogicException(sprintf('A FileFormField can only be created from an input tag with a type of file (given type is %s).', $this->node->getAttribute('type')));
        }

$this->setValue(null);
    }
}

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EDIT :: FileFormField.php