vendor/doctrine/collections/lib/Doctrine/Common/Collections/Expr/ClosureExpressionVisitor.php

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<?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. For more information, see
 * <http://www.doctrine-project.org>.
 */

namespace Doctrine\Common\Collections\Expr;

/**
 * Walks an expression graph and turns it into a PHP closure.
 *
 * This closure can be used with {@Collection#filter()} and is used internally
 * by {@ArrayCollection#select()}.
 *
 * @author Benjamin Eberlei <kontakt@beberlei.de>
 * @since  2.3
 */
class ClosureExpressionVisitor extends ExpressionVisitor
{
    /**
     * Accesses the field of a given object. This field has to be public
     * directly or indirectly (through an accessor get*, is*, or a magic
     * method, __get, __call).
     *
     * @param object $object
     * @param string $field
     *
     * @return mixed
     */
    public static function getObjectFieldValue($object, $field)
    {
        if (is_array($object)) {
            return $object[$field];
        }

        $accessors = array('get', 'is');

        foreach ($accessors as $accessor) {
            $accessor .= $field;

            if ( ! method_exists($object, $accessor)) {
                continue;
            }

            return $object->$accessor();
        }