<?php
/*
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software consists of voluntary contributions made by many individuals
 * and is licensed under the MIT license.
 */
namespace DocHeader\Filter;

/**
 * @author  Jefersson Nathan <malukenho@phpse.net>
 * @license MIT
 */
final class Filter
{
    /**
     * @var string
     */
    private $docheader;

    private $defaultFilters = [
        CurrentYear::class,
    ];

    /**
     * @param string $docheader
     */
    public function __construct($docheader)
    {
        $this->docheader = $docheader;
    }

    /**
     * @return string
     */
    public function applyFilters()
    {
        array_map(
            function ($filterName) {
                $this->docheader = (new $filterName)->__invoke($this->docheader);
            },
            $this->defaultFilters
        );

        return $this->docheader;
    }
}

<?php
/*
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software consists of voluntary contributions made by many individuals
 * and is licensed under the MIT license.
 */
namespace DocHeader\Filter;

/**
 * @author  Jefersson Nathan <malukenho@phpse.net>
 * @license MIT
 */
final class Filter
{
    /**
     * @var string
     */
    private $docheader;

    private $defaultFilters = [
        CurrentYear::class,
    ];

    /**
     * @param string $docheader
     */
    public function __construct($docheader)
    {
        $this->docheader = $docheader;
    }

    /**
     * @return string
     */
    public function applyFilters()
    {
        $docheader = $this->docheader;

        foreach ($this->defaultFilters as $filterName) {
            $docheader = (new $filterName)->__invoke($docheader);
        }

        return $docheader;
    }
}

Change weird `array_map` by `foreach`
Change weird `array_map` by `foreach`
